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

all generated hot gases exit the cartridge through its closure disc and not the aluminum cartridge case. Means shall be provided at the end of the ejector piston cycle to safely vent the remaining gas pressure. To comply with a 0.008 man-hour (30-man second) cartridge removal and installation time for all cartridges of the BRU, provisions shall be made for quick installation of cartridges, rapid cap insertion and positive integral extraction of expended cartridges to facilitate unaided manual cartridge removal. System design shall provide for:

a. Internal cleaning without removal of BRU from the aircraft and without the use of special support equipment.

b. Breech removal and installation, for cleaning, at the organizational level, shall require a minimum of effort.

c. A means other than removal of components or movement of electrical connections to indicate cartridge installation.

d. A means other than removal to indicate an expended cartridge.

e. Breech cleaning shall be required only after 50 ejections or 30 days, whichever occurs first (see 4.3.11.4.1.1).

f. Firing pin to breech cartridge bore true positioning of 0.015 inch diameter. g. Full support of cartridge base upon installation and during firing.

h. Allowing for repeated installations, firing pin/cartridge electrode contact design shall maintain a force ranging from 40 pounds-force (lbf) to 100 lbf.

i. Preclude shorting to ground of electrode upon cartridge installation.

5.1.7.3 Pneumatic/hydraulic activated BRUs. A pneumatic/hydraulic activated BRU shall be powered by the pneumatic or hydraulic pressure stored in a pressure vessel. Various pressure vessel design configurations can be provided:

a. Integral or external to the BRU. b. Removable or fixed.

c. Rechargeable on ground (by replacement or direct charge) or in flight (through dedicated on-board pressure generation).

Whichever design is selected for the pressure vessel configuration, the vessel and ejector system shall be designed, but not limited, to the following requirements: