SAE AS 620F-2007-USB迷|专注于互联网分享

2024年2月24日发(作者：董文林)

AEROSPACE

STANDARD

AS620

REV.

Issued 1964-04

Revised 2007-02

Superseding AS620E

Hose Assemblies, Convoluted Polytetrafluoroethylene Metallic

Reinforced, High Temperature, Medium Pressure, Aircraft

RATIONALE

Revised standard to agree with hose assembly manufacturer product designs and added -32 size.

1. SCOPE

This SAE Aerospace Standard (AS) defines the requirements for a convoluted polytetrafluoroethylene (PTFE) lined,

metallic reinforced, hose assembly suitable for use in aircraft fluid systems at temperatures of -65 to 400 °F and at

operating pressures per Table 1.

TABLE 1 - PHYSICAL REQUIREMENTS OF HOSE ASSEMBLIES AND WEIGHT OF HOSE

Burst

Pressure

Hose

Operating

Proof

Room

High

Weight

Pressure

PressureTemperatureTemperatureHose

Max1

Max

Min

lb/in

Size

psi

04 .010 1000 2000 4000 2800

06 .010 1000 2000 4000 2800

08 .022 1000 2000 4000 2800

10 .020 1000 1800 3600 2500

12 .027 1000 1800 3600 2500

16 .040 1000 1800 3600 2500

20 .055 1000 1800 3600 2500

24 .060 750 1500 3000 2100

32 .090 250 500 1000 700

40 .110 100 200 400 280

48 .145 100 200 400 280

64 .200 100 200 400 280

1 Hose weight shall be determined on a minimum length of 12 in.

Bend RadiusAt Inside of

Bend Min

1.25

2.25

2.88

3.00

3.75

5.00

6.25

7.50

10.00

12.50

15.00

24.00

__________________________________________________________________________________________________________________________________________

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SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.

photocopying, recording, or otherwise, without the prior written permission of SAE.

TO PLACE A DOCUMENT ORDER:

SAE WEB ADDRESS:

Tel: 877-606-7323 (inside USA and Canada)

Tel: 724-776-4970 (outside USA)

Fax: 724-776-0790

Email: CustomerService@

SAE

1.1 Types

1.1.1

AS620 Revision F - 2 -

Hose assemblies furnished under this document may be of two types:

Type I - Non-conductive Inner Tube

Type II - Conductive Inner Tube

1.1.2 Hose assemblies furnished under this document may be of the following classes. If no class is defined then

Class 1 shall prevail.

Class 1 - Liquid Proof Test

Class 2 - Liquid and Pneumatic Proof Test

2. REFERENCES

2.1 Applicable Documents

The following publications form a part of this specification to the extent specified herein. The latest issue of SAE

publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of purchase

order. In the event of conflict between the text of this specification and references cited herein, the text of this

specification takes precedence. Nothing in this specification, however, supersedes applicable laws and regulations

unless a specific exemption is obtained.

2.1.1 SAE Publications

Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside

USA and Canada) or 724-776-4970 (outside USA), .

AMS 2700

AMS 5556

AMS 5557

AMS 5567

AMS 5570

AMS 5571

AMS 5575

AMS 5636

AMS 5637

AMS 5639

Passivation of Corrosion-Resistant Steels

Steel, Corrosion and Heat Resistant, Seamless or Welded Tubing, 18Cr 11Ni 0.70(Cb+Ta) (SAE

30347), Hydraulic, Solution Heat Treated

Steel Tubing, Seamless and Welded, Corrosion and Heat Resistant, 18.5Cr 10.5Ni 0.40Ti (SAE

30321), Hydraulic, Solution Heat Treated

Steel Tubing, Seamless or Welded, Corrosion Resistant, 19Cr 10Ni (SAE 30304), Hydraulic,

Annealed

Steel, Corrosion and Heat Resistant, Seamless Tubing, 18Cr 11Ni 0.40Ti (SAE 30321), Solution Heat

Treated

Steel, Corrosion and Heat Resistant, Seamless Tubing, 18Cr 10.5Ni 0.70(Cb+Ta) (SAE 30347),

Solution Heat Treated

Steel, Corrosion and Heat Resistant, Welded Tubing, 18Cr 10.5Ni 0.70(Cb+Ta) (SAE 30347),

Solution Heat Treated

Steel, Corrosion Resistant, Bars and Wire, 18Cr 9.0Ni (SAE 30302) Solution Heat Treated and Cold

Drawn, 100 ksi Tensile Strength

Steel, Corrosion Resistant, Bars and Wire, 18Cr 9.0Ni (SAE 30302) Solution Heat Treated and Cold

Drawn, 125 ksi Tensile Strength

Steel Bars, Wire, Forgings, Tubing and Rings, Corrosion Resistant, 19Cr 10Ni (SAE 30304), Solution

Heat Treated

SAE

AMS 5643

AMS 5644

AMS 5645

AMS 5646

AMS 5647

AMS 5656

AMS 5659

AMS 5685

AMS 5688

AMS 5689

AMS 5690

AMS 5697

AMS-QQ-P-35 Passivation

AMS-QQ-S-763

AS150

AS611

ARP908

AS1055

ARP1835

AS2078

AS33514

AS4395

AS4658

AS4659

AS4700

AS620 Revision F - 3 -

Steel, Corrosion Resistant, Bars, Wire, Forgings, Tubing and Rings, 16Cr 4.0Ni 0.30(Cb+Ta) 4.0Cu

(SAE 17-4PH), Solution Heat Treated, Precipitation Hardenable

Steel Bars and Forgings, Corrosion Resistant, 17Cr 7.0Ni 1.0Al (SAE 17-4PH)

