Abbreviations

List of abbreviations commonly used throughout this manual.

Abbreviation	Meaning
AEC	Auxiliary Engine Control
AC	Alternating Current
AOA	Angle Of Attack
AP	Autopilot
APU	Auxiliary Power Unit
AT	Autothrottle
DC	Direct Current
DDM	Degrees Decimal Minutes
DH	Decision Height
DTO	Direct To
DTL	Data Link
ECM	Electronic Counter-Measures
ECS	Environmental Control System
ECU	Engine Control Unit
EM	Electromagnetic
FADEC	Full Authority Digital Engine Control
FBW	Fly-by-wire
FCS	Flight Control System
FSO	Front Sector Optronics
GPU	Ground Power Unit
HCD	Head Center Display
HOTAS	Hands On Throttle-And-Stick
HSI	Horizontal Situation Indicator
HUD	Head-Up Display
IDF	IDentiFication
IFF	Identification, Friend or Foe
IMA	Imagery
INS	Inertial Navigation System
INU	Inertial Navigation Unit
IR	Infrared
IRST	Infrared Search & Track
LD	Lateral Display
LLD	Left Lateral Display
MFK	Multi-Function Knob
RDR	Radar
RLD	Right Lateral Display
SH	Safety Height
SITAC	TACtical SItuation
TACAN	TACtical Air Navigation
TTG	Time To Goal
VVI	Vertical Velocity Indicator
WPN	WeaPoN