MIL-STD-1289D
4.3.4 Fuze clearance.
For stores that ordinarily are made safe by removal of fuzes, adequate clearance shall be provided to remove or install fuzes on the loaded store without removing the stores from their loaded positions.
4.3.5 Minimum ground clearance.
The minimum clearance required between the ground and the maximum composite envelope of all stores carried externally differs from each of the three services, as does the method of establishing the aircraft configuration prior to measurement. Weapon designers should strive for a maximum degree of interoperability between services when developing new weapons, and the service clearance criteria which provides the most critical case should be used whenever possible. Specific requirements for each service are as follows:
a. The Army requires a 152.4 mm (six inch) ground clearance in the worst-case condition of flat tire(s) and depressed strut(s), with the aircraft in either a static, takeoff, or landing attitude at maximum allowable gross weight.
b. The Navy requires a 152.4 mm (six inch) ground clearance with tires flat and depressed struts with aircraft in either a static, takeoff, or landing attitude.
c. The Air Force requires a minimum ground clearance of not less than 76.2 mm (three inches), 152.4 mm (six inches) for aircraft designed to operate on rough terrain, in the worst condition of flat tire(s) and completely depressed strut(s), with the aircraft in either a static, takeoff, or landing attitude. (For example, centerline stores mounted aft of the main landing gear require both main landing gear tires flat and struts compressed to simulate the worst-case ground clearance.)
4.3.6 Landing gear clearance.
A minimum clearance of 25.4 mm (one inch) shall be provided between all stores and any portion of the aircraft landing gear. This clearance shall apply both to the landing gear down and locked position as well as throughout the entire retraction and extension cycle.
4.3.7 Engine heat, jet, and munitions blast clearance.
Adequate insulation shall be provided to protect stores from engine heat. Permissible store temperatures shall be those of the ordnance specification. Adequate clearance for exit cone blast or muzzle blast shall be provided to protect adjacent stores from either blast or corrosive damage.
4.3.8 RAM air turbine clearance.
A minimum clearance of 25.4 mm (one inch) shall be provided to prevent contact between stores and deployed or extended RAM air turbines. An assessment shall be made as to the possibility of the store adversely affecting the performance of the RAM air turbine.
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