MIL-J-26149E
a. There is no exclusion to the use of recovered materials.
b. There is no requirement that an item be manufactured from virgin materials,
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 the maximum extent possible.
3.5.2 M etals.
Metals shall be corrosion resistant or treated to resist
corrosion due to fuels, salt fog, or atmospheric conditions likely to be encountered in storage or normal service. Stock used in the fabrication of jacks shall have a properly refined structure with uniform 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, either natural or artificial, to insure maximum stability.
3.5.2.1 Dissimilar metals. Unless specifically protected against electrolytic corrosion, dissimilar metals shall not be used in intimate conract with each other. Dissimilar metals are defined in and shall be used in accordance with MIL-STD-889.
3.5.2.2 Standard steel. Suitable steel complying with ASTM or AISI
standards shall be utilized 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, D1. 1-86, as issued by the American Melding Society CAWS) and welding aluminum shall be in accordance with D1 .2-83.
3.5.2.4 Brazing. All brazing shall be accomplished in accordance with the Brazing Manual 1976 issued by the American Melding Society.
3.6 Design and construction. The jack shall be axle, cantilever, unipod or tripod, designed for 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. 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. All components shall be arranged for maximum ease of operation and maintenance consistent with the utility and efficiency required to conform to the requirements specified herein.
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