A - Discounted First booking class 
A&GS - Armament & Gunnery School 
A&IEU - Armament & Instrument Experime… 
A&L - Approach and Landing 
A&P - Airframes and Powerplant 
A-S - Anti-Spoofing 
A-SMGCS - advanced surface movement gu… 
A.C.R.C - Aircrew Receiving Centre 
A.N.D. - Aircraft Nose Down 
A.N.U. - Aircraft Nose Up 
A/BRK - Auto brake 
A/C - Air Conditioning 
A/C - Aircraft 
A/Cdre - Air Commodore 
A/D - Analog to Digital 
A/D - analog/digital 
A/F - Auto Flight 
A/G - Air/Ground 
A/J - Anti-Jamming 
A/N - Alphabetical/Numerical 
A/P - Auto-Pilot 
A/R - Approved/Repairs 
A/R - Audio Reproducer 
A/S - Airspeed 
A/S - antisubmarine 
A/S - Auto Stabilization 
A/SKID - Anti Skid 
A/T - Adjustment/Test 
A/T - Auto Throttle 
A/T - Auto-Throttle