AVIATION 261

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AVIATION 261

• HUD - Heads Up Display

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HUD - Heads Up Display

• Definition A Heads Up Display is an
  electro-optical device which displays flight
  information near the front windscreen so that the
  pilot can simultaneously monitor aircraft
  instruments and the outside environment.

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HUD - Components

• 4 Components
• 1 - Guidance Computer
• 2 - Overhead Unit
• 3 - Combiner
• 4 - Display Controller

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HUD - Guidance Computer

• Purpose
• - Calculates Flight Path Vectors
• - Converts Flight Director Information Into
  Flight Path Vectors
• - Creates Guidance and Symbol Generation
  Functions From the Pilot Selected Sensors. (Which
  are from the FMS)
• - Compares Information from the FMS and Displays
  a Blank Screen if a Failure is Detected.

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HUD - Guidance Computer
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HUD - Overhead Unit

• Purpose
• - Located above and behind the pilots head
• - Connected to the Combiner
• - Like a video projector, which projects the
  display onto the Combiner

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HUD - Overhead Unit
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HUD - Combiner

• Purpose
• - Fold away glass display.
• - The Overhead Unit projects the information on
  the Combiner.
• - Screen is coated so that it only reflects the
  green colour of the projected display.
• - Deployed and Stored using a release lever.

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HUD - Combiner

• Cont
• - Screen brightness controlled by a brightness
  control knob
• - Has two positions, Manual and Normal.
• -Manual display intensity is adjustable using
  knob
• -Normal display intensity automatically
  adjusts to the light changes detected by the
  ambient light sensor

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HUD - Combiner
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HUD - Display Controller

• Purpose
• - Used for both the HUD and the EFIS if
  installed.
• - When HUD is activated, the HUD functions are
  controlled by the controller.
• - Pilot can choose what information is displayed.

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HUD - Display Controller
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HUD - Display Possibilities

• Airspeed
• Heading
• Climb/Descent Rate
• Altitude
• Bank Angle
• A/Cs current Gs
• Angle of Attack

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HUD - Display Possibilities

• Flight Path Vector
• Approach Symbology
• - Glide Slope
• - Localizer
• - VOR etc.
• Symbolic Airport and Runway
• Flare Cue

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HUD - Display Possibilities

• Warnings
• -Windshear
• -TCAS II
• -Low Speed
• -EGPWS Messages

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HUD - Advantages

• Ease of transition from instruments to visual
• Easier to maintain an effective lookout while in
  a busy VFR area and TCAS II warning situation.
• Easier to monitor aircraft performance during a
  windshear overshoot.

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HUD - Disadvantages

• Screen can get cluttered causing a breakdown in
  the scan.
• Washout can occur where the screens symbology
  is difficult to see due to the background
  lighting.
• Caused by a very bright background such as a low
  sun or high intensity approach lighting, or by
  rapidly fluctuating background brightness.
• The screen cant be coloured like the Att. Ind.

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HUD - Future

• HUD connected to an infrared (EVS) sensor that
  can display images it sees through fog and cloud.
  
• Highways in the sky. The pilot is lead through
  the sky by images of electronic airways displayed
  on the HUD screen.

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HUD - Future

• HUD used for takeoff. The HUD is used in
  marginal weather to allow for safer takeoffs.
• -The runway centerline is displayed on the
  screen as well as certain other engine
  instruments and warning lights.
• -If a light goes off or an engine isnt
  performing properly, the pilot can recognize this
  faster and abort without ever taking his eyes off
  the runway.

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HUD - Future

• The takeoff HUD will only display certain
  warnings and lights depending on speed.
• If you are above V1, the warning lights will not
  be displayed on the screen and the pilot will not
  abort.
• HUD greatly improves low visibility approaches
  and will help support CATll and CATlll
  approaches.