1、rr MIL-S-2251A 27 m 9997906 01921L O W MIL-S-22518A(AS) 19 March 982 SUPERSEDING 26 May 1960 MIL-S -2 2 5 18 (WEP) MILITARY SPECIFICATION STARTER, AIR TURBINE, ACCESSORY DRIVE COMBINATION, AIRCRAFT ENGINE, GENERAL SPECIFICATION FOR This specification is approved for use by the Naval Air Systems Comm
2、and, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification establishes the requirements for an aircraft turbine engine air turbine starter and accessory drives (ATS/AD). 1.2 Classification. ATS/ADs shall
3、be of the model designations shown on the specification sheets. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. Unless otherwise specified, the following specifications, standards, and handbooks of the issue listed in that issue of the Department of
4、Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specification to the extent specified herein. SPECIFICATIONS Federal QQ-C-320 Chromium Plating (Electrodeposited) QQ-N-290 Nickel Plating (Electrodeposited) QQ-P-4 16 Plating, Cadmium (Electrodep
5、osited) QQ-S- 3 65 Silver Plating (Electrodeposited) ; General Requirements for Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: ENGINEERING SPECIFICATIONS AND STANDApS DEPARTMENT (CODE 93) NAVAL
6、 AIR ENGINEERING CENTER, LAKEHURST , NJ 08733, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-S-Z251A 2
7、9 W 9999906 0292339 2 M MIL+-22518A(AS) SPECIFICATIONS (Continued) Federal (Continued) QQ- 2-325 PPP-B-585 PPP-B-601 PPP-B-621 PPP-T- 60 Milftary MIL-P- 11 6 MIL-B- 12 1 DOD-D-1000 MIL-H-5440 MIL-C-5501 MIL-C-5541 MIL-P-7 105 MIL-S-7742 MIL-L- 78 08 MIGA-8625 MIL-S-8879 MIL-T- 10727 MIL-C-11796 Zinc
8、 Coating, Electrodeposited, Requirements for Box; Wood, Wirebound Boxes , Wood, Cleated Plywood Box, Wood, Nailed and Lock Corner Tape, Packaging, Waterproof Preservation, Methods of Barrier Material, Greaseproofed, Waterproofed, Flexible Drawings, Engineering and Associated Lists Hydraulic Systems,
9、 Aircraft, Types 1 and II, Design and Installation Requirements for Cap and Plug, Protective, Dust and Moisture Seal, General Specification for Chemical Conversion Coatings on Aluminum and Aluminum Alloys Pipe Threads, Taper, Aeronautical National Form, Symbol ANPT, General Requirements for Screw Th
10、reads, Standard, Optimum Selected Series; General Specification for Lubricating Oil, Aircraft Turbine Engine, Synthetic Base Anodic Coatings, for Aluminum and Aluminum Alloys Screw Threads, Control1ed.Radius Root With Increased Minor Diameter; General Specification for Tin Plating, Electrodeposited
11、or Hot-dipped, for Ferrous and Nonferrous Metals Corrosion Preventive Compound, Petrolatum Hot Application Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-225LA 27 7797706 0372320 7 MIL-S-22518A(AS) SPECIFICATIONS (Continued) Military (Continue
12、d) MIL-C-16173 MIL-L- 23 699 MIL-H-25475 MIL-V- 8 1 995 STANDARDS Mil it ar y DOD-STD-100 MIL- S TD- 12 9 MIL-STD-130 MIL-STD- 143 MIL-STD-28 O DOD-STD-480 MIL-STD-810 MIL-STD-889 MIL-STD- 1523 MS3106 MS17320 Corrosion Preventive Compound, Solvent Cutback, Cold-application Lubricating Oil, Aircraft
13、Turbine Engines , Synthetic Base Hydraulic System, Missile Design, Installation Tests and Date Requirements, General Requirements for Valve, Starter Control, Aircraft Engine, General Specification for Engineering Drawing Practices Marking for Shipment and Storage Identification Marking of U.S. Milit
14、ary Property Standards and Specifications, Order of Precedence for the Selection of Definitions of Item Levels , Item Exchangeability, Models, and Related Terms Configuration Control - Engineering Changes, Deviations and Waivers Environmental Test Methods Dissimilar Metals Age Controls of- Age-sensi
15、tive Elastomeric Material Connector, Plug, Electric, Straight, Solder Contacts, AN Type Quick Attach-Detach Mounting Devices for Aircraft Electric Equipment, Circular, 5-, 8-, and 10-inch 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MITcS-225LA
16、27 9 777770b 0172L2L O W MIL-S-22518A(AS) STANDARDS (Continued) Mil it ar y (Continued) MS33540 Safety Wiring and Cotter Pinning, General Practices for MS33649 Bosses, Pluid Connection, Internal Straight Thread MS33658 Fitting End, Hose Connection, Standard Dimensions for NAVAL AIR SYSTEMS COMMAND M
17、IL BULL 544 List of Specifications and Standards (Book Form) AIR FORCE - NAVY AERONAUTICAL AND 20002 Drive - Type XII Engine Accessory AND 10262 Flange, Type XII, Accessory Mounting (Copies of specifications, standards, handbooks, drawings, and publications required by manufacturers in connection wi
18、th specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publications. The following document(s) form a part of this specification to the extent specified herein. of the documents which are indicated as DoD adopted shall
