737 Flight Crew Operations Manual
Flight Management, Navigation -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
11.10.16 D6-27370-866-EGP
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
YK981 - YQ456
IRSLR
ALIGN
DC FAILFAULT
ALIGN
FAULT
OFF
NAVALIGN
DC FAIL
ATT
OFF
NAVALIGN
ATT
ON DC
ON DC
GPS
September 15, 2016
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