Use Environment per MIL HDBK-217F (Airborne):
Airborne, lnhabited, Cargo: Typical conditions in cargo compartments which can be occupied by an aircrew. Environment extremes of pressure, temperature, shock and vibration are minimal. Examples include long mission aircraft such as the C130, C5,B52, and C141. This category also applies to inhabited areas in lower performance smaller aircraft such as the T38.
Airborne, Inhabited, Fighter: Same as AIC but installed on high performance aircraft such as fighters and interceptors. Examples include the F15, F61, F111 , FIA 18 and A10 aircraft.
Airborne, Uninhabited, Cargo: Environmentally uncontrolled areas which cannot be inhabited by an aircrew during flight. Environmental extremes,of pressure, temperature and shock may be severe. Examples include uninhabited areas of long mission aircraft such as the C130, C5A , B52 and C141, This category also applies to uninhabited area of lower performance smaller aircraft such as the T38.
Airborne, Uninhabited, Fighter: Same as AUC but installed on high performance aircraft such as fighters and interceptors. Examples include the F15, F16, F111 and A10 aircraft.
Airborne, Rotary Winged: Equipment installed on helicopters. Applies to both internally and externally mounted equipment such as laser designators, fire control systems, and communications equipment.
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Ground Environments, Naval Environments, Space Environments
Mean Time Between Failure Definition .... Military Specifications
