Technical data

Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D SHEET 95
SELF-TEST TERRAIN DISPLAY
During self-test, if all required inputs are valid then a display test pattern will be painted for approximately 12 seconds. The
test pattern, as illustrated in the Figure below, consists of 9 blocks, each filled with a different fill pattern and color. These 9
‘styles’ reflect those that are normally used in a terrain picture on the display being used.
Magenta
Low
Density or
Solid
Green*
Low
Density
Yellow
High
Density
Green*
Solid
Yellow
High
Density
Yellow
Solid Red
Black or
Low
Density
Cyan*
High
Density
Red
Figure 6.7-6: Self-Test Picture
NOTE: Styles indicated with a * vary depending on the status of the Peaks option
6.7.4.2 Terrain or Obstacle Caution Alert
When the conditions have been met to generate a terrain or obstacle caution alert, a specific audio alert and light output is
triggered and the background image is enhanced to highlight the threatening terrain.
At the start of a terrain caution alert, the Terrain Awareness function triggers the voice aural “Caution Terrain, Caution
Terrain” (or equivalent). The phrase is repeated after seven seconds if still within the terrain caution envelope. The Terrain
Awareness function responds to an obstacle caution alert by triggering the obstacle caution voice aural “Caution Obstacle,
Caution Obstacle”. The phrase is repeated after seven seconds if still within the terrain caution envelope.
During a terrain caution alert or obstacle caution alert the configured lights and 429 output bits are activated.
During a terrain caution alert, areas where terrain violates the terrain caution envelope along the aircraft track, and within
±90° of the aircraft track, are painted with the caution color yellow.
During an obstacle caution alert areas where an obstacle violates the terrain caution envelope along the aircraft track, and
within ±90° of the aircraft track, are painted with the caution color yellow.
6.7.4.3 Terrain or Obstacle Warning Alert
When the conditions have been met to generate a terrain or obstacle warning alert, a specific audio alert and light output is
triggered and the background image is enhanced to highlight the terrain or obstacle caution and warning threats.
At the start of a terrain warning alert, the Terrain Awareness function triggers the voice aural “Terrain Terrain, Pull Up”.
The phrase “Pull Up” is then repeated continuously while within the terrain warning envelope. The Terrain Awareness
function responds to a obstacle warning alert by triggering the obstacle warning voice aural “Obstacle Obstacle, Pull Up”.
The phrase is repeated continuously while within the terrain warning envelope.
During a terrain or obstacle warning alert the configured lights and 429 output bits are activated.
During a terrain warning alert, areas where terrain violates the terrain warning envelope along the aircraft track, and within
±90° of the aircraft track, are painted with the warning color red.
During an obstacle warning alert, areas where an obstacle violate the terrain warning envelope along the aircraft track, and
within ±90° of the aircraft track, are painted with the warning color red.