MD-11 Flight Crew Operations Manual
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Warning and Alerting -
Description and Operation
Warn.10.19
Terrain alerting function continuously computes terrain clearance envelopes
ahead of the aircraft. This data is then compared with terrain elevation data stored
in the terrain database. If there is any conflict between the boundaries of these
envelopes, the terrain alerts are issued.
Terrain display is the basic presentation on the ND upon system power up. The
system displays a color-coded terrain map in MAP, VOR and APPR modes. The
displays can be replaced at any time with weather radar information by pushing
the WX BRT switch on the EIS control panel (ECP).
Terrain will be automatically displayed on the ND and neither Captain nor F/O has
terrain selected.
Terrain conditions are displayed and annunciated as follows:
• Terrain caution - Displayed in solid amber on ND, amber flashing
GROUND PROX on PFD, and voice warning CAUTION TERRAIN,
CAUTION TERRAIN.
• Terrain warning - Displayed in solid red on ND, red flashing GROUND
PROX on PFD, and voice warning TERRAIN, TERRAIN, PULL UP.
• Terrain that is close, but is not of warning or caution condition, is in
green, amber, or red dot patterns.
The following messages are displayed on the ND as applicable:
• TERRAIN (white) with selected range - Weather radar is deselected with
the WX BRT switch on the ECP.
• TERRAIN TEST (white) - Pilot-initiated preflight EGPWS test.
• TERRAIN RANGE DISAGREE (amber) - Display ranges on the NDs are
not the same.
Selected Warnings
2,500 feet voice.
1,000 feet voice.
500 feet voice.
400 feet voice.
300 feet voice.
200 feet voice.
100 feet voice.
10/20/30/40/50 voice warning - standard.
Altitude warning inhibit with landing flaps.
Altitude warning inhibit during FMS confirmed non precision approach.
TIRE FAIL voice inhibit during takeoff and landing.
November 10, 2008
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