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

5.1.1 Support Equipment (SE). The BRU shall be designed to be installed, tested, serviced, and maintained using standard support equipment and hand tools. Use of common hand tools shall be maximized. All support equipment shall be identified and grouped by maintenance level (organizational and intermediate).

5.1.2 Store vertical support. The BRU vertical support system shall consist of 14-inch or

30-inch vertical supports to accommodate stores up to 5000 lbs for two-piston BRUs (U.S. Air Force and U.S. Navy), or up to 2000 lbs for single-piston BRUs (U.S. Army), through the interfaces specified in MIL-STD-8591. The vertical supports shall be located as shown on

Figures 1 and 2 for two-piston BRUs and Figure 3 for single-piston BRUs. BRU lower surface to store upper surface clearance shall be as specified in MIL-STD-8591 (STANAG 3575). For

non-ejected stores, the BRU vertical support system shall consist of a single vertical support, as shown on Figure 4, or vertical supports spaced at 14 inches as shown on Figures 1, 2, and 3.

5.1.2.1 Vertical support latching. Latch mechanisms shall be used to secure the vertical supports in their captive positions. The engagement of the vertical support latches shall be automatic as the store suspension lugs engage the vertical supports, and each latch shall independently engage its vertical support as the store is loaded onto the BRU. The latch mechanism design shall incorporate a latch drive that will force the latch mechanism from its LATCHED to UNLATCHED positions. The latch drive shall operate as part of the normal aircraft release operation or be manually driven during loading or downloading of stores. Latches shall dependently and simultaneously disengage all vertical support during store release operations. After store release, the vertical supports and latch mechanisms shall automatically engage and latch during the next store loading operations without additional actions of the loading crew. Vertical supports and latches shall be designed so that they will not latch unless the vertical supports are properly placed in their captive positions. The BRU vertical supports

and their latching mechanisms shall be designed such that the vertical supports are either latched or unlatched and cannot be placed in an in-between state where the vertical supports are partially latched. The latch mechanism shall provide a positive indication of its latched or unlatched state and shall not be capable of providing a false latched indication. The latch state indicator shall be visually discernible on both sides of the BRU without requiring power. The latch and latch drive shall be designed to operate with the functions of the safety interlock and its drive mechanism. The latch mechanism design shall not be susceptible to inadvertent release due to the failure of a single component. Vertical supports and their latching mechanisms shall be designed to be functionally insensitive to manufacturing and assembly tolerances, wear, normal misuse during handling, aircraft induced loads and vibration, and contamination build-up on their surfaces. The force required to latch each vertical support and engage its latching mechanism shall be not greater than 25 pounds per vertical support for Type I and Type III BRUs and 50 pounds per vertical support for Type II BRUs. A permissible alternative to the latching-hook vertical support(s) for Type III BRUs shall be a frangible attachment point.