737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Controls and Indicators
11.10.14
MN-FLT-OH-201
6
Keyboard
Push –
• alpha keys:
•data displays are controlled by the keyboard when the N, S, E, W
(latitude/longitude) or H (heading) keys are pushed
•pushing an alpha key arms the keyboard for numeric entries.
• numeric keys:
•permit manual entry of present position when ALIGN light is
illuminated
•permit manual entry of magnetic heading when either mode selector is
in ATT.
7
Clear (CLR) Key
Illuminated (white) – an ENT attempt has failed (entry not accepted by IRS).
Push – clears data display of any data not yet entered or accepted. If illuminated,
cue lights extinguish.
IRS Mode Selector Unit
1B785, 1B786, 1J585 - 1J594
IRS
L
R
ALIGN
DC FAIL
FAULT
ALIGN
FAULT
OFF
NAV
ALIGN
DC FAIL
ATT
OFF
NAV
ALIGN
ATT
ON DC
ON DC
GPS
ILS
GLS
AFT OVERHEAD PANEL
1
2
3
4
5
March 1, 2021