Steel, Corrosion and Heat Resistant, Bars, Wire, Forgings, Tubing and Rings, 18Cr 10Ni 0.40Ti (SAE

30321), Solution Heat Treated

Steel, Corrosion and Heat Resistant, Bars, Wire, Forgings, Tubing and Rings, 18Cr 11Ni

0.60(Cb+Ta) (SAE 30347), Solution Heat Treated

Steel, Corrosion-Resistant, Bars, Wire, Forgings, Tubing and Rings 19Cr 9.5Ni Solution Heat Treated

Steel, Corrosion Resistant, Bars, Wire, Forgings, Extrusions and Rings, 9.0Mn 20Cr 6.5Ni 0.27N

(SAE 21-6-9), Solution Heat Treated

Steel, Corrosion Resistant, Bars, Wire, Forgings, Rings and Extrusions, 15Cr 4.5Ni 0.30Cb 3.5Cu

(SAE 15-5PH), Consumable Electrode Melted, Solution Heat Treated, Precipitation Hardenable

Steel, Corrosion Resistant, Safety Wire, 18Cr 11.5Ni (SAE 30305) Solution Heat Treated, Cold

Finished

Steel, Corrosion Resistant, Wire, 18Cr 9.0Ni (SAE 30302) Spring Temper

Steel, Corrosion and Heat Resistant, Wire 18Cr 10.5Ni 0.40Ti (SAE 30321), Solution Heat Treated

Steel, Corrosion and Heat Resistant, Wire 17Cr 12Ni 2.5Mo (SAE 30316), Solution Heat Treated

Steel, Corrosion Resistant, Wire 19Cr 9.5Ni (SAE 30304), Solution Heat Treated

Treatments for Corrosion-Resistant Steels

Steel Bars, Wire Shapes, and Forgings, Corrosion-Resisting

Hose Assembly, Type Classifications of, Basic Performance and Fire Resistance

Hose Assembly and Tubing, Polytetrafluoroethylene, Cleaning Methods

Hose and Tube Fitting - Installation and Qualification Test Torque

Fire Testing of Flexible Hose, Tube Assemblies, Coils, Fittings and Similar System Components

Preparation for Delivery General Requirements for Hose Assemblies

Test Methods, Hose Assemblies, Polytetrafluoroethylene (PTFE)

Fitting End, Standard Dimensions for Flareless Tube Connection and Gasket Seal

End Fitting - Flared Tubing Connections, Design Standard

Fitting End, External Thread, Short Flareless

Fitting End, Bulkhead, External Thread, Short Flareless

Installation Procedures and Torques for Short Flareless Fittings

SAE

AS4703

AS7003

AS7112

AS8879

AS620 Revision F

Fitting End, Acorn, Short Flareless

National Aerospace and Defense Contractors Accreditation Program (NADCAP)

- 4 -

National Aerospace and Defense Contractors Accreditation Program Requirements for Fluid System

Components

Screw Threads, Controlled Radius Root with Increased Minor Diameter; General Specification for

2.1.2 ASTM Publications

Available from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, Tel: 610-832-9585,

ASTM A 262

ASTM A 313

ASTM A 580

ASTM D 471

2.1.3

Standard Recommended Practices for Detecting Susceptibility to Intergranular Attack in Stainless

Steel

Standard Specification for Stainless Steel Spring Wire

Specification for Stainless and Heat Resisting Steel Wire

Standard Test Fluids, Hydrocarbons

U.S. Government Publications

Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue,

Philadelphia, PA 19111-5094, Tel: 215-697-6257, /quicksearch/.

TT-I-735 Isopropyl Alcohol

MIL-DTL-5624

MIL-HDBK-831

Turbine Fuel, Aviation, Grades JP-4 and JP-5

Preparation of Test Reports

MIL-PRF-680 Degreasing Solvent

MIL-PRF-5606

MIL-PRF-7808

MIL-PRF-83282

MIL-PRF-87257

Hydraulic Fluid, Petroleum Based, Aircraft, Missile and Ordnance

Lubricating Oil, Aircraft Turbine Engine, Synthetic Base

Hydraulic Fluid, Fire Resistant Synthetic Hydrocarbon Base, Aircraft

Hydraulic Fluid, Fire Resistant, Low Temperature, Synthetic Hydrocarbon Base, Aircraft and Missile

MIL-STD-130 Identification Marking of U.S. Military Property

2.1.4 NAS Standards

Available from Aerospace Industries Association, 1000 Wilson Boulevard, Suite 1700, Arlington, VA 22209-3928, Tel:

703-358-1000, .

NAS 847

NAS 1760

Caps and Plugs, Protective, Dust and Moisture Seal

Fitting End, Flareless Acorn, Standard Dimensions for

SAE

2.1.5 ASME Publications

AS620 Revision F - 5 -

Available from ASME, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, .

ASME B46.1

ASME Y14.100

Surface Texture

Engineering Drawing Practices

2.1.6 PRI Publications

Available from Performance Review Institute, 161 Thornhill Road, Warrendale, PA 15086-7527, Tel: 724-772-1616,

PD2001

PD2101

2.2

Qualified Product Management Council Procedures for Qualified Products Group

Aerospace Quality Assurance, Product Standard, Qualification Procedures, Fluid Systems

Hose Assembly Procurement Specifications

Refer to AS620SUP1 for a listing of applicable hose assembly procurement standards applicable to this document.

