737 MAX Flight Crew Operations Manual
Warning Systems -
Controls and Indicators
MN-FLT-OH-201
15.10.9
1B785, 1B786, 1B814 - 1J594
1
BELOW Glideslope (G/S) light
The BELOW G/S light illuminates when the GPWS senses excessive deviation
below the ILS or GLS glideslope or the FMC generated flight path angle.
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, DPC, or EFIS control
panel.
Note:
In the event of a DPC failure, the GND PROX 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
GND PROX
INOP
NORM
NORM
NORM
GEAR
INHIBIT
GROUND PROXIMITY
BELOW G/S
P-INHIBIT
MAIN PANEL -
CAPTAIN/FIRST OFFICER
1
2
3
7
5
MAIN PANEL - FIRST OFFICER
4
8
6
March 1, 2021
