737 Operations Manual
Non-Normal Checklists -
Flight Management, Navigation
Copyright © The Boeing Company. See title page for details.
NNC.11.4 D6-27370-400E-TBCE
IRS FAULT
Condition: An IRS FAULT light illuminated indicates the related
IRS system has detected a fault. On the ground, the
IRS FAULT light accompanied by an ALIGN light may
indicate the entered present position is incorrect.
On the ground:
If the ALIGN light is illuminated:
IRS MODE SELECTOR . . . . . . . . . . . . . . . . . . . . . . . . OFF
[The FAULT light extinguishes immediately and the ALIGN light
extinguishes after approximately 30 seconds.]
After the ALIGN light extinguishes:
IRS MODE SELECTOR. . . . . . . . . . . . . . . . . . . . . .NAV
PRESENT POSITION . . . . . . . . . . . . . . . . . . . . ENTER
If the ALIGN light illuminates again, re-enter present
position.
If the FAULT light illuminates again, notify
maintenance.
In flight:
Note: The IRS ATT and/or NAV mode(s) may be
inoperative.
IRS MODE SELECTOR (affected IRS) . . . . . . . . . . . . . . ATT
Maintain straight and level, constant airspeed flight
until attitude displays recover (approximately 30
seconds.)
If the FAULT light extinguishes:
MAGNETIC HEADING . . . . . . . . . . . . . . . . . . . . . . ENTER
Enter updated heading periodically on the POS INIT
page or on the overhead IRS display unit by
selecting HDG/STS.
Do not use autopilot approach mode.
Continued on next page
June 07, 2002
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