737 Flight Crew Operations Manual
Warning Systems -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
15.10.8 D6-27370-866-EGP
YK995 - YQ456
1 BELOW Glideslope (G/S) light
Illuminated (amber) – below glideslope alert is active.
Push – inhibits ground proximity GLIDESLOPE alert when below 1,000 feet
radio altitude.
2 Inoperative (INOP) light
Illuminated (amber) – GPWS computer malfunction or power loss
• invalid inputs are being received from radio altimeter, ADIRU, ILS
receiver, IRS, FMC, stall management computers, or EFIS control
panel.
YW273, YW274
Note: In the event of a DEU failure, the GPWS INOP light will illuminate, and
the EBAW/ROLL AUTHORITY aural alert will not function; however,
the visual alert, if triggered, will be valid if displayed on the PFD.
FLAP
INHIBIT
TERR
INHIBIT
RUNWAY
INHIBIT
NORM
INOP
RUNWAY
SYS TEST
GRD PROX
INOP
NORM NORM NORM
GEAR
INHIBIT
GROUND PROXIMITY
LEFT AND RIGHT
FORWARD PANELS
1
2
3
7
5
RIGHT FORWARD PANEL
4
8
6
September 15, 2016
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