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.
D6-27370-866-EGP 11.10.17
YW273, YW274
1 ALIGN Light
Illuminated (white) –
• steady – the related IRS is operating in the ALIGN mode, the initial
ATT mode, or the shutdown cycle
• flashing – alignment cannot be completed due to IRS detection of:
• significant difference between previous and entered positions or an
unreasonable present position entry
• no present position entry.
Extinguished –
• IRS not in ALIGN mode
• with mode selector in NAV, alignment is complete, and all IRS
information is available
• with mode selector in ATT, attitude information is available. Heading
information is available following entry of initial magnetic heading.
2 FAULT Light
Illuminated (amber) – a system fault affecting the related IRS ATT and/or NAV
modes has been detected.
IRSLR
ALIGN
DC FAILFAULT
ALIGN
FAULT
OFF
NAV
ALIGN
DC FAIL
ATT
OFF
NAV
ALIGN
ATT
ON DC
ON DC
GPS ILS GLS
INOP INOP
September 15, 2016
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