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

including safe-arm mechanisms shall be specified in terms of dimensions and tolerances under both static and dynamic conditions. Grounding and shielding shall be provided. All interface requirements shall comply with aircraft interface specifications.

4.3.8.3 Electrical grounding interface.

4.3.8.3.1 BRU to aircraft structure grounding. The BRU structure shall be electrically grounded to the aircraft structure through the physical, mechanical interface of the two structures. The preparation of the conducting path and choice of mating surfaces composition, material, and electrical characteristics shall be available to the procuring activity.

4.3.8.3.2 BRU internal ground interface. An isolated common ground pin for the BRU and weapon electrical components shall be provided in the BRU to which each aircraft power source ground shall tie. The power return wires shall be twisted with the supply wires and the twist should be approximately 155 twists per meter.

4.3.9 Human engineering. Human engineering shall comply with MIL-STD-1472, MIL-HDBK-46855, and the following additional requirements:

a. The BRU shall be operable and maintainable by a range of personnel from the 5th percentile female through the 95th percentile male, for critical body dimensions and strength characteristics, attired in personal and protective clothing and equipment. Anthropometric data for the 5th and 95th percentile armament ground crew shall be as specified in Natick TR-89/044.

b. The BRU shall be handled, serviced, and transported outside of the aircraft installation without any requirement for ancillary equipment, such as carriers, bolts, and crates.

c. Any positional indication and instructions located externally shall be flush with the general outside surface.

d. All normal BRU functional operations shall be performed without the use of special tools.

e. Ready access to functions, operations, and indications, such as, but not limited to, cartridge installation, pneumatic vessel installation, latching, loading, locking, and stray voltage checks shall be made available.

f. No components shall be accessible externally which would initiate accidental or inadvertent operation of the BRU.

g. All operation of the BRU shall require no greater than two people at any one time.