MIL-STD-1289D
4.3 Clearances.
Minimum clearances specified below (measured during static ground fit tests) are intended to ensure adequate clearance during worst-case dynamic in-flight maneuvers. A summary of the clearances required for the aircraft/store combination is included in Appendix A for use during the test.
4.3.1 Loading clearance.
Sufficient clearance shall be provided to enable movement of the store into position when the aircraft is fully serviced and is in its normal attitude on a normal landing or servicing surface. It is desirable that sufficient clearance be provided to allow loading/unloading at maximum aircraft gross weight with tires flat and struts fully compressed. For the purpose of determining this clearance, use of common armament weapons support equipment shall be assumed unless peculiar armament weapons support equipment is designated for use with the store or aircraft. See MIL-I-8671 for additional information.
4.3.2 External store clearances.
4.3.2.1 Store to aircraft clearance.
A minimum clearance of 25.4 mm (one inch) shall be provided between all required stores and aircraft surfaces (including hoisting equipment, flaps, dive brakes, ailerons, elevators, rescue hoists, etc.) with the surfaces deflected to the point of the closest proximity to the store. For aircraft with variable wing geometry, the worst-case wing sweep angle shall be used to determine minimum clearance.
4.3.2.2 Store to store clearance.
A minimum clearance of 25.4 mm (one inch) shall be provided between adjacent stores noting that additional clearance may be required for fuze clearance (see 4.3.4) with stores mounted on the aircraft stores suspension equipment. For stores configured in tandem, this distance shall be measured from the plane tangent to the rear most surface of the forward store to the closest surface of the aft store or fuze to ensure clearance during separation (see 4.3.2.4 and 4.3.2.5). The clearance shall be maintained with any movable surface or component of the store that is normally free or controlled to move while the store is in its installed position, or deflected to the point of closest proximity to the adjacent store.
4.3.2.3 Store to pylon clearance.
A minimum clearance of 12.7 mm (one-half inch) shall be provided between any component along the length of the store and pylon on which it is suspended. An exception to this rule can be made for suspension lugs, store sensing switches, sway bracing, and bomb charging well electrical power generator components provided that careful review/analysis is performed to ensure sufficient clearance.
4.3.2.4 Rail launched stores clearance.
A minimum of 25.4 mm (one inch) clearance shall be provided between any movable surface or component of a rail launched store that is free or controlled to move during launch with the surface deflected to the point of closest proximity to any other store, launcher, pylon, or aircraft surface.
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