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• illumination of the FMC message light, loss of FMC data on the first
officer’s navigation display map mode, and a SINGLE FMC
OPERATION scratchpad message indicates right FMC failure
• loss of FMC information on the CDU and loss of FMC data on both
navigation display map modes indicates dual FMC failure.
If only the left or right FMC has failed:
FMC source
select switch . . . . . . . . . . . . . . .BOTH ON L or BOTH ON R
Select operating FMC.
If DUAL FMC OP RESTORED message appears:
FMC source select switch . . . . . . . . . . . . . . . . .NORMAL
If dual FMC failure has occurred:
Resume conventional navigation.
[Without an operating FMC, LNAV and VNAV are not available.
AN/CDU LNAV operation is available (as installed).]
When preparing for approach:
Use the manual N1 set knobs to set the N1 bugs.
Condition: The INSTR SWITCH light illuminated indicates either
the electronic flight instrument or IRS transfer switch
has been moved from the NORMAL position.
No crew action required in flight.
FMC FAIL - DUAL FMC AIRPLANES
INSTRUMENT SWITCH
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 11.3
11.3
Condition: An IRS DC FAIL light illuminated indicates the related
IRS DC power has failed.
If all other IRS lights are extinguished, operate normally.
Note: With both IRS DC FAIL lights illuminated, the
switched hot battery bus is not powered or the
battery is nearly discharged.
IRS DC FAIL
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.

11.4
11.4
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.
Continued on next page
IRS FAULT
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 11.5
11.5
Continued from previous page
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.
If the FAULT light remains illuminated:
IRS TRANSFER
SWITCH . . . . . . . . . . . . . . . . .BOTH ON L or BOTH ON R
Note: Do not engage either autopilot.
Condition: An IRS ON DC light illuminated indicates the related
IRS is operating from the switched hot battery bus.
Power to the right IRS is removed after 5 minutes.
IRS ON DC
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.

11.6
11.6
Condition: UNABLE REQD NAV PERF-RNP is displayed in MAP
or Center MAP.
If flying an approach that has an RNP alerting requirement:
Initiate a go-around unless suitable visual references can
be established and maintained.
If flying an approach without an RNP alerting requirement:
Verify position.
UNABLE REQD NAV PERF - RNP
June 3, 2005
737 Flight Crew Operations Manual
Non-Normal Checklists Chapter NNC
Fuel Section 12
Copyright © The Boeing Company. See title page for details.
 TOC.12.1
Table of Contents
NNCC.R12O NSonS-NFoErmEaDl C SheEckLliEstsC-FTuOel R INOPERATIVE . . . . . . . . . . . . . . . . . 12.1
ENGINE FUEL LEAK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.2
FUEL FILTER BYPASS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.5
FUEL PUMP LOW PRESSURE . . . . . . . . . . . . . . . . . . . . . . . . . . 12.6
　
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