19、 be the issue listed in the current DoDISS and the supplement thereto, if applicable. The issues SOCIETY OF AUTOMOTIVE ENGINEERS STANDARDS AS 468 Drive, Accessory, Five Inch Bolt Circle AS 471 Flange, Accessory, Five Inch Bolt Circle E527 Numbering, Metals and Alloys, UNS (Application for copies sho
20、uld be addressed to the Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096.) 2.3 Order of precedence. In the event of a conflict between the text of this Specification and the references cited herein, the text of this specification shall take precedence. Provided by IHSNot
21、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-225LA 29 I 9999906 0192122 2 MIL-S-22518A(AS) 3. REQUIREMENTS 3.1 Specification sheets. The individual ATS/AD requirements shall he as specified herein and in accordance with the applicable Specification Sheets. of
22、 this specification and the Specification Sheet, the requirements of the Specification Sheet shall govern. In the event of conflict between the requirements 3.2 Qualification. ATS/ADs furnished under this specification shall be products whlch are.qualified for listing on the applicable Qualified Pro
23、ducts List at the time set for opening of bids (see 4.3 and 6.3). 3.2.1 Data. Unless specified in the contract, data cited in this specification is only required as part of the qualification submittal. 3.2.2 Materials and parts. Materials and parts used in the manufacture of the ATS/ADs shall be o h
24、igh quality, suitable for the purpose and shall conform to applicable Government specifications. Materiais, parts, and processes shall conform to applicable Government specifications listed in MIL-BULL-544. Contractor or industry specifications may be used for materials or processes not covered by t
25、he documents . listed in MIL-BULL-544, provided the specifications are approved by the qualifying activity and contain provisions for adequate tests. 3.2.3 Selection of specifications, standards and drawings. Specifications, standards and drawings applicable to the design and construction of the ATS
26、/ADs shall be in accordance with those documents listed in MIL-BULL-544 approved by the Naval Air Systems Command and takes precedence in accordance with MIL-STD-143. 3.2.4 Packings. All packings shall be in accordance with the requirements of MIL-H-5440 or MIL-H-25475 as applicable. synthetic rubbe
27、r parts shall be coptrolled in accordance with MIL-STD- 1523. Age of 3.2.5 Metals. All metals used in the construction of the ATS/ADs except metals which are in constant contact with oil, shall be of a corrosion-resistant type or shall be suitably protected in accordance with 3.2.5.1. shall be avoid
28、ed wherever practicable. The use of dissimilar metals, as defined by MIL-STD-889, 3.2.5.1 Corrosion protection. Metals which do not inherently possess adequate corrosion-resistant characteristics shall be suitably protected, in accordance with the following subparagraphs, to resist corrosion which m
29、ay result from such conditions as dissimilar metal combinations, moisture, salt spray, and high temperature deterioration as applicable Treafments that tend ta promote stress corrosion in surfaces that contain residual tensile stresses shall be avoided. 5 Provided by IHSNot for ResaleNo reproduction
30、 or networking permitted without license from IHS-,-,-MIL-S-225 18A(AS) 3,2.5.2 Ferrous and copper alloys. Ferrous alloys requiring corrosion-preventive treatment, and all copper alloys except for parts having bearing surf aces, shall have a suitable electrodeposited metallic coatng selected from th
31、e following list, except that tin, cadmium, and zinc platfng shall not be used for internal parts or on internal surfaces in contact wth oil or exposed to its vapors, nor where subject to abrasion. manufacturer, Where not indicated, class or type is at the option of the Cadmium Platlng QQ-P-416-1, T
32、ype II, Class B Zinc Plating QQ-2-325, Class II, Type II Chromium QQ-C-320 Nickel QQ-N-290 Silver QQ-S-365 Tin MIL-T-10727, Type I 32,503 Aluminum alloys, Unless otherwise specified, all aluminum alloys shall be anodized in accordance with MIL-A-8625, except that in the absence of abrasive condition
33、s, they may be coated with chemical film in accordance with MIL-C-5541, be subject to the approval of the qualifying activity. - The exceptions noted will 3,2,5,4 Magnesium alloy, Magnesium or its alloy shall not be used. 3.3 Design. 303.1 General, The ATS/AD is intended to serve two functions when
34、mounted on the engine. to the air inlet, the ATS/AD shall furnish sufficient torque to start the engine, accessory power through an accessory pad driven with a suitable overrunning device to prevent operation of those parts necessary for starting only. The ATS/AD shall incorporate a reverse overload
