Discrete output words, Egpws alert discrete #1 (270), Egpwc logic discretes (271) – Honeywell MK VI User Manual
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Honeywell
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.