737 Operations Manual
Non-Normal Checklists -
Flight Management, Navigation
Copyright © The Boeing Company. See title page for details.
NNC.11.2 D6-27370-400E-TBCE
FMC FAIL - DUAL FMC AIRPLANES
Condition: Illumination of the FMC alert light accompanied by:
• loss of FMC information on both