3. TECHNICAL REQUIREMENTS

3.1 Qualification

Hose assemblies supplied in accordance with this document shall be representative of products which have been

subjected to and which have successfully passed the qualification tests specified in this standard.

3.1.1 Manufacturer Qualification

A manufacturer producing a product in conformance to this procurement specification shall be accredited in accordance

with the requirements of PD2101, AS7003 and AS7112, and shall be listed in a Performance Review Institute (PRI)

Qualified Manufacturers List (QML).

3.1.2 Product Qualification

All products shall conform to the requirements of this procurement specification and shall be approved in accordance with

the requirements of PD2001, and PD2101, for listing in a Performance Review Institute (PRI) Qualified Parts List (QPL).

3.2 Material

The hose assembly materials shall be uniform in quality, free from defects, consistent with good manufacturing practice

and shall conform to applicable specifications and the requirements specified herein. All materials not specifically

described herein shall be of the highest quality and suitable for the purpose intended.

SAE

3.2.1 Metals

AS620 Revision F - 6 -

Metals used in the hose and fittings shall be corrosion-resistant and shall conform to the following specifications:

a. Bars and Forgings:

(1) AMS-QQ-S-763 Class 302 - Cond. A or Cond. B (AMS 5636 or AMS 5637)

(2) AMS-QQ-S-763 Class 304 - Cond. A or Cond. B (AMS 5639)

(3) AMS-QQ-S-763 Class 304L - Cond. A or Cond. B (AMS 5647)

(4) AMS-QQ-S-763 Class 321 - Cond. A (AMS 5645)

(5) AMS-QQ-S-763 Class 347 - Cond. A (AMS 5646)

(6) AMS 5643 17-4PH

(7) AMS 5644 17-7PH

(8) AMS 5656 21-6-9

(9) AMS 5659 15-5PH

b. Tubing:

(1) AMS 5556 Type 1 or Type 2 Stainless Steel Tubing, 347

(2) AMS 5557 Type 1 or Type 2 Stainless Steel Tubing, 321

(3) AMS 5567 Type 1 or Type 2 Stainless Steel Tubing, 304

(4) AMS 5570 Seamless Stainless Steel Tubing, 321

(5) AMS 5571 Seamless Stainless Steel Tubing, 347

(6) AMS 5575 Welded Stainless Steel Tubing, 347

c. Wire:

(1) ASTM A 580/A 313 Comp. 302 (AMS 5688)

(2) ASTM A 580/A 313 Comp. 304 (AMS 5697)

(3) ASTM A 580/A 313 Comp. 316 (AMS 5690)

(4) ASTM A 580/A 313 Comp. 321 (AMS 5689)

(5) AMS 5685 305

SAE

3.3 Construction

AS620 Revision F - 7 -

The hose assembly shall consist of a convoluted polytetrafluoroethylene inner tube, which may be covered with

convoluted woven glass cloth and/or other suitable materials, corrosion-resistant steel- wire reinforcement, and corrosion-resistant steel end fittings as required to meet the construction and performance requirements of this document and as

required for its intended use.

3.3.1 Inner Tube

The inner tube shall be of a convoluted construction of virgin polytetrafluoroethylene resin designed to promote easy

bending. It shall be free from pitting or projections on the inner surface. Additives may be included in the compound from

which the tube is fabricated.

3.3.2 Reinforcement

The reinforcement shall consist of corrosion-resistant steel wires conforming to the applicable specifications listed in

3.2.1. The wires shall be so arranged over the inner tube as to provide sufficient strength to ensure conformance with the

requirements specified herein. Broken reinforcing wires shall be cause for rejection. Crossed-over reinforcing wires shall

not be cause for rejection of the hose assembly.

3.3.3 Interlayers

Interlayers, if used, shall be of a suitable material and shall be resistant to all fluids with which the hose may come in

contact during normal service. They shall be capable of withstanding temperatures of -65 to 400 °F and shall not extrude

through the outer braid during testing or in service.

3.3.4 Fittings

All fittings shall be permanently attached and proven to meet the requirements herein. Standard hose assemblies shall

have flared fittings to mate with AS4395, flareless fittings according to NAS 1760 to mate with AS33514 or AS4375, or

short flareless fittings in accordance to AS4703 to mate with AS4658 or AS4659, in accordance with applicable

documents (see 2.1). Fitting hex portions shall fit standard wrench openings.

3.3.4.1 Straight Fittings

Fittings shall be of one-piece construction. Weld or braze joints must not be located in the fluid paths, except welded and

redrawn tubing per AMS 5567, AMS 5556 or AMS 5557 may be used.

3.3.4.2 Other Fittings

Other fittings, including elbow fittings, shall be of one piece construction to the maximum extent possible. When one

piece construction is not used, the joints shall be welded using either butt-weld or lap-weld design. For double elbow

assemblies, the elbows may be treated as non-standard.

3.3.4.3 End Fitting Collars (Sockets)

All end fitting collars (sockets) crimped or swaged, fabricated from Type 304 stainless steel are required to be capable of

passing an embrittlement test as specified in ASTM A 262 Practice E, prior to assembly to the nipple or swaging

operation. Sockets fabricated from stabilized austenitic steel (304L, 321 or 347) are acceptable without being subjected to

the embrittlement test.

SAE

3.3.4.4 Fitting Finish

3.3.4.4.1 Corrosion-Resistant Steel Parts

AS620 Revision F - 8 -

Unless otherwise specified, corrosion resistant steel fittings shall be passivated in accordance with AMS 2700 or AMS-QQ-P-35.

3.4 Dimensions

The hose assembly dimensions, except for length, shall be as specified in Figure 1 and Table 2.

/1/

/1/ Cross corners of nut, nipple hex or socket hex may exceed “D” dimensions

FIGURE 1 - HOSE AND FITTING DIMENSIONS

TABLE 2 - HOSE AND FITTING DIMENSIONS - INCH

Rigid

Tubing OD Fitting ID Hose ID Hose Wire Fitting OD

Hose Ref Min Min Braid OD Max

Size in A1 B C ± .032 D

04 .250 .132 .270 .445 .55

06 .375 .256 .355 .555 .68

08 .500 .345 .510 .755 .86

10 .625 .430 .600 .850 .95

12 .750 .635 .765 1.060 1.28

16 1.000 .835 .980 1.298 1.47

20 1.250 1.085 1.220 1.526 1.70

24 1.500 1.310 1.480 1.790 2.00

32 2.000 1.780 1.937 2.325 2.56

40 2.500 2.278 2.437 2.875 3.00

48 3.000 2.771 2.937 3.430 3.70

64 4.000 3.700 3.937 4.455 4.70

Hose assembly conformance to minimum specified inside diameter shall be

verified by passing the designated or larger spherical ball through the hose

assembly.

SAE

AS620 Revision F

TABLE 3 - MINIMUM INSPECTION BALL SIZE FOR HOSE ASSEMBLY1

Straight End

Fitting

.119

.230

.310

.387

.572

.752

.366

.540

.710

Elbow End

Fitting

.112

.218

.293

- 9 -

Hose

Size

20 .976 .922

24 1.179 1.114

32 1.602 1.513

40 2.050 1.936

48 2.494 2.355

64 3.330 3.145

Hose assembly conformance to minimum

specified inside diameter shall be verified by

passing the designated or larger spherical

ball through the hose assembly.

3.4.1 Hose Weight

Hose consisting of inner tube, reinforcement and interlayers as outlined in 3.3.1 through 3.3.3 shall not exceed the

maximum weights specified in Table 1.

3.5 Performance

The hose assembly shall meet the following performance requirements:

3.5.1 Proof Pressure

3.5.1.1

3.5.1.2

Class 1 hose assemblies shall withstand the proof pressure listed in Table 1 without malfunction or leakage

when tested with water in accordance with 4.6.2.1.

Class 2 hose assemblies shall meet the Class 1 proof pressure test requirement and shall withstand 25% of the

operating pressure listed in Table 1 without malfunction or leakage in excess of the normal effusion rate of one

bubble per minute for each inch of PTFE hose length plus one bubble per minute for each end fitting when

tested pneumatically in accordance with 4.6.2.2.

Elongation and Contraction 3.5.2

The hose assembly shall not change in length by more than +0.3 in or -0.1 in in 10 in of hose length, when subjected to

the operating pressure in Table 1 for a minimum of 5 min. The hose assembly shall be tested in accordance with 4.6.3.

SAE

3.5.3 Leakage

AS620 Revision F - 10 -

The hose assembly shall not leak (no external wetting) when subjected to two pressure cycles of 70% of minimum room

temperature burst pressure, when tested in accordance with 4.6.4.

3.5.4 Room Temperature Burst Pressure

The hose assembly shall not leak nor burst at any pressure below room temperature burst pressure specified in Table 1,

when tested in accordance with 4.6.5.

3.5.5 High Temperature Burst Pressure

The hose assembly shall not leak nor burst at any pressure below high temperature burst pressure specified in Table 1,

when tested at 400 °F in accordance with 4.6.6.

3.5.6 Oil Resistance

The hose assembly shall show no evidence of leakage when tested with oil conforming to MIL-PRF-7808 (or other oils

specified by the procuring activity) and with test fluid conforming to ASTM Reference Fuel B (70% Isooctane, 30%

Toluene) as defined in ASTM D 471, when tested in accordance with 4.6.7.

3.5.7 Fuel Resistance

The hose assembly shall show no evidence of leakage when pressurized with fluid conforming to MIL-DTL-5624 (JP4) at

Table 1 operating pressure. The test shall be conducted in accordance with 4.6.8.

3.5.8 Flexibility and Vacuum

A ball of the applicable diameter listed in Table 4 shall roll through the hose assembly from fitting to fitting after the hose

assembly has been maintained for a minimum of 4 h at 400 °F and the applicable vacuum listed in Table 4. Following

this, the hose assembly shall show no evidence of leakage nor permanent damage after being tested to the applicable

proof pressure specified in Table 1. Testing shall be conducted in accordance with 4.6.9.

TABLE 4 - VALUES FOR VACUUM TEST

Ball Size

MS19059

Dash No.

1008

1014

1017

1019

1626

1632

.406

.625

.812

Hose

Size

Negative Pressure

in Hg

Ball Size

.125

.250

.344

20 18

24 12

32 5

40 5

48 5

64 3

1639 1.062

TBD 1.281

4851 1.812

TBD 2.250

TBD 2.750

TBD 3.688

SAE

3.5.9 Pressure Surge

AS620 Revision F - 11 -

The hose assembly shall show no evidence of leakage from the hose or end fitting when subjected to 50,000 pressure

surges from 0-7.5% operating pressure to the full 100% operating pressure of Table 1, while maintained at 400 °F, when

tested in accordance with 4.6.10.

3.5.10 Electrical Conductivity (Type II only)

Hose assembly sizes up to -08 shall conduct a DC equal to or greater than 6 µA and sizes -10 and above a DC equal to

or greater than 12 µA with a test potential of 1000 V DC, when tested in accordance with 4.6.11.

