plane.of.rotation,.no.matter.which.direct.ion.the. gyroscope.mount.is.turned.
HAD Hardware.Architecture.Document
“Halo” Means.there.is.a.thin.black.line.(halo).around. the.symbol.or.character..Haloing.is.used.when. appropriate.to.allow.characters.and/or.symbols.to. be.clearly.seen.when.they.are.displayed.against.a. solid.background.color.(Such.as.the.Sky/Ground).
HALT Highly.Accelerated.Life.Testing
HAMS Hot.Air.Management.System
HAP HGS.Annunciator.Panel
HARS High.Altitude.Route.System
HAT Height.Above.Touchdown
HC HGS.Computer
HCP (.1.).Head-Up.Control.Panel.
(.2.).HGS.Control.Panel
HCI Human.Computer.Interface
HCS Host.Computer.System
HCU HUD.Combiner.Unit
HCW Heavily.Cold.Worked.Pipe.and.Tube..
(Sean-Free.)
HDBK Handbook
HDD Head.Down.Display
HDG Heading:.The.angular.relation.of.the.longitudinal. axis.of.the.aircraft.with.respect.to.a.reference.. Magnetic.heading.is.referenced.to.magnetic. north..True.heading.is.reference.to.true.north.
HDGSEL Heading.Select
HDISK Hard.Disk
HDL Hybrid.Data.Link
HDLC High-Level.Data.Link.Control
HDLC-B High-Level.Data.Link.Control-Balanced
HDLMS Hybrid.Data.Link.Management.System
HDOP Horizontal.Dilution.of.Precision
HDOT Inertial.Vertical.Speed
HDP Hardware.Development.Plan
HE Altitude.Error
Heading The.direction.of.an.aircraft.path.with.respect.to.
magnetic.or.true.north.
HERF High Energy Radio Frequency Interference HF ( 1 ) High Frequency. The portion of the radio
spectrum.from.3.to.30.MHz..HF.communication.
systems.operate.in.the.2.to.30.MHz.portion.of.the.
spectrum...
(.2.).Human.Factors
HFDL High-Frequency Data Link
HFDM HF.Data.Modem
HFDR High Frequency Data Radio
HFNPDU High Frequency Network Protocol Data Unit
HFS High Frequency System
HFSG Human.Factor.Study.Group
HFSNL HF.Sub.Network.Layer
HGA High.Gain.Antenna
HGC Head-Up.Guidance.Computer
HGS (.1.).Head-Up.Guidance.System..
(.2.).HUD.Guidance.System
HHLD Heading.Hold HI High HIC (.1.).Head.Impact.Criteria.
(.2.).Head.Injury.Criteria
HIL Horizontal.Integrity.Limit
HIRF (.1.).High.Intensity.Radiated.Field.
( 2 ) High Intensity Radio Frequency
HLCS High.Lift.Control.System HLE Higher.Layer.Entity HLL High.Level.Language HM Health.Management HMF Health.Management.Function HMI Human.Machine.Interface HMOS High Density Metal Oxide Semiconductor HMU Height.Monitoring.Unit HO Handoff HOLD Holding.Pattern HOW Hand Over Word HP (.1.).High.Pressure..
(.2.).Holding.Pattern
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