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

5.1.9.8 Hazards of electromagnetic radiation to ordnance (HERO). As required by the statement of work or the purchase specification, the BRU system shall meet the HERO requirements of MIL-STD-464 (STANAG 3575 AA).

5.1.9.9 Coupling factor (CF). The BRU shall be considered a potential coupling device which may provide entry for excessive Radio Frequency (RF) energy from the external environment, through the BRU into the remainder of the weapon system and possibly the entire aircraft system. The BRU shall utilize shielding, filtering or such other EMI suppression techniques as may be required to ensure that the external electromagnetic (EM) environment shall not be coupled through the BRU. The external EM environment shall be specified in

MIL-STD-464.

5.2 Electrical requirements.

5.2.1 General. The BRU shall conform to the following electrical requirements stated herein. Additionally, all signals shall conform to the E3 requirements of 5.1.9. The BRU designer shall utilize all or a subset of the signals in the paragraphs listed.

5.2.2 BRU structural ground. The BRU shall provide a conductive path from metallic parts of its outer skin to the BRU support structural interface.

5.2.3 Nose arm. This aircraft signal is the primary signal to the arming unit solenoid located in the front of the BRU. Activation of this signal shall cause the forward arming solenoid to activate and retain the forward mechanical arming wire upon store release. This function shall operate from a nominal 28 VDC/open discrete as specified in MIL-STD-704, normal operation voltage range, and shall not require greater than 0.250 ampere on a continuous basis.

5.2.4 Center arm. If required, this aircraft signal is the primary signal to the arming unit solenoid located in the center of the BRU. Activation of this signal shall cause the center arming solenoid to activate and retain the center mechanical arming wire upon store release. This function shall operate from a nominal 28 VDC/open discrete as specified in MIL-STD-704, normal operation voltage range, and shall not require greater than 0.250 ampere on a continuous basis.

5.2.5 Tail arm. This aircraft signal is the primary signal to the arming unit solenoid located in the rear of the BRU. Activation of this signal shall cause the aft arming solenoid to activate and retain the aft mechanical arming wire upon store release. This function shall operate from a nominal 28 VDC/open discrete as specified in MIL-STD-704, normal operation voltage range, and shall not require greater than 250 milliamperes on a continuous basis.