3.5.11 Repetitive Assembly Torque

The fitting shall withstand repetitive assembly torque values specified in ARP908, or AS4700 for short flareless design,

when tested in accordance with 4.6.12.

3.6 Screw Threads

Coupling nut threads shall be in accordance with AS8879 (ISO 3161). Thread tolerance increase of 10% during

assembly or testing shall not be cause for rejection of the hose assembly.

3.7 Length Tolerance

Tolerances on hose assemblies shall be as follows:

+.250/-.125 in for lengths under 18 in

+.500/-.250 in for lengths from 18 to 36 in exclusive

+1.000/-.500 in for lengths from 36 to 50 in exclusive

+2%/-1% for lengths 50 in and over

3.8 Part Numbering of Interchangeable Parts

All parts having the same manufacturer’s part number shall be functionally and dimensionally interchangeable. The item

identification and part number requirement of MIL-STD-100 shall govern the manufacturer’s part numbers and changes

thereto.

3.9 Identification of Product

Equipment, assemblies and parts to be marked for identification in accordance with MIL-STD-130. The following special

marking shall be added:

3.9.1 Fittings

The manufacturer’s name and trademark shall be permanently marked on all end fittings.

SAE

3.9.2 Assembly

AS620 Revision F - 12 -

A permanent marking shall be applied on a fitting or on a permanent band, or bands, securely attached on the hose. The

band shall be no wider than 1 in and shall not impair the flexibility or the performance of the hose. Unless otherwise

specified, the marking on the fitting or band shall include the following information:

a. Assembly manufacturer’s name or trademark

b. CAGE code and complete hose assembly part number

c. Operating pressure in psi (as applicable)

d. Operating temperature “400 °F” (as applicable)

e. Pressure test symbol “PT”

f. Assembly Specification “AS620”

g. Date of hose assembly manufacture expressed in terms of month and year

h. Hose manufacturer’s CAGE code number (required only when hose manufacturer is different than hose assembly

manufacturer)

i. AS1055, Type and Class or AS150 and Type (when applicable)

3.10 Workmanship

The hose assembly, including all parts, shall be constructed and finished in a thoroughly workmanlike manner. All

surfaces shall be free from burrs. All sealing surfaces shall be smooth, except that the annular tool marks up to 100 µin

Ra per ASME B46.1 maximum will be acceptable.

3.10.1 Dimensions and Tolerances

All pertinent dimensions and tolerances, where interchangeability, operation and performance of the hose assembly may

be affected, shall be specified on all drawings.

3.10.2 Cleaning

All hose assemblies shall be free from oil, grease, dirt or other foreign materials, both internally and externally. Unless

otherwise specified, hose assemblies shall be cleaned to Class 0 of AS611.

4. QUALITY ASSURANCE PROVISIONS

4.1 Responsibility for Inspection

Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all

inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his/her own facilities

or any commercial laboratory acceptable to the procuring activity. The procuring activity reserves the right to perform any

of the inspections set forth in the specification, where such inspections are deemed necessary to assure supplies and

services conform to prescribed requirements.

SAE

4.2 Classification of Inspections

AS620 Revision F - 13 -

The examination and testing of hose assemblies shall be classified as:

a. Quality conformance inspections (see 4.3)

b. Qualification inspections (see 4.4)

4.3 Quality Conformance Inspections

Quality conformance inspections shall consist of the following tests:

a. Individual test (see 4.3.1)

b. Sampling test (see 4.3.2)

c. Periodic control test (see 4.3.3)

4.3.1 Individual Tests

Each hose assembly shall be subjected to the following tests:

a. Examination of product (see 4.6.1)

b. Proof pressure test (see 4.6.2)

4.3.2 Sampling Test

The following shall be performed on one hose assembly picked at random from each lot. A lot is defined as 500

assemblies of a given dash size.

a. X-ray or fluoroscope to determine proper fitting installation

b. Elongation and contraction test (see 4.6.3), then

c. Leakage test (see 4.6.4)

4.3.3 Periodic Control Test

A fuel resistance test (see 4.6.8) shall be performed on at least two assemblies for each test selected from each 5000

hose assemblies for each dash size, not necessarily manufactured during one continuous production run.

4.3.4 Rejection and Retest

When one item selected from a production run fails to meet the specifications, no items still on hand or later produced

shall be accepted until the extent and cause of failure are determined and corrective action, as necessary, taken.

4.3.4.1 Individual Tests May Continue

For operational reasons, the individual tests may be continued pending the investigation of a sampling or periodic control

test failure. Final acceptance of items on hand or produced later shall not be made until it is determined that items meet

the requirements on which the rejection was based.

SAE

4.4 Qualification Inspection

4.4.1 Qualification Testing

AS620 Revision F - 14 -

The qualification of hose assemblies shall consist of all the tests described in this specification. Unless otherwise

specified by the purchaser, qualification samples shall consist of the number of samples and lengths specified in Table 5

for each method of fitting attachment. The procedure shall be as specified in Table 6. The end fitting outlet design for the

samples shall have flared fittings to mate with AS4395, or flareless fittings in accordance to NAS1760 to mate with

AS33514, or AS4375, or short flareless fittings in accordance to AS4703 to mate with AS4568 or AS4569.

All specimens for each hose size are required for qualifying each of the methods of end fitting attachment and for each

method of end fitting construction, bent tube or forged. Simultaneous qualification of flared and flareless fittings may be

accomplished by having fittings on one hose end flared and flareless fittings on the other end.

If a supplier qualifies one end fitting outlet design, and at a later date desires to qualify another fitting outlet design, two

hose assemblies of each size to be qualified shall be subjected to the tests specified in 4.5.1.1.

