What does HDD stand for?

Head Down Display

This definition appears very rarely and is found in the following Acronym Finder categories:

Military and Government

Other Resources:

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High-Dose Cytotoxic Therapy Hybrid Discrete Cosine Transform Harbor Defense Command Unit (Naval Coastal Warfare commissioned reserve unit) Human Diploid Cell Vaccine High Density Chemical Vapor Deposition Hammer Debounce Device (airguns) Hard Decision Decoding Hard Disk Drive Hardware Design Document Harry the Dirty Dog (book)		Head-Down Display Health Data Dictionary Hearing Dogs for the Deaf (UK) Heating Degree Days (weather derivatives / insurance index converting temperature into prices) Heavy-Duty Diesel Hickory Dickory Dock (nursery rhyme) Hierarchical Data Dictionary High Density Data High Density Diskette Highly Doped Drain

Samples in periodicals archive:

The EVS provides an image on the Head Up Display (HUD), a Head Down Display (HDD) or both to enable the pilot to see the terrain/airport environment in low visibility situations.

Travel Safety Update - North America

The Rockwell Collins Head Down Display Center (HDDC) will develop and produce the product.

United States: BAE SYSTEMS selects Rockwell Collins displays for FCS ...

Work on the avionics systems includes the Sparrow Hawk Head Up Display (Hud), an FV-300 Mission Display Processor System and a customised head down display.

Avionic upgrade nears completion

Current flight deck head down display media is constrained by available cockpit space, while head up display media is constrained by horizontal and vertical field-of-view and the lack of full color capability.

Microvision Awarded $1.9 Million NASA Development Contract for ...

Expanding their product offerings from head down displays to Microvision's revolutionary head-up 'out the window' display is a natural progression and part of AvroTec's overall corporate roadmap," said Bruce Westcoat, Microvision's market manager for general aviation.

Microvision Signs AvroTec as General Aviation Reseller

The runway lights are observed through the fog and the background scene is observed and displayed on the Head Up or Head Down display.

Enhanced Vision System Flight Tests to Begin On the Gulfstream V