EGPWS LINE MAINTENANCE MANUAL
2.1.1 ENHANCED GROUND PROXIMITY WARNING COMPUTER (EGPWC)
All EGPWS functions are processed by a single Line Replaceable Unit (LRU) called the Enhanced Ground Proximity Warning Computer (EGPWC).
The MK V and MK VII EGPWC are digitally controlled computers housed in a 2 MCU ARINC
The MK VI and MK VIII EGPWC are digitally controlled computers housed in a
The MK XXII EGPWC is a digitally controlled computer housed in a
The EGPWC receives information in AC, DC, discrete, and synchro analog formats, and
2.2 OPERATION
2.2.1 MODE 1 – EXCESSIVE DESCENT RATE
Mode 1 provides audio and visual alerts for excessive descent rates into terrain. When the EGPWS caution alert envelope is penetrated, the message “SINKRATE” is enunciated and EGPWS alert lights illuminate. Continuing the excessive descent rate into the EGPWS warning alert envelope results in a
2.2.2 MODE 2A/2B - TERRAIN CLOSURE RATE
Mode 2 provides audio and visual alerts for dangerously high terrain closure rates. Two
2.2.3 MODE 3 - DESCENT AFTER TAKEOFF
Mode 3 provides audio and visual alerts for excessive altitude loss after takeoff, or after a
2.2.4 MODE 4A/4B/4C - UNSAFE TERRAIN CLEARANCE
Mode 4 provides audio and visual alerts for unsafe terrain clearance with respect to phase of flight, height above ground, and speed. Three
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