TABLE 5 - TEST SAMPLES (FLARELESS FITTINGS) (CONTINUED)

Hose Sample

Size Part Number Numbers2 Quantity

04 AS1633-04-0180 1-7 7

AS1635-04-0180 8-11 4

06 AS1633-06-0180 1-7 7

AS1635-06-0180 8-11 4

08 AS1633-08-0180 1-7 7

AS1635-08-0180 8-11 4

10 AS1633-10-0180 1-7 7

AS1635-10-0180 8-11 4

12 AS1633-12-0180 1-7 7

AS1635-12-0180 8-11 4

16 AS1633-16-0180 1-7 7

AS1635-16-0180 8-11 4

20 AS1633-20-0180 1-4 4

3 AS1633-20-0200 5-7 3

AS1635-20-02001 8-11 4

24 AS1633-24-0180 1-4 4

3 AS1633-24-0250 5-7 3

AS1635-24-02501 8-11 4

32 AS1633-32-0180 1-4 4

3 AS1633-32-0310 5-7 3

AS1635-32-03101 8-11 4

40 AS1633-40-0180 1-4 4

3 AS1633-40-0380 5-7 3

AS1635-40-03801 8-11 4

48 AS1633-48-0180 1-4 4

3 AS1633-48-0450 5-7 3

AS1635-48-04501 8-11 4

SAE

AS620 Revision F - 15 -

TABLE 5 - TEST SAMPLES (FLARELESS FITTINGS)

(CONTINUED)

Hose Sample

Size Part Number Numbers2 Quantity

64 AS1633-64-0180 1-4 4

AS1633-64-06003 5-7 3

AS1635-64-06001 8-11 4

1 Assembly length required for pressure surge test.

2 See Table 6 for test sequence for each hose sample.

3 Assembly length for flexure and vacuum test.

4.4.2 Test Report, Test Samples and Data for the Procuring Activity

When the tests are conducted at a location other than the laboratory of the procuring activity, the following shall be

furnished to that activity:

a. Test report: The test report shall be in accordance with MIL-HDBK-831, which shall include a report of all tests and

outline description of the tests and conditions.

b. Test samples: The qualification test samples, when requested by the procuring activity.

c. Three sets of assembly and sub-assembly drawings. The assembly drawings shall have a cut- away section showing

all details in their normal assembly position and shall define all details and subassemblies.

d. List of sources of hose or hose components, including source’s name and product identification for inner tube, hose

and assembly.

NOTE: Log sheets, and recorded test data, shall remain on file at the source test facility and are not to be sent to the

procuring activity unless specifically requested.

4.4.3 Qualification Test Sequence

Test sequence and procedure shall be as specified in Table 6 and, if applicable, 4.5.1.1.

TABLE 6 - QUALIFICATION TEST SEQUENCE

Sample Assembly Assembly Assembly AssemblyAssemblyAssemblyAssemblyAssemblyAssembly Assembly AssemblyAssembly1No. 1 2 3 4 5 6 7 8 9 10 11 12

Paragraph 4.6.1 4.6.1 4.6.1 4.6.1 4.6.1 4.6.1 4.6.1 4.6.1 4.6.1 4.6.1 4.6.1 4.6.1

No. 4.6.2 4.6.2 4.6.2 4.6.2 4.6.2 4.6.2 4.6.2 4.6.2 4.6.2 4.6.2 4.6.2 4.6.11

4.6.3 4.6.4 4.6.7 4.6.8 4.6.7 4.6.8 4.6.9 4.6.10 4.6.10 4.6.10 4.6.10

4.6.4 4.6.12 4.6.5 4.6.5 4.6.9 4.6.9

4.6.12 4.6.6

4.6.6

1 For Type II assemblies only. Add one additional AS1633-(SIZE)-0180 hose assembly to hose listed in Table 5 for each size to be qualified.

SAE

4.5 Test Conditions

4.5.1 Fitting Ends

AS620 Revision F - 16 -

Qualification tests shall be conducted on test sample configurations as specified in Table 5. Satisfactory completion of

qualification tests shall also constitute qualification approval for hose assemblies having other fittings that have an

identical attachment method and design.

4.5.1.1 Additional Fitting End Designs

If qualification approval is required for other type end fittings mating design, two additional hose assemblies with the type

end fittings and of the size to be qualified shall be subjected to the following tests in the sequence noted:

a. Examination of product (see 4.6.1)

b. Proof pressure test (see 4.6.2)

c. Leakage test (see 4.6.4)

d. Repetitive assembly torque test (see 4.6.12)

e. Room temperature burst pressure test (see 4.6.5)

4.5.2

4.5.2.1

Preparation of Samples

Unless otherwise specified, length of sample assemblies shall be in accordance with Table 5.

4.5.2.2 Unaged Samples

Unaged assemblies shall be as fabricated from the hose assembly manufacturer.

4.5.3 Test Fluids

Unless otherwise specified, the pressure test fluid shall be hydraulic fluid conforming to MIL-PRF-5606, MIL-PRF-87257,

or MIL-PRF-83282, turbine fuel conforming to MIL-DTL-5624, or water. Where high temperature test fluid is specified, the

test fluid shall be MIL-PRF-83282 hydraulic fluid, MIL-PRF-7808 lubricating oil, or equivalent, unless otherwise specified

by the procuring activity.

4.5.4 Temperature Measurements

Unless otherwise specified, temperature measurements shall be taken within 6 in of the hose assemblies under test.

Unless otherwise specified, all temperatures shall have a tolerance of +15 °F/-5 °F.

4.5.5 Pressure Measurements

Unless otherwise specified, pressure measurements shall have a tolerance of ±20 psi.

4.5.6 End Connections

Unless otherwise specified, each hose end shall be connected to a male fitting end in accordance with AS4395,

AS33514, AS4375, AS4568 or AS4569, and utilizing the installation torque range specified in ARP908 or AS4700 (as

applicable). The use of test fluid as a lubricant is permitted.

SAE

4.6 Inspection Methods

4.6.1 Examination of Product

AS620 Revision F - 17 -

All hose assemblies shall be visually inspected to determine conformance to this document with respect to material, size

and workmanship. Broken or missing reinforcing wires or any evidence of malfunction shall be cause for rejection.

Crossed over reinforcing wires shall not be cause for rejection.

4.6.2

4.6.2.1

Proof Pressure Test

All Class 1 hose assemblies shall be pressure tested with water to the applicable proof pressure specified in

Table 1 for not less than 30 s and not more than 5 min. Failure to meet the requirements of 3.5.1.1 shall be

cause for rejection.

NOTE: Production assemblies that are proof pressure tested with water should be air dried prior to capping

(see cleaning requirements, 3.10.2).

4.6.2.2 All Class 2 hose assemblies shall be tested in accordance with 4.6.2.1. The assemblies shall then be

pneumatically (air or N2) tested for 3 min under water to 25% of the applicable operating pressure specified in

Table 1. Failure to meet the requirements of 3.5.1.2 shall be cause for rejection.

4.6.3 Elongation and Contraction Test

One hose assembly of each size shall be subjected to the elongation and contraction test in accordance with AS2078.

See 3.5.2.

4.6.4 Leakage Test

Two hose assemblies of each size shall be leakage tested in accordance with AS2078. See 3.5.3.

4.6.5 Room Temperature Burst Pressure Test

Two hose assemblies of each size shall be subjected to the room temperature burst test in accordance with AS2078. The

assemblies shall be observed throughout the test and the type of failure and the pressure when failure occurred shall be

recorded. See 3.5.4.

4.6.6 High Temperature Burst Pressure Test

Two hose assemblies of each size shall be subjected to the high temperature burst test in accordance with AS2078

except the maximum ambient and fluid temperature shall be 400 °F. The assemblies shall be observed throughout the

test and the type of failure and the pressure when failure occurred shall be recorded. See 3.5.5.

4.6.7

4.6.7.1

Oil Resistance Test

Two hose assemblies of each size shall be filled with oil conforming to specification MIL-PRF-7808 or another

oil approved for use by the procuring activity and placed in an oven which shall be maintained at 400 °F. Care

shall be taken to insure against the assembly coming in contact with parts of the oven which are at a higher

temperature. The same test fluid shall be used throughout this test, unless otherwise specified. The assembly

shall have a pressure applied equal to the rated operating pressure as specified in Table 1.

At the end of a minimum of 16 h, the assembly shall be removed from the oven, drained and refilled with test

fluid conforming to ASTM Reference Fuel B (70% Isooctane, 30% Toluene) as defined in ASTM D 471. A

pressure shall be applied equal to the rated operating pressure and maintained for a minimum of 2 h at room

temperature.

4.6.7.2

SAE

4.6.7.3

4.6.7.4

AS620 Revision F

The test as specified in 4.6.7.1 and 4.6.7.2 shall be repeated for a total of 3 times.

- 18 -

At the completion of the above tests, the test samples shall be filled with oil and placed in a cold chamber for a

minImum of 4 h, while maintained at -67 °F ± 2 °F. After the minimum 4-h cold soak, the samples shall be

subjected to a pressure equal to the operating pressure specified in Table 1. The pressure shall be held for a

minimum of 5 min and then released. This shall be repeated for a total of 10 times with a minimum of 5 min

between each pressure application.

The assemblies shall again be placed in a cold chamber where the temperature is -67 °F ± 2 °F for 24 h. At the

end of this time, oil at a temperature of 400 °F shall be circulated through the assemblies. Within 15 s after

introduction of the hot oil, the pressure shall be increased to the rated proof pressure and held for a minimum of

2 min.

Any leakage of the test fluid from the assemblies during the preceding tests shall be evidence of failure.

At the conclusion of the above tests, one of the test assemblies shall be subjected to the burst test of 4.6.5.

The other assembly shall be subjected to the flexibility and vacuum test of 4.6.9.

Fuel Resistance Test

4.6.7.5

4.6.7.6

4.6.7.7

4.6.8

Two hose assemblies shall be subjected to the test with a fluid conforming to specification MIL-DTL-5624 (JP4) at the

operating pressure as specified in Table 1 and at a temperature of 260 °F ± 10 °F. The following sequence of tests shall

be performed:

4.6.8.1 The test assembly shall be installed in a controlled temperature box with the fluid and ambient air at room

temperature. The pressure at this time shall be raised to operating as specified in Table 1 and this pressure

shall be maintained throughout 4.6.8.1 and 4.6.8.2. The temperature of the ambient air shall then be reduced

-67 °F ± 2 °F and held for a minimum of 1 h.

The temperature of the fluid and the ambient air shall then be increased to 260 °F ± 10 °F. The hose assembly

shall remain at the ambient and fluid temperature of 260 °F ± 10 °F and at the rated operating pressure for a

minimum of 48 h.

4.6.8.2

4.6.8.3 Upon the completion of the above test, the assemblies shall then be subjected to a static pressure for a

minimum of 5 min at room temperature at the proof pressure as specified in Table 1. The test fluid shall be

ASTM Reference Fuel B (70% Isooctane, 30% Toluene) as defined in ASTM D 471. The assemblies shall

show no evidence of leakage.

