MIL-STD-2088-SUP-2 Bomb Rack Unit BRU, Single Store, AircraftThis standard establishes the general guidelines and criteria for the design and development of a single store bomb rack unit BRU for carriage and release of airborne stores excluding air-to-air missiles from fixed wing and rotary wing aircraft using a single suspension point or suspension points spaced at 14 or 30 inches. This standard addresses detailed requirements for gravity non-ejected, pyrotechnic, hydraulic, and pneumatic powered BRUs. Mechanical aircraft armament interoperable interfaces are incorporated to enhance cross utilization and servicing capabilities between military aircraft and aircraft stores see 3.1 of all services of the Department of Defense DoD and North Atlantic Treaty Organization NATO nations.

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MIL-STD-2088B

TABLE I.  Carriage characteristics of BRU types.

4.2  Selection of materials, specifications, standards and drawings.  The selection of materials, standard parts, processes, corrosion protection, and design features significant in corrosion behavior shall be in accordance with the guidelines of SD-24.

4.2.1  Materials.  Materials shall conform to applicable specifications, be compatible with conditions of 4.3.10, and shall be as specified herein and on applicable drawings.  Design shall make maximum use of standard (such as MS, AN, SAE, and MIL-DTL/PRF) parts, materials and processes, rather than special or peculiar items.  Materials that are not covered by government specifications or that are not specifically described herein shall be of the best quality, suitable for the purpose intended.  Particular care shall be given to close-fitting parts in the choice of both materials and corrosion prevention methods.  Materials should be selected such that wet lubricants or preservatives are not required.  Particular care shall be taken to minimize the use of ozone depleting materials or coatings, and toxic materials such as cadmium or chrome plating.

4.2.1.1  Metal parts.  All metal parts shall be of the corrosion resistant type or treated in a manner to render them resistant to corrosion.  Type 431 corrosion resistant steel shall not be used.  Unless protected against electrolytic corrosion, dissimilar metals, as specified in

MIL-STD-889, shall not be used in contact with each other.  General design information governing usage of metals shall be as provided in DOT/FAA/AR-MMPDS.

4.2.1.1.1  Heat treatment.  Heat treatment of aluminum, steel, and titanium parts shall be in accordance with SAE-AMS-H-6088, SAE-AMS-H-6875, and SAE-AMS-H-81200 respectively.

4.2.1.1.2  Castings.  Castings shall conform to the requirements of SAE-AMS2175 with appropriate class, grade, and critical area notations.  Aluminum alloy castings, used in critical strength applications, shall conform to the requirements of SAE-AMS-A-21180.

4.2.1.1.3  Forgings.  Forgings shall conform to the requirements of SAE-AMS-F-7190, SAE-AMS4931, SAE-AMS4965, SAE-AMS-T-9047, or SAE-AMS-QQ-A-367 with

appropriate grade and grain flow notations.  Forgings, used in critical strength applications, shall conform to the requirements of SAE-AMS-F-7190 Grade A or SAE-AMS-A-22771.

4.2.1.2  Non-metallic components.  Non-metallic components shall be designed for minimum deterioration caused by abrasion, exposure to sunlight, microorganisms, moisture,

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