737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Controls and Indicators
11.10.12
MN-FLT-OH-201
3
GNSS Landing System (GLS) Light
Illuminated (amber) –
• indicates failure of both GLS sensor units.
• indicates failure of a single GLS sensor unit when either system
annunciator panel is pushed to initiate a recall.
• with single GLS sensor failure, light extinguishes when the system
recall is reset.
Inertial System
IRS Display Unit (ISDU)
1
Display Selector (DSPL SEL)
TEST (spring–loaded to TK/GS) –
• all lights in data displays and on the mode selector unit momentarily
illuminate, followed by a 10 second self–test
• use only during alignment.
TK/GS –
• left window displays true track (course)
• right window displays present ground speed (knots).
R
L
ENT
CLR
2
N
5
H
S
8
0
3
E
6
9
7
4
W
1
SYS DSPL
BRT
TK/GS
TEST
HDG/STS
WIND
PPOS
DSPL SEL
IRS DISPLAY
AFT OVERHEAD PANEL
1
2
3
5
4
6
7
March 1, 2021
