1、AS8775Issued 1998-07Hydraulic System Components, Aircraft andMissiles, General Specification ForNOTICEThis document has been taken directly from U.S. Military Specification MIL-H-8775D, Amendment 1 and contains only minor editorial and format changes required to bring it into conformance with the pu
2、blishing requirements of SAE technical standards. The initial release of this document is intended to replace MIL-H-8775D, Amendment 1. Any part numbers established by the original specification remain unchanged.The original Military Specification was adopted as an SAE standard under the provisions
3、of the SAE Technical Standards Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated adoption of government specifications and standards. TSB rules provide for (a) the publication of portions of unrevised government specifications and standards without consensus voting at the SAE Com
4、mittee level, and (b) the use of the existing government specification or standard format.Under Department of Defense policies and procedures, any qualification requirements and associated qualified products lists are mandatory for DOD contracts. Any requirement relating to qualified products lists
5、(QPLs) has not been adopted by SAE and is not part of this technical report.AEROSPACESTANDARDReaffirmed 2008-11SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary,
6、and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written
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9、/standards/AS8775SAE AS8775- 2 -1. SCOPE:1.1 Scope:This specification covers the general requirements that are common to most hydraulic components (see 6.2), used in aeronautical hydraulic systems (see 6.1).1.2 Classification:Aircraft hydraulic systems in which components covered by this specificati
10、on are to be used shall be of the following types, as specified:Type I -65 to +160F fluid temperature rangeType II -65 to +275F fluid temperature range2. APPLICABLE DOCUMENTS:2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of the
11、 specification to the extent specified herein.SPECIFICATIONSFederalQQ-C-320 Chromium Plating (Electrodeposited)QQ-N-290 Nickel Plating (Electrodeposited)QQ-P-416 Plating, Cadmium (Electrodeposited)QQ-S-365 Silver Plating, Electrodeposited, General Requirements forQQ-Z-325 Zinc Coating, Electrodeposi
12、ted, Requirements forMilitaryMIL-C-5015 Connectors, Electric “AN” TypeMIL-H-5440 Hydraulic Systems, Aircraft Types I and II, Design, Installation, and Data, Requirements forMIL-C-5501 Cap and Plug, Protective, Dust and Moisture SealMIL-P-5510 Packing, Preformed, Straight Thread Tube Fitting BossMIL-
13、G-5514 Gland Design, Packings, Hydraulic, General Requirements forMIL-C-5541 Chemical Conversion Coatings on Aluminum and Aluminum AlloysMIL-H-5606 Hydraulic Fluid, Petroleum Base, Aircraft, Missile, and OrdnanceMIL-H-6083 Hydraulic Fluid, Petroleum Base, for Preservation and OperationMIL-I-6866 Ins
14、pection, Penetrant Method ofMIL-I-6868 Inspection Process, Magnetic ParticleMIL-M-7969 Motor, Alternating Current, 400-Cycle, 115/200-Volt System, Aircraft, General Specification forSAE AS8775- 3 -2.1 (Continued):Military (Continued)MIL-M-8609 Motors, Direct Current, 28-Volt System, Aircraft, Genera
15、l Specification forMIL-A-8625 Anodic Coatings, for Aluminum and Aluminum AlloysMIL-R-8791 Retainer, Packing, Hydraulic, and Pneumatic, Tetrafluoroethylene ResinMIL-S-8879 Screw Threads, Controlled Radius Root with Increased Minor Diameter, General Specification forMIL-T-10727 Tin Plating, Electrodep
16、osited or Hot-Dipped, for Ferrous and Nonferrous MetalsMIL-H-25475 Hydraulic Systems, Missile, Design, Installation Tests, and Data Requirements, General Requirements forMIL-P-25732 Packing, Preformed, Petroleum Hydraulic Fluid Resistant, 275 Deg. F.MIL-C-26074 Coating, Electroless Nickel, Requireme
17、nts forMIL-F-27656 Filter Unit, Fluid, Pressure MXU-408/M, Absolute 5 Micron, HydraulicMIL-C-38999 Connector, Electrical, Circular, Miniature, High Density Quick DisconnectMIL-G-81322 Grease, Aircraft, General Purpose Wide Temperature RangeMIL-S-81733 Sealing and Coating Compound, Corrosion Inhibiti
18、veMIL-F-81836 Filter and Disposable Element, Fluid Pressure, Hydraulic, 3 Micron AbsoluteMIL-H-83282 Hydraulic Fluid, Fire Resistant Synthetic Hydrocarbon Base, AircraftMIL-P-83461 Packings, Preformed, Petroleum Hydraulic Fluid Resistant, Improved Performance of 275 Degrees F., Sizes and TolerancesM
19、IL-C-83982 Compound, Sealing, Fluid ResistantSTANDARDSFederalFED-STD-791 Lubricant, Liquid Fuel and Related Products, Methods of TestingMilitaryMIL-STD-100 Engineering Drawing PracticesMIL-STD-129 Marking for Shipment and StorageMIL-STD-130 Identification Marking of U.S. Military PropertyMIL-STD-143
