H

H
h	Height
H	Hot (Electrical Point)
h	Hour
H NAV	Horizontal Navigation
H	Runway Thickness
H/W	Hardware
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)
HBCS	High Bandwidth Connectivity System
HC	Heater Circuit
HCS	Humidification Control System
HCU	Head Up Combiner Unit
HCU	Hydraulic Control Unit
HD	Head
HDDA	Hard Disk Drive Array
HDG	Heading
HDG/S	Heading Selected
HDL	Handle
HDLG	Handling
HDM	HSDU Data Module
HDMI	High-Definition Multimedia Interface
HDST	Headset
HDWHL	Handwheel
HEATG	Heating
HEGS	Hydraulic Electrical Generating System
HEPA	High Efficiency Particulate Air
HERTO	High Energy Rejected Takeoff
HES	Head End Server
HES	Head-End Switch
HESU	Head-End Server Unit
HEX	Hexadecimal
HF	High Frequency
HF	Holding Pattern to a Fixed Waypoint
HFDL	High Frequency Data Link
HFDR	High Frequency Data Radio
HFEC	High Frequency Eddy Current
HFP	Heated Floor Panel
HGA	High Gain Antenna
HHL	Horizontal Hinge Line
HHX	Hydraulic Heat Exchanger
HI	High
HID	High Intensity Discharge
HIDS	Host Intrusion Detection System
HIL	Hold Item List
HIP	Hot Isostatic Pressing
HK	Knoop Hardness Test Value
HL	High Level
HLAC	High Level AC Voltage
HLCL	Helical
HLD	High Lift Device
HLD	High Power Amplifier/Low Noise Amplifier/Diplexer
HLD	Hold
HLDC	High Level DC Voltage
HLDR	Holder
HLFC	Hybrid Laminar Flow Control
HLS	High Lift System
HLTY	Healthy
HM	Holding Pattern with a Manual Termination
HMC	Hydraulic Monitoring and Control
HMC	Hydromechanical Control
HMCA	Hydraulic Monitoring and Control Application
HMCRF	Hydraulic Monitoring and Control Remote Function
HMDU	Hatrack Mounted Display Unit
HMI	Human-Machine Interface
HMU	Hydromechanical Metering Unit
HMU	Hydromechanical Unit
HNDRL	HANDRAIL
HNG	Hinge
HO	Handover
HOLD	Holding
HOR	Hold Open Rod
HORIZ	Horizontal
HoS	Head of Step
HOT	High Oil Temperature
HP	High Pressure
Hpa	Hecto Pascal
HPA	High Power Amplifier
HPC	High Pressure Compressor
HPC	Rear Compressor Rotor and Stator Assembly
hPFD	harmonized Primary Flight Display
HPP	Hardware Pin Programming
HPR	High Power Relay
HPT	High Pressure Turbine
HPT	Rear Compressor Drive Turbine Rotor Assembly
HPTACC	High Pressure Turbine Active Clearance Control
HPTC	High Pressure Turbine Clearance
HPTCC	High Pressure Turbine Case Cooling
HPTCC	High Pressure Turbine Clearance Control
HPTR	High Pressure Turbine Rotor
HPU	Head up Projection Unit
HPV	HP Bleed Valve
HR	Hot Rolled
HR	Hour
HR(X)	Rockwell Hardness Test Value
HR/XXX)	Rockwell Superficial Hardness Test Value
HRP	Horizontal Reference Plane
HRS	Hot Rolled Steel
HRS	Hours
HRU	Highly Resistive Union
HS	High Speed
HSD	High Speed Data
HSDU	High Speed Data Unit
HSG	Housing
HSI	Horizontal Situation Indicator
HSI	Hot Section Inspection
HSMU	Hydraulic System Management Unit
HSMU	Hydraulic System Monitoring Unit
HSS	High Speed Steel
HST	High speed tape
HSU	HUD Sunvisor Unit
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
HUMIDIF	Humidification
HV	High Voltage
HV	Vickers Hardness Test Value
HVDF	High and Very High Frequency Direction - Finding Station
HVOF	High Velocity Oxygen-Fuel
HVPS	High Voltage Power Supply
HWBPT	Hardware Breakpoint
HXX	Hydraulic Heat Exchanger
HYD	Hydraulic
HZ	Hertz