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MK VI MK VIII EGPWS Installation Design Guide
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7.1.1 Discrete Output Words
The discrete output words transmit the status of all MK VI, and VIII EGPWC discrete and audio outputs. Label 274 is
typically used to drive EFIS and/or EICAS displays. The other discrete labels are typically only used for flight recording
and test purposes.
7.1.1.1 EGPWS Alert Discrete #1 (270)
Data: Discrete
Label: 270 Octal
Significant Bits: (see table below)
Sign Bit: N/A
Transmit Interval: 100 msec ± 10%
Bit No. ASSIGNED WARNING MESSAGE (1 = voice on)
11 SINKRATE-PAUSE-SINKRATE
12 PULL UP
13 TERRAIN OR TERRAIN-TERRAIN
14 DONT SINK-PAUSE-DONT SINK
15 TOO LOW GEAR
16 TOO LOW FLAPS
17 TOO LOW TERRAIN
18 GLIDESLOPE
19 MINIMUMS MINIMUMS
* 20 TERRAIN PULLUP
21 CAUTION TERRAIN
* 22 TERRAIN AHEAD PULL UP or OBSTACLE AHEAD PULL UP
* 23 (SIREN) WINDSHEAR WINDSHEAR WINDSHEAR
* 24 CAUTION WINDSHEAR
* 25 ENGINE FAIL
* 26 VEE ONE
* 27 CAUTION TERRAIN or TERRAIN AHEAD
28 CAUTION OBSTACLE or OBSTACLE AHEAD
29 OBSTACLE OBSTACLE
NOTE (*): Bits 23 through 26 will be set to zero when unsupported. Bit 22, This bit is used for the alternate terrain and obstacle warning voice
message. The basic terrain warning message is mapped to bits 13 and 12 and obstacle warning voice mapped to bits 29 and 12. Bits 23 & 24, are
supported by MKVIII EGPWS only, provided that WS is included in configuration. Bits 20, 25 & 26, are Not supported. Bit 27, is the alternate Terrain
Caution voice.
7.1.1.2 EGPWC Logic Discretes (271)
Data: Discrete
Label: 271 Octal
Significant Bits: (see table below)
Sign Bit: N/A
Transmit Interval: 100 msec ± 10%
BIT No. DEFINITION
* 11 GPW INHIBIT (by Windshear)
* 12 WS ALERT INHIBIT
13 TERRAIN CLEARANCE FLOOR ALERT
14 ENVELOPE MOD IN PROGRESS
15 ENVELOPE MOD SNAPSHOT LATCH SET
* 16 WINDSHEAR TAKE-OFF
* 17 WINDSHEAR MASTER VALID
18 TAKE-OFF MODE
19 MODE 1 SINKRATE
20 MODE 1 PULL UP
21 MODE 2 TERRAIN
22 MODE 2 PULL UP
23 MODE 3 VISUAL
24 MODE 4 VISUAL
25 MODE 5 VISUAL
* 26 MODE 7 VISUAL ALERT
27 TERRAIN AWARENESS CAUTION
28 TERRAIN AWARENESS WARNING
* 29 MODE 7 VISUAL WARNING
NOTE (*): Bits 11, 12, 16, 17, 26 and 29 will be set to zero when Not Supported. Supported by MKVIII EGPWS only, provided that WS is included in
configuration.