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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5.1.4.3  Positive arming attachment.  Unless otherwise specified by the procuring activity, a minimum of four (Type I and II BRU) or two (Type III BRU) positive arming attachments shall be provided.  They may be located on both sides, or one side, of the BRU along its entire length (longitudinal axis) as shown on Figures 1 and 2.  The location of the positive arming attachments with installed arming wires shall not interfere with BRU functions such as the operation of the mechanical fuze AUs, ejector pistons, and swaybraces.  The procuring activity shall determine

the maximum number of positive arming attachments.  The positive arming attachment spring latch assembly shall be as specified on NAVSEA drawing 2263759, or an equivalent hard point shall be provided.  The axis of the latch shall be located approximately 1 inch above the uppermost surface of the store body and attached to the side of the BRU.  The positive arming attachments shall be positioned in a manner to preclude opening in flight from aerodynamic loading.  If the BRU is required by the procuring activity to provide an electrical fuze AU (see

5.1.4.2), then one positive arming attachment shall be positioned at the location specified in

Note 5 of Figures 1 and 2.

5.1.5  Swaybraces.  Automatic, semi-automatic, or rapid activating BRU swaybraces shall be provided for all stores after independent activation of both vertical supports supporting the store.  Swaybraces shall be located symmetrically about vertical supports as shown on Figures 1 and 2 and laterally within the reinforcement area of MIL-STD-8591 (STANAG 3575 AA).  The swaybraces shall be capable of reacting the design loads without the use of adapters.  For standardization purposes, as a minimum, the swaybraces and related BRU systems shall accommodate store diameters as specified in table II.

TABLE II. Suspension diameters.

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