4.6.8.4

4.6.9

4.6.9.1

One of the assemblies shall then be subjected to the burst test of 4.6.5, and the other assembly shall be

subjected to the flexibility and vacuum test of 4.6.9.

Flexibility and Vacuum Test

One hose assembly from the fuel resistance test of 4.6.8, one from the oil resistance test of 4.6.7, and one

unaged sample shall be used for this test. The assemblies shall be filled with test fluid conforming to ASTM

Reference Fuel A (100% Isooctane) as defined in ASTM D 471 and placed in a cold chamber for 24 h

maintained at a temperature of -67 °F ± 2 °F.

At the end of this time and while still at this temperature, the assemblies shall be bent to the extreme around a

mandrel with a radius equal to the minimum bend radius specified in Table 1. The bend shall then be reversed

and returned to the straight position. The bend shall be repeated a total of 5 times allowing about 4 s per cycle.

4.6.9.2

SAE

4.6.9.3

AS620 Revision F - 19 -

The assembly shall be drained, a ball of the size listed in Table 4 shall be inserted in the assembly, and placed

in a minimum bend radius in a 400 °F oven. A negative pressure as shown in Table 4 shall be applied for each

particular size. At the end of 4 h, the assembly shall be removed from the oven while continually maintaining

negative pressure. When the assemblies have cooled to room temperature, the negative pressure shall be

released and the ball will be rolled through the hose assembly from fitting to fitting. Failure to pass the ball shall

be evidence of failure.

Upon completion of the test, the assembly shall be subjected to a static test for 5 min at a proof pressure as

specified in Table 1. The test fluid shall be MIL-PRF-7808 or water. The assembly shall show no evidence of

leakage.

The assembly shall be dissected and inspected. Permanent damage to the assembly as a result of bending or

vacuum shall be evidence of failure.

4.6.9.4

4.6.9.5

4.6.10 Pressure Surge Test

Four hose assemblies with standard end fittings of the lengths specified in Table 5 shall be subjected to the pressure

surge tests. Assemblies will be mounted in a 90° bend to the minimum bend radius (Table 1) condition in an oven with

the ambient air and internal fluid temperatures maintained at 400 °F. The test fluid shall be MIL-PRF-7808 or MIL-PRF-83282. All four hose assemblies shall be pressure cycled from 0-7.5% operating pressure to the full 100% operating

pressure, at a rate of not less than 20 cpm or more than 30 cpm, as shown in Figure 2. Any leakage from the hose or

hose attachment to the end fittings at less than 50,000 cycles shall be cause for rejection.

7.5

The curve shown above is the approximate pressure time cycle for proper severity for surge testing hose assemblies. It is

mandatory that the pressure peak rise to 100% of operating pressure. It is considered desirable that the pressure time

curve be confined to the shaded area so that results of tests performed on different test machines will be more nearly

comparable.

FIGURE 2 - PRESSURE SURGE CURVE

SAE

4.6.11 Electrical Conductivity Test (Type II only)

AS620 Revision F - 20 -

One test specimen shall be subjected to the electrical conductivity test in accordance with AS2078 except test set-up

shall be per Figure 3. See 3.5.10.

4.6.12 Repetitive Assembly Torque Test

Two hose assemblies of each size shall be subjected to the repetitive torque test procedure in accordance with ARP908

and torque values as defined in ARP908, or AS4700 for short flareless design, as applicable. See 3.5.11.

5. PREPARATION FOR DELIVERY

5.1 Preservation and Packaging

All standard openings shall be sealed with caps or plugs per NAS 847. Preservation and packaging shall be in

accordance with ARP1835 unless otherwise specified by the procuring activity.

6. NOTES

6.1 Intended Use

The hose assemblies are intended for use in aircraft high temperature fluid systems where pressure surges are limited to

maximum operating pressure ratings listed in Table 1. The specified temperature range is -65 to 400 °F. Pneumatic

storage system applications are not recommended. Installations in which the limits specified herein are exceeded, or in

which the application is not covered specifically by this specification, will be subject to the approval of the procuring

activity. The end fittings of these hose assemblies are not intended for reuse.

6.1.1 Fire Resistance

When fire proofing or fire resistance is a requirement, the test shall be conducted to the procedures and requirements

specified in AS1055. Satisfactory qualification to this standard and AS1055 meet the requirements of AS150 Type III, as

applicable.

6.2 Ordering Data

Procurement documents should specify:

a. Title, number, and date of this specification

b. The applicable “AS” part number required

c. Type, size, or special features of end fittings desired (see 3.3.4)

d. Data requirements (see 4.4.2)

e. Samples subject to destructive testing are not to be considered or shipped as part of the contract or order

f. When fire resistance or fire proofing is required

SAE

AS620 Revision F - 21 -

(13.0”)(1.0”)NON-METALLICCONTAINER

FIGURE 3 - ELECTRICAL CONDUCTIVITY TEST DIAGRAM

SAE

AS620 Revision F - 22 -

6.3 The change bar ( l ) located in the left margin is for the convenience of the user in locating areas where technical

revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left

of the document title indicates a complete revision of the document.

6.4 Key Words

Aerospace, hose assembly, polytetrafluoroethylene, convoluted, medium pressure

PREPARED BY SAE SUBCOMMITTEE G-3D, AEROSPACE HOSE OF

COMMITTEE G-3, AEROSPACE COUPLINGS, FITTINGS, HOSE, AND TUBING ASSEMBLIES