H
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H Hungary
H, h Hour
H/M/L High/Medium/Low (ATC Complexity)
H16 Hours 16, Availability 16 hours/day, 7 days/week
H24 Hours 24, Availability 24 hours/day, 7 days/week
HA High Availability
HA Holding to an Altitude (ARINC 424 Path Terminator)
HAD Human Aspects Development
HADAMARD Multi-radar processing written in ADA
HAI Helicopter Association International
HALO High Altitude, Low Opening
HALS / DTOP High Approach Landing System / Displaced Threshold Operations
HAMMER High-level All-purpose Monitoring and Management Equipment for RADNET
HAT Height Above Touchdown *
HATR Hazardous Air Traffic Report
HAW Horizontal Aid Window (ODID)
HBS Hotline Back-up System
HCA Human-Centred Automation
HCAA Hellenic Civil Aviation Authority
HCD Hard Copy Device
HCI Human Computer Interface/Interaction
HCP Hard Copy Printer
HCT Human-Computer Trust
HD Harmonisation Documents
HD Help Desk
HDB Historical Data Base (ODS)
HDBK Handbook
HDD Head Down Display
HDG Heading *
HDLC High Level Data Link Communication
HDLC High Level Data Link Control Protocol * (RADNET)
HDOP Horizontal Dilution of Precision *
HDS Help Desk Staff
HED Heading *
HEI Human Error Identification
HEIDI Harmonisation of European Incident Definitions Initiative for ATM (SQS)
HEL High Energy Laser
HELLANET Hellenic aeronautical Network
HEO Highly inclined Elliptical Orbit
HEP Human Error Probability
HEP Horizontal Expansion Programme
HERA Human Error in ATM *(Project)
HERAS Hellenic Radar System
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HERMES Harmonised En-Route Metering and Spacing (Sequencing)
HESSD Human Error, Safety and Systems Development
HEX Horizontal Expansion (of 8.33 kHz deployment)
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