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

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4.3.3 Structural load requirements. Load analyses shall be conducted to determine the design loads.

4.3.3.1 Take-off and landing loads. The BRU shall withstand the maximum loads imposed by catapult take-off and arrested landing in accordance with MIL-STD-8591. Applicable inertial acceleration limits and loads shall be developed.

4.3.3.2 Captive flight loads. The BRU shall be designed for the maximum aerodynamic and inertial loads acting on the store and BRU throughout the captive flight Mach-altitude envelope of the aircraft (minimum store configuration). The design captive flight envelope and the inertial acceleration levels of the most severe aircraft/weapon station shall be used to develop worst-case BRU design loads in accordance with MIL-STD-8591.

4.3.3.3 Launch loads. The BRU shall be designed for the maximum aerodynamic and inertial loads acting on the store and BRU throughout the specified launch Mach-altitude envelope of the aircraft (minimum store configuration). Combined BRU loads shall include BRU ejector forces and the structural dynamic interactions which occur at store separation.

4.3.3.4 Jettison loads. The BRU shall be designed to withstand the combined effect of maximum ejection forces and the aerodynamic and inertial forces acting on the store/BRU combination over the specified jettison envelope.

4.3.3.5 Cyclic loads. The BRU shall be capable of withstanding the cyclic application of combined limit loads imposed upon it over the course of its specified life. The cyclic load spectra shall include the effects of specified environments and a minimum of 500 launches.

4.3.4 Stress analysis. A stress analysis shall be accomplished by using the loads generated in accordance with 4.3.3. Calculated margins of safety less than 0.33 for cast items shall be demonstrated by structural test. Critical margins of safety shall be made available to the procuring activity.

4.3.5 Service life. The BRU design objective shall be to meet or exceed an economically maintainable service life of: "a" flight hours, or "b" ejections, or "c" operating hours, or "d" operating cycles, whichever occurs first. An economically maintainable service life is exceeded when the cost to repair the BRU is greater than one-half the replacement cost.

"a" - 6,000 or as specified by the procuring activity "b" - 500 or as specified by the procuring activity "c" - 9,000 or as specified by the procuring activity "d" - 2,000 or as specified by the procuring activity