35、 release mechanism to protect the unit against an engaging mechanism failure during engine operation. as to wtlistand the normal severe usage encountered in service under the environmental conditions specified herein, When the required compressed air is applied After the engine is started, the ATS/A
36、D shall provide The ATS/AD shall be of a compact design and of such construction 3,3,2 Environmental conditions, The unit shall be designed for satisfactory operation, without impairment of function or change in adjustment, throughout the ambient temperature range specified on the Specification Shee
37、t and shall not be damaged when exposed to temperatures specified thereon, Consideration shall be given in the design of the ATS/AD to satisfactory operation during and after exposure to any combination of the following conditions in worldwide operation: humidity, fungus, rain, snow, sleet, hail, ic
38、e-fog, mildew, salt-spray, ice, sand, and dust. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-225LA 27 77777Ob OL72124 b W 3.3.2.1 Vibration and acceleration forces, The ATS/AD shall be capable of withstanding the acceleration forces and comp
39、leting the vibration tests specified on the Specification Sheet. 3.3.2.2 Control valve operation. The ATS/AD shall be capable of operating with a remote air control valve having an opening and a closing rate as specified on the Specification Sheet. capable of operating with the MIL-V-81995 control v
40、alve specified on the Specification Sheet. It shall also be 3.3.3 Component parts. The ATS/AD shall consist of a turbine rotor, reduction gearing, an automatically operated engaging and disengaging mechanism for coupling with the engine drive, and a torque overload protective device. Automatic shuto
41、ff controls shall be provided. 3.3.4 Oil seal. The ATS/AD shall be designed and constructed to prevent the entrance of engine oil into it and the leakage of lubricants from it. 3.3.5 Lubrication. The ATS/AD shall be self-lubricated, including internal splines, by one of the following lubricant(s).:
42、a. MIL-L-23699 oil. b. MIL-approved grease(s). c. MIL-approved grease(s) and MIL-L-23699 oil. If MIL-L-23699 oil is used, the ATS/AD shall also be compatibAe with MIL-L-7808 oil. 7808 oil shall be suitable for use throughout the temperature range specified on the Specification Sheet. completing the
43、endurance test specified on the Specification Sheet without changing or adding any lubricant. Use of MIL-L-23699 oil may be limited to -40 F. MIL-L- The ATS/AD shall be capable of 3.3.6 Oil system. An oil reservoir shall be provided with a dipstick marked “FULL“ and “ADD“ to determine the oil level.
44、 The dipstick shall be of a self-locking type and shall be retained with the ATS/AD by means of a lanyard when removed from the reservoir. Two oil reservoir ports, one on each side of the ATS/AD, shall be provided for dipstick installation; the unused port shall be capped. shall be provided, Either
45、the dipstick ports or separate ports similarly located will be acceptable. One oil drain port shall be provided. Optimum dipstick and port location with respect to starter servicing shall be determined during the aircraft mockup of 4.5.19. No liquid lubricant shall issue from any lubricating system
46、vent(s) during any mode of operation. Oil fill ports 3.3.7 Part numbering of interchangeable parts. All parts having the same design activity FSCM (Federal Supply Code for Manufacturers) and part number shall be interchangeable as defined in MIL-STD-280. item identification and part number requireme
47、nts of DOD-STD-100 shall govern the design activity part numbers and changes thereto. The Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3,3.8 Design and construction changes. 3.3.8,l Material substitutions. Material substitutions shall be subject t
48、o the approval of the qualifying activity. Index of Aeronauticallaterial Specification and ASTM Standard E527 (SAE Designation 51086) Numbering Metals and A3loys (UNS) may be used as guides for material substitutions. The SAE 3.3.8.2 Changes in design. No changes shall be made in the design or mater
49、ials of an ATS/AD model that has been qualified, in accordance with this specification, except when the changes are approved by the qualifying activity in accordance with DOD-STD-480. 3.3.8.3 Parts list. The parts list of the ATS/AD which successfully completes the required qualification tests shall constitute a requirement for production ATS/ADS. ATS/AD parts list in features of design and construction shall be governed by the provi
