GRP  Geographic Reference Point 
GRP  Ground/Geographical Reference Point 
GRP  Glass-Reinforced Plastic 
GRP  Ground Reference Point 
GRU  Ground Refrigeration Unit 
GRV  Groove 
GRVTY  Gravity 
GS  Ground Speed 
GSB  Ground Service Bus 
GSE  Ground Support Equipment 
GSHLD  Glareshield 
GSM  General Structure Manual 
GSP  Ground Service Panel 
GTA  General Terms Agreement 
GTHRG  Gathering 
GTI  Ground Test Instructions 
GTR  Ground Test Requirement 
GUI  Graphic Interface Unit 
GW  Gross Weight 
GWDU  Galley Waste Disposal Unit 
GWR  General Working Rules 
GY  Grey 
GYRO  Gyroscope 
G/A  Ground-to-Air 
G/G  Ground Guidance 
G/S  Glide Slope 
H  Hot (Electrical Point) 
H  Runway Thickness 
h  Hour 
h  Height 
H NAV  Horizontal Navigation 
HA  Holding Pattern to an Altitude Termination 
HADC  Hybrid Air Data Computer 
HARN  Harness 
HAS  Heading and Attitude System 
HB  Brinnell Hardness Test Value 
hbar  Stress (Hectobar) 
HCU  Hydraulic Control Unit 
HCU  Head Up Combiner Unit 
HD  Head 
HD  Hold 
HDDA  Hard Disk Drive Array 
HDG  Heading 
HDG/S  Heading Selected 
HDL  Handle 
HDLG  Handling 
HDM  HSDU Data Module 
HDST  Headset 
HDWHL  Handwheel 
HEATG  Heating 
HEGS  Hydraulic Electrical Generating System 
HEX  Hexadecimal 
HF  Holding Pattern to a Fixed Waypoint 
HF  High Frequency 
HFDR  High Frequency Data Radio 
HGA  High Gain Antenna 

HHL  Horizontal Hinge Line 
HI  High 
HIBU  Hybrid Illumination Ballast Unit 
HID  High Intensity Discharge 
HIL  Hold Item List 
HK  Knoop Hardness Test Value 
HL  High Level