20、 Standards and Specifications, Order of Precedence for the Selection ofMIL-STD-454 Standard General Requirements for Electronic EquipmentMIL-STD-461 Electromagnetic Interference Characteristics, Requirements for EquipmentMIL-STD-462 Electromagnetic Interference Characteristics, Measurement ofMIL-STD
21、-463 Definition and System of Units, Electromagnetic Interference TechnologyMIL-STD-490 Specification PracticesMIL-STD-704 Electric Power, Aircraft, Characteristics and Utilization ofMIL-STD-785 Reliability Program for Systems and Equipment Development and ProductionMIL-STD-810 Environmental Test Me
22、thodsMIL-STD-889 Dissimilar MetalsSAE AS8775- 4 -2.1 (Continued):Military (Continued)MIL-STD-961 Outline of Forms and Instructions for the Preparation of Military Standards and Association DocumentsMS20659 Terminal, Lug, Crimp Style, Copper, Uninsulated, Ring Tongue, Type I, Class IMS20995 Wire, Saf
23、ety or LockMS21209 Insert, Screw Thread, Coarse and Fine, Screw Locking, Helical Coil, CresMS21343 Boss Spacing-Hydraulic Design, Standard forMS21344 Fitting-Installation of Flared Tube, Straight Threaded Connectors, Design Standard forMS27595 Retainer, Packing Backup, Continuous Ring, Tetrafluoroet
24、hyleneMS28772 Packing, “D” Ring, Shock StrutMS28774 Retainer, Packing Backup, Single Turn TetrafluoroethyleneMS28775 Packing, Preformed, Hydraulic, Plus 275 Deg. F. (“O” Ring)MS28778 Packing, Preformed, Straight Thread Tube Fitting BossMS28782 Retainer, Packing, Back-Up, TeflonMS28783 Ring, Gasket,
25、Back-Up, TeflonMS33514 Fitting End, Standard Dimensions for Flareless Tube Connection and Gasket SealMS33515 Fitting End, Standard Dimensions for Bulkhead Flareless Tube ConnectionsMS33540 Safety Wiring and Cotter Pinning, General Practices forMS33547 Pin, Spring, Functional Limitiations ofMS33649 B
26、oss, Fluid Connection - Internal Straight ThreadMS33656 Fitting End, Standard Dimensions for Flared Tube Connection and Gasket SealMS33657 Fitting End, Standard Dimensions for Bulkhead Flared Tube ConnectionsAir Force-Navy AeronauticalAN814 Plug and Bleeder - Screw ThreadAN6227 Packing, “O” Ring Hyd
27、raulicAN6230 Gasket, “O” Ring HydraulicAND10476 Washer - Limitations on Usage of LockPUBLICATIONSAir Force - Navy Aeronautical BulletinMIL-147 Specifications and Standards of Non-Government Organizations Released for Flight Vehicle ConstructionSAE AS8775- 5 -2.1 (Continued):Military BulletinMIL-HDBK
28、-5 Metallic Materials and Elements for Aerospace Vehicle StructuresMIL-HDBK-221 Fire Protection Design Handbook for U.S. Navy Aircraft Powered by Turbine Engines(When requesting applicable documents, refer to both title and number. Copies of unclassified documents may be obtained from the Commanding
29、 Officer, Naval Publications and Forms Center, 5801 Tabor Avenue, Philadelphia, Pennsylvania 19120. Requests for copies of classified documents should be addressed to the Naval Publications and Forms Center, via the cognizant Government representative.)2.2 Other publications:The following document f
30、orms a part of this specification to the extent specified herein, unless otherwise indicated, the issue in effect on the date for bids or request for proposal shall apply.American National Standards InstituteANSI B46.1 1962 Surface Texture (Surface Roughness, Waviness and Lay)(Copies of the above pu
31、blication may be obtained from the American National Standards Institute, 10 East 46th Street, New York, New York 10017.)Society of Automotive EngineersARP 603 Impulse Testing of Hydraulic Hose Assemblies, Tubing and FittingsARP 1383 Impulse Testing of Hydraulic Actuators, Valves, Pressure Container
32、s and Similar Fluid System Components(Copies of the above publication may be obtained from the Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, Pennsylvania 15096.)National Aerospace Standards Association, Inc.NAS 1638 Cleanliness Requirements for Parts Used in Hydraulic Systems(
33、Application for copies should be addressed to the National Aerospace Standards Association, Inc., 1321 Fourteenth St., N.W., Washington, DC 20005.)SAE AS8775- 6 -3. REQUIREMENTS:3.1 Contractors general component specification:In those cases where, by mutual agreement between the contractor and the p
34、rocuring activity, it is determined that this specification cannot be readily applied to a particular hydraulic system, or the number of deviations necessary would make this specification impracticable, the contractor shall prepare a general component specification similar to this specification, in
35、conformance toMIL-STD-490 and MIL-STD-961 and submit it to the procuring activity for approval. This document shall specify the performance, design, and testing requirements for all the components in the hydraulic system and also shall be the controlling document for components not otherwise covered
36、 by an applicable detail component specification.3.2 Materials:Materials used in the manufacture of hydraulic components shall be of high quality, suitable for the purpose, and shall conform to applicable Government specifications. Materials conforming to contractors specifications may be used, prov
37、ided it can be clearly demonstrated that they are at least equivalent to Government specifications with respect to operating characteristics and that a savings in weight or cost can be accomplished. Contractors specifications must be satisfactory to the Government and contain provisions for adequate
38、 tests. The use of contractors specifications will not constitute waiver of Government inspection.3.2.1 Metals: All metals shall be compatible with the fluid and intended temperature, functional, service, and storage conditions to which the components will be exposed. Metals shall be limited to thos
39、e specified by the detail specification. The metals shall possess adequate corrosion-resistant characteristics or shall be suitably protected by the use of coatings equivalent to those listed in Table I to resist corrosion which may result from such conditions as dissimilar metal combinations, moist
40、ure, salt spray, and high temperature deterioration, as applicable. Where not indicated, class or type is at the option of the manufacturer, subject to approval by the procuring activity. Dissimilar metals are defined in MIL-STD-889. Unless otherwise specified herein, physical properties of all meta
41、ls shall meet the minimum requirements of MIL-HDBK-5.3.2.1.1 Copper and Aluminum alloys: All copper alloys except for bearing surfaces shall be suitably protected with a coating selected from Table I, except that cadmium and zinc plating shall not be used in applications subject to abrasion. Other m
42、etallic coatings, which shall have been demonstrated to be satisfactory to the Government, such as electrodeposited 85 percent tin and 15 percent cadmium alloy, may be used. All aluminum alloys shall be anodized in accordance with MIL-A-8625, type II coating, except that in the absence of abrasive c
43、onditions the anodize may be type I coating, where applicable, or may be a chemical film in accordance withMIL-C-5541.SAE AS8775- 7 -TABLE I. METAL COATINGS3.2.1.2 Type I components: Except for internal surfaces in constant contact with hydraulic fluid, ferrous alloys shall have a chromium content o
44、f not less than 12 percent, or shall be suitably protected against corrosion as specified in 3.2.1, 3.2.1.1, and Table I. In addition, cadmium and zinc plating shall not be used for internal parts or on internal surfaces in contact with hydraulic fluid or exposed to its vapors. O-ring grooves for ex
45、ternal seals shall not be considered as internal surfaces in constant contact with hydraulic fluid. Use of magnesium shall be subject to the approval of the procuring activity.3.2.1.3 Type II components: Ferrous alloys shall have a chromium content of not less than 12 percent, or shall be internally
46、 and externally protected against corrosion as specified in 3.2.1, 3.2.1.1, and Table I. In addition, cadmium and zinc plating shall not be used for internal parts or on internal surfaces in contact with hydraulic fluid or exposed to its vapors. Magnesium shall not be used for type II components.3.2
47、.1.4 Residual magnetism: Parts made of material that is capable of retaining residual magnetism, but are not intended to function as magnets, shall be demagnetized sufficiently to prevent system or component malfunction, including malfunction due to accumulation of magnetic contaminants.Where a comp
48、onent or system is vulnerable to malfunction due to residual magnetism, the component detail specification shall specify the maximum allowable flux density.3.2.1.5 Magnets: Permanent magnets and electromagnets shall be shielded where required to prevent system or component malfunction. The detail sp
49、ecification shall specify the maximum allowable flux density outside the shield.3.2.2 Plastic parts: The use of plastic parts shall be subject to the approval of the procuring activity for the specific application involved.SAE AS8775- 8 -3.2.3 Selection of materials, parts and processes: Specifications and standards for all materials, parts, and Government certification and approval of processes and equipment, which are not specifically designated herein and which are necessary for the execution of this specification, shall be selected in accordance with M
