DLA MIL-J-26149 E-1988 JACK HYDRAULIC AIRCRAFT MAINTENANCE GENERAL SPECIFICATION FOR《飞行器维护液压支撑物的常规》.pdf
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1、I NCH-POUND I MI L-J-261 49E 30 December 1988 SUPERSEDING MI L-J-261 49D 12 June 1987 (See 6.6) * MILITARY SPECIfICATION GENERAL SPECIFICATION FOR JACK, HYDRAULIC, AIRCRAFT MAINTENANCE, This specification is approved for use by all Departments and Agencies of the Department of Defense. 1 . SCOPE 1.1
2、 Scope. This specification covers the general requirements for weapon systems hydraulic jacks as used with all types of military aircraft. - t I r ! L E f i. 1.2 Classification. All aircraft jacks shall be classified as to their design or use. These classifications shall be.in accordance with Table
3、I. TABLE 1. Classification of Aircraft Jacks. CLASSIFICATION CHARACTERISTIC OF REFERENCE OF JACKS JACK DESIGN LANDING GEAR HAND CARRI ED- MS26566 (AXLE) DOLLY MOUNTED CANTILEVER AIRFRAME FIXED HEIGHT MS33589 (UNIPOD quantity; warning symbol; signal word designating degree of hazard; affirmative stat
4、ement of hazards; precautionary measures covering actions to be followed or avoided; instructions in case of contact or exposure; antidotes and notes to physic.ians; instructions in case of fire, spill, or leak; instructions for handling and storage; and disposal instructions. Characteristics and op
5、erating-hazards which require labeling include: toxic, high toxic, irritant, corrosive, strong sensitizer, combustible liquid, flammable, extremely flammable liquid, dangerously reactive, pressure- generation, explosive, magnetic, ionizing radiation, non-ionizing radiation; high voltage, implosion,-
6、 noise, and etiologic agent. Marking of hazardous materials shall be in conformance .with establ i shed and approved procedures. 3.5.1.3 Recycled, virgin and reclaimed materials. When the intended use of the aircraft jack(s) will be jeopardized by the use of reclaimed or recycled materials these mat
7、erials shall not be used. However, the following shal-1 apply: 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-J-261 49E MIL-J-26L49E L7 9 7779706 OL938B7 B 9 a. There is no exclusion to the use of recovered materials. b. There is no requiremen
8、t that an i tem be manufactured from virgin materi al s. c. Within 1 year from the date of issue by the environmental protection agency of guidelines designating items which are or can be produced with recovered materials, specifications for such products require the use of recovered materials to th
9、e maximum extent possible. 3.5.2 Metals. Metals shall be corrosion resistant or treated to resist corrosion due to fuels, salt fog, or atmospheric conditions likely to be encountered in.strage or normal service. Stock used in the fabrication of jacks shall have a properly refined structure with unif
10、orm elemental distribution, sound and free from nonmetallic inclusions, injurious porosity, excess segregation, and soft or hard spots. Castings shall be of uniform quality, free from blowholes, excess porosity, and soft or hard spots. All castings shall be subjected to a seasoning or aging process,
11、 either natural or artificial, to insure maximum stabi 1 i ty. 3.5.2.1 Dissimilar metals. Unless specifically protected against electrolytic corrosion, dissimilar metals shall not be used in intimate contact with each other. Dissimilar metals are defined in and s.hall be used in accordance wi th MIL
12、-STD-889. 3.5.2.2 Standard steel. Suitable steel complying with ASTM or AIS1 standards shall be uti 1 ized in the manufacture of the jack 3.5.2.3 Welding material. All welding of the jack shall be in accordance with the structural welding code for steel, Dl.1-86, as issued by the American Welding So
13、ciety (AWS) and welding aluminum shall be in accordance with 01.2-83. 3.5.2.4 Brazing. All brazing shall be accomplished in accordance with the Brazing Manual 1976 issued by the American Welding Society. 3.6 Design and construction. The jack shall be axle, cantilever, unipod or tripod, designed for
14、the load capacity required. The aircraft configuration which will effect the jack installation and operation shall be considered in the design of all jacks. The jack shall be designed and constructed so that all parts are made for assembly without interference and no parts will work loose in service
15、. The jack shall be designed and constructed to withstand the strains, jars, vibration, and other.conditions incident to shipping, storage, installation and service. MS26566 or MS33589 *shall be used as design guides. 3.6.1 Component arrangement. Al 1 components shall be arranged for maximum ease of
16、 operation and maintenance consistent with the utility and efficiency required to conform to the requirements specified herein. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-J-26347E L7 m 777770b 0373888 T m MIL-J-26149E 3.6.1.1 Component sel
17、ection. All components shal proper clearances and adjustments. They shall so work will supply the rated capacity. 1 be new and shall have together that the jack 3,6.1.2 Component maintenance. All components shall be selected on the basis of maximum life cycle with a minimum of maintenance. Selection
18、 shall be made primarily from approved standard parts using the best engineering practices. Whenever possible extended life parts shall be utilized. As required by the contract the parts control program shall be in accordance with MIL-STD-965. 3.6.2 Reliability. (MTBF) of not less than for a 1-cycle
19、 mission at The jack shall have a-mean-time-between-failures 0.9 confidence (see 6.7.4). 108 cycles with a reliability of not less than 0.9908 3.6.3 Maintainability. The jack shall be designed and constructed as specified herein and to provide the following: a. Minimum number of parts consistent wit
20、h reliability and performance specified herein. b. Minimum amount of training and time necessary for assembly, disassembly, location of trouble sources, and maintenance including servicing. Where practical, parts and components shall be located or positioned for rapid and simple inspection and recog
21、nition of excessivewear or potential failure. c. Permit adjustments, servicing, replacement of parts and components, and other maintenance with minimum disturbance to other equipment parts or components. Parts and components shall be located for ample and rapid access unless performance .or re1 iabi
22、lity will be appreciably degraded by the accessible -location. In performing maintenance, if engineering reasoning or data determines that physical or visual interference between items cannot be avoided, the i tem predicted to require the most maintenance shall be located for best accessi bi 1 i ty
23、and ease of maintenance. d. Permit maintenance with general purpose tools and equipment normally available commercially. Use of special purpose tools and equipment shall be subject to .approval by the procuring activity. e. Minimum number of tools required for maintenance by design practices such as
24、 reducing the variety of bolt head sizes- to the practicable -minimum; 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-J-26247E 27 W 7777706 0273887 L W MIL-J-26149E f. Foolproofness - Where improper installation of an item could cause malfunct
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