MIL-STD-2088 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

w/CHANGE 1

4.3.6 Reliability. Mission reliability for a BRU shall be a minimum of 0.99. Mission reliability is the probability that the BRU will successfully eject stores within specified mission parameters.

4.3.7 Shelf life. Shelf life of the BRU and all components shall be a minimum of five years and shall be refurbishable following the minimum shelf life specified. Exclusive of shelf life, the service life of the BRU shall be a minimum of 10 years. A maximum number of parts shall have an indefinite shelf life and a service life not less than that of the BRU.

4.3.8 Interfaces.

4.3.8.1 BRU to aircraft interface. The BRU to aircraft interface shall be dependent on aircraft design and airframe backup structure to distribute the BRU stores load. The BRU mounting shall optimize the aircraft performance envelope, minimize weight and drag, and utilize optimum load paths. Design shall be tailored to existing aircraft support structure and shall provide ease of installation and removal. Physical interfaces between the BRU and the aircraft shall be defined in terms of dimensions and tolerances. Functional interfaces shall include the support, service, and ejection functions. Electrical interfaces shall specify BRU power and signal requirements. All interface requirements shall comply with aircraft interface specifications.

4.3.8.2 BRU to store interface. Interface between the BRU and store shall include stores support, retention and the pre-release, release, and service functions. Physical interfaces 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- STD-46855, and the following additional requirements: