MIL-STD-1289D
4.3.2.5 Store ejection clearance.
A minimum of 25.4 mm (one inch) clearance shall be provided for any movable surface or component of an ejected store during ejection to the point of closest proximity to any other store, launcher, pylon, or aircraft surface. This clearance shall be verified by actual testing or by analysis approved by the procuring agency.
4.3.2.6 Intake duct clearance.
An assessment shall be made to determine whether or not the store installation could cause engine compressor stall or flameout as a result of exhaust, shock, gasses or pressure wave interference. The degree of probability of ingestion of fahnstock clips, wire, spent cartridge brass, or other debris in the airstream from store separation shall be noted. The clearance required as a result of the assessment shall be verified on ground.
4.3.2.7 Store arming control system clearance.
Adequate clearance must be provided to ensure correct operation of the arming control system during separation. The store arming control system (such as arming loops, swages, or connectors) shall not become jammed or caught on the aircraft, pylon, launcher, or ejector rack to prevent inadvertent initiation of the store arming sequence. Upon store release, clearance shall exist to ensure remaining elements of the store arming control system do not adversely affect aircraft surfaces or systems.
4.3.2.8 Propeller and rotor disk clearance.
a. Guns: On propeller and rotor-equipped aircraft, a minimum clearance of 152.4 mm (six inches) between the worst-case propeller/rotor disk position or any part of the aircraft and the bullet trajectory (bullet trajectory should be the worst-case position in the firing envelope and the worst-case gun dispersion) shall be provided.
b. Rockets/missiles: The clearance during launch for guided and unguided rockets and missiles shall be a five-degree half angle cone measured from the trajectory of the outermost surface of the ordnance to the worst-case rotor plane or aircraft structure. The definition of a five-degree half-angle cone is depicted on figure 1. Clearance shall be sufficient to preclude induced damage from spent cases or any loose items under a worst case release condition. (The worst case rotor plane cannot always be located accurately in a static condition and should also be measured in a dynamic situation.)
4.3.2.9 Clearance for missile tubes.
Sufficient clearance shall be provided between adjacent missile tubes on a multi-tube launcher. Clearance shall assure that activation/firing of one missile will not adversely affect or damage the adjacent missile or the environmental cover of an adjacent tube. Clearance between a missile tube and the aircraft surface should be covered by 4.3.2.1. Clearance between two missile tubes on adjacent launchers should be covered by 4.3.2.2.
4.3.3 Internal store clearances.
4.3.3.1 Store to aircraft clearance.
A minimum clearance of 25.4 mm (one inch) shall be provided between all required stores and aircraft bay structure, hydraulic equipment, electrical equipment, fuel lines, and any other equipment attached to the aircraft bays which the stores could contact during captive
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