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

use an independent driver for each of the two cartridges (see Figure 4). These drivers, when not activated, shall be capable of withstanding the transient voltages generated when the cartridge bridge wires burn open due to activation by the primary or secondary power source.

FIGURE 4. Wiring schematic to achieve primary and secondary release.

5.1.7.2.2 Cartridge firing pin. The cartridge firing pin configuration and characteristics shall be as follows:

a. Shank diameter of 0.092 ± 0.002 inch.

b. Point of 90° included angle with 0.005 inch diameter maximum flat. c. Hardness, Rockwell 59 to 62 HRC.

5.1.7.2.3 Cartridge breech. The diameter of the cartridge breech (or cartridge holder if used) shall be a straight bore of 1.081 + 0.003 - 0.000 inches over its full length. Any taper existing within these limits shall be uniform over the full length of the breech or cartridge holder, with the maximum diameter occurring at the end adjacent to the cartridge flange. The surface finish on the cartridge breech shall be a minimum of 32 microinches, root mean square (rms). Cartridge breech design shall provide cartridge firing pressure in the range of 3,000 to 25,000

PSI, with confinement of the cartridge main charge propellant for reproducible performance. The breech or cartridge holder shall be designed to permit "end burst" of the cartridge such that