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

maximized for ease of replacement with minimum requirements for special skills. The module replacement concept shall be employed.

4.3.11.1 Maximum maintenance time. With the BRU removed from the aircraft, the design shall provide for a mean-time-to-repair (MTTR) the BRU of one hour and a two hour maximum to include fault isolation to the component level, replacement of the failed component, and checkout.

4.3.11.2 Ejector system maintainability.

4.3.11.2.1 Pyrotechnic BRU. If impulse cartridges are used as release and ejection energy sources, the BRU design shall provide for:

a. Internal breech cleaning without removal of BRU assembly from the aircraft and without the use of special support equipment. BRU breech component removal shall be minimized to facilitate cleaning at the organizational maintenance level.

b. Breech installation and removal with a minimum of maintenance effort.

c. A means other than removal of the breech cap or movement of the electrical connection to indicate cartridge installation.

d. A positive retention feature shall be provided to maintain cartridge containers/breech caps in a secure position during flight.

4.3.11.2.2 Pneumatic or hydraulic BRU.

4.3.11.2.2.1 Pressure vessel. If a pressure vessel is used as the release/ejection energy source, its design shall provide for:

a. A visual indication of the internal pressure level (not dependent on electrical power availability).

b. A means to manually relieve the vessel internal pressure.

4.3.11.2.2.2 Removable pressure vessel. If a removable pressure vessel is used as the release/ejection energy source, its design, in addition to the previous requirements, shall comply with the following requirements:

a. It shall be possible to install/remove the vessel without using special tools.

b. It shall be possible to install/remove the vessel with the store fully latched to the BRU.