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┃   FLIGHT CREW OPERATING MANUAL ┃                        ┃          ┃          ┃
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TERRAIN AWARENESS AND DISPLAY
The Terrain Awareness and Display (TAD) function computes a caution and a warning
envelope in front of the aircraft, which varies according to aircraft altitude, nearest runway
altitude, distance to the nearest runway threshold, ground speed, and turn rate. When the
boundary of these envelopes conflicts with the terrain memorized in the database, the
system generates the relevant alert :
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┃Alert Level ┃Aural Warning   ┃ND (refer to 1.31.45) ┃Local Warning     ┃
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┃            ┃                ┃- Automatic terrain   ┃                  ┃
┃            ┃TERRAIN AHEAD,  ┃   display*           ┃                  ┃
┃Warning     ┃   PULL UP      ┃- Solid red areas     ┃  The pb light    ┃
┃            ┃                ┃- TERR AHEAD (red)    ┃   comes on,      ┃
┣━━━━━━╋━━━━━━━━╋━━━━━━━━━━━┫                  ┃
┃            ┃                ┃- Automatic terrain   ┃on each pilot's   ┃
┃Caution     ┃TERRAIN AHEAD   ┃   display pop-up*    ┃instrument panel  ┃
┃            ┃                ┃- Solid yellow areas  ┃                  ┃
┃            ┃                ┃- TERR AHEAD (amber)  ┃                  ┃
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When the TERR ON ND pushbutton is selected ON, and ARC or ROSE mode is
selected, the terrain is displayed on the ND. The terrain is displayed in various
densitites of green, yellow, red, or magenta, depending on the threat. (see 1.31.45,
INDICATIONS ON ND). If an alert is generated (caution or warning) when TERR ON
ND is not selected, the terrain will be automatically displayed and the ON light of
the TERR ON ND pushbutton will come on.
Note : I. When TERR ON AID is selected, the weather radar image is not displayed.
       2. The relative height of the aircraft is computed using the Captain's barD setting.
          Thus, the Terrain Awareness Display (TAD) does not protect against barD setting
             errors.
       3. The TAD and Terrain Clearance Floor (TCF) functions operate using the FMS I
          position. Thus, the system does not protect against FMS I position error.
If the crew identifies that navigation accuracy is low, then they must select the enhanced
modes off via the TERR pushbutton. The 5 GPWS modes remain active.
CCM ALL
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┃I  -~ A318                      ┃NAVIGATION  ┃1.34.70     P 9       ┃
　
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