TM 1-1520-238-10
B-8
Change 9
Appendix B – Abbreviations and Terms (cont)
HBCM
Hover Bias Calibration Mode
HDG
Heading, Heading Set
HE
High Explosive
HF
High Frequency, Hellfire
HIGE
Hover In Ground Effect
HIT
Health Indicator Test
HMD
Helmet-Mounted Display
HMMS
Hellfire Module Missile System
HMS
Helmet-Mounted Sight
HMU
Hydromechanical Unit
HOGE
Hover Out of Ground Effect
HOV
Hover
HSI
Horizontal Situation Indicator
HSP
Hot Start Preventor
HT
Heat, Heater, Height
HTR
Heater
HYD
Hydraulic
Hz
Hertz
I
IAS
Indicated Airspeed
ICS
Intercommunication System, Internal Communication System
IDENT
Identification
IFF
Identification Friend or Foe (transponder)
IFR
Instrument Flight Rules
IGE
In Ground Effect
IGN
Ignition
