unmanned Air vehicle aerial photographic system
mixed charging vehicle technique
vehicle technique support
Air Leakage Rate of Air Preheater
air to air heat recovery unit
air to air missile launching envelope
arctic air [= arctic air mass]
continental air [= continental air mass]
main air port exhaust air
marine air [= marine air mass
variable air volume (VAV) air conditioning system
variable air volume air conditioning system
500 kV unmanned substation
anti-radiation unmanned aerial vehicle
Miniature Unmanned Aerial Vehicle