S: Servicing
S: Sierra
S: South
S: Stern
S of AN: School of Air Navigation
S of TT: School of Technical Training
S&TT: Station & Target Towing
S.O.S: School of Signals
S/A: Selective Availability
S/C: Sergeant Chef
S/C: Step Climb
S/D: Step Descent
S/F: Slats/Flaps
S/L: Squadron Leader
S/Ldr: Squadron Leader
S/N: serial number
S/O: Second Officer
S/R: Service Request
S/S: Staff Sergeant
S/V: Shop Visit
S2: Air Sahara
SA: Sand
SA: South African Airways
SAA: Small Arms Association
SAAF: South African Air Force
SAALC: San Antonio Air Logistics Center
SAC: Senior Aircraftman
SACEUR: Supreme Allied Commander Europe
SACL: Sydney Airports Corporation Limited
SACS: Software Avionics Command Support
SAE: Society of Automotive Engineers
SAEPP: Sophicated Aero Engine Performance Program
Saf: Safety
SAFIRE: Service des Avions Français Instrumentés pour la Recherche en Environnement
SAFU: South Atlantic Ferry Unit
SAGM: Surface to Air Guided Missile
SAGW: Surface to Air Guided Weapon
SAI: Standby Attidude Indicator
SAIL: Shuttle Avionics Integration Laboratory
SAL: Shuttle Avionics Laboratory