AIRCRAFT ABBREVIATIONS

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h Height
h Hour
hbar Stress (Hectobar)
H Hot (Electrical Point)
H Runway Thickness
H NAV Horizontal Navigation
Hpa Hecto Pascal
HA Holding Pattern to an Altitude Termination
HADC Hybrid Air Data Computer
HARN Harness
HAS Heading and Attitude System
HB Brinnell Hardness Test Value
HCU Hydraulic Control Unit
HD Head
HDG Heading
HDG/S Heading Selected
HDL Handle
HDLG Handling
HDST Headset
HDWHL Handwheel
HEGS Hydraulic Electrical Generating System
HEX Hexadecimal
HF High Frequency
HF Holding Pattern to a Fixed Waypoint
HHL Horizontal Hinge Line
HI High
HIL Hold Item List
HK Knoop Hardness Test Value
HL High Level
HLAC High Level AC Voltage
HLCL Helical
HLD Hold
HLDC High Level DC Voltage
HLDR Holder
HLTY Healthy
HM Holding Pattern with a Manual Termination
HMC Hydromechanical Control
HMU Hydromechanical Unit
HNG Hinge
HOLD Holding
HORIZ Horizontal
HOT High Oil Temperature
HP High Pressure
HPA High Power Amplifier
HPC High Pressure Compressor
HPC Rear Compressor Rotor and Stator Assembly
HPT High Pressure Turbine
HPT Rear Compressor Drive Turbine Rotor Assembly
HPTACC High Pressure Turbine Active Clearance Control
HPTC High Pressure Turbine Clearance
HPTR High Pressure Turbine Rotor
HPV HP Bleed Valve
HR Hot Rolled
HR Hour
HR(X) Rockwell Hardness Test Value
HR/XXX) Rockwell Superficial Hardness Test Value
HRS Hot Rolled Steel
HRS Hours
HS High Speed
HSG Housing
HSI Horizontal Situation Indicator
HSI Hot Section Inspection
HSMU Hydraulic System Monitoring Unit
HSS High Speed Steel
HT Heat
HT TR Heat Treat
HTD Heated
HTG Heating
HTP Horizontal Tail Plane
HTR Heater
HUD Head Up Display
HUDC Head Up Display Computer
HV High Voltage
HV Vickers Hardness Test Value
HVDF High and Very High Frequency Direction - Finding Station
HVPS High Voltage Power Supply
HWBPT Hardware Breakpoint
HYD Hydraulic
HZ Hertz
H/W Hardware
HCS Humidification Control System
HDDA Hard Disk Drive Array
HDM HSDU Data Module
HEATG Heating
HES Head-End Switch
HESU Head-End Server Unit
HFDR High Frequency Data Radio
HFEC High Frequency Eddy Current
HGA High Gain Antenna
HID High Intensity Discharge
HIDS Host Intrusion Detection System
HMDU Hatrack Mounted Display Unit
HMI Human-Machine Interface
HOR Hold Open Rod
HPR High Power Relay
HPTCC High Pressure Turbine Case Cooling
HPU Head up Projection Unit
HRP Horizontal Reference Plane
HSDU High Speed Data Unit
HUMIDIF Humidification
HXX Hydraulic Heat Exchanger
HCU Head Up Combiner Unit
HLD High Power Amplifier/Low Noise Amplifier/Diplexer
HMU Hydromechanical Metering Unit
HSMU Hydraulic System Management Unit
HEPA High Efficiency Particulate Air
HFP Heated Floor Panel
HHX Hydraulic Heat Exchanger
HPP Hardware Pin Programming
HSD High Speed Data
HSU HUD Sunvisor Unit
HPTCC High Pressure Turbine Clearance Control

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