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

3.6  Gravity release.  The mode wherein an aircraft store is intentionally separated from aircraft suspension and release equipment and the applied separation force is the force of gravity only.

3.7   Latch.  Those mechanisms that engage the BRU vertical supports to retain the store.

3.8   Loading.  An operation that installs aircraft stores on the aircraft.

3.9  Operating cycles.  The number of store loading/off-loading events, including manual.

3.10  Operating hours.  The number of hours accumulated in a status implying a degree of stress or an active operating condition (i.e. store restraint for mechanical components, generation of/being subjected to electric or electromechanical forces for electrical and electromechanical components, pressurization for pneumatic or hydraulic components, etc.).

3.11  Pressure vessel.  A storage tank or container that has been designed to operate with a liquid (e.g. hydraulic fluid) or gas (e.g. air) under pressure greater than atmospheric pressure.

3.12  Primary release.  The principal provision for safe separation of stores or suspension items (or both) from the aircraft.

3.13  Proof pressure.  Design test pressure aimed to verify the functional and structural integrity of the pressure system.  Neither permanent deformation nor leakage is allowed when proof pressure is applied.

3.14  Secondary release.  The emergency provision for safe separation of stores or suspension items (or both) from the aircraft.

3.15  Single point safetying.  Changing from a state of readiness for initiation to a safe condition from one location.

3.16   Swaybracing.  That mechanism within the physical tri-axial restraint system which partially or totally reacts to store yaw and pitching moment in addition to vertical and lateral store loads.

3.17  Vertical supports.  The structural mating members of the BRU to the store. Typically hooks have been used to accomplish this function.

4.    GENERAL REQUIREMENTS

4.1  BRU types.  Carriage characteristics of BRU types are shown in Table I.

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