MD-11 Flight Crew Operations Manual
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Warning and Alerting -
Description and Operation
Warn.10.16
• Mode 2A - This mode is applied when the landing flaps are not down and
the aircraft is not on the glideslope. Upon penetration, the amber
GROUND PROX message is activated and a voice warning TERRAIN -
TERRAIN sounds. If the condition persists, the voice warning PULL UP
will be announced. The upper boundary of the alert envelope varies as the
airspeed increases from 220 kts to 310 kts.
• Mode 2B - Enables for three conditions: landing flaps are set for landing,
aircraft is on the glideslope during an ILS approach, or the aircraft is in
the first 60 seconds after takeoff. When the aircraft penetrates the alert
envelope with either gear or flaps not in landing configuration, the amber
GROUND PROX message is activated on the PFD and the voice warning
TERRAIN TERRAIN is generated. If the condition persists, the voice
warning PULL UP will be generated. If the aircraft penetrates the alert
envelope with both gear and flaps in landing configuration, the voice
warning TERRAIN is repeated until the envelope is exited.
Mode 3 - Altitude Loss After Takeoff
Provides a warning for significant altitude loss after takeoff or after a go-around
from below 245 feet AGL with gear up and flaps are not in the landing
configuration. Penetration of the boundary will result in the amber GROUND
PROX message activated on the PFD and a voice warning DON'T SINK.
Mode 4 - Unsafe Terrain Clearance
Mode 4 exists in three forms:
• Mode 4A - Insufficient Terrain Clearance, Gear Up. Active during cruise
and approach with the landing gear not in landing configuration. Upper
boundary is at 500-feet RA. If the aircraft penetrates this boundary with
the landing gear still up and at an airspeed less than 190 kts, the voice
warning will be TOO LOW GEAR and the amber GROUND PROX
message will appear on the PFD. Above 190 knots the upper boundary
increases linearly with airspeed to a maximum of 1,000 feet RA altitude at
250 knots or more. Penetrating this boundary produces a repetitive TOO
LOW TERRAIN voice warning.
October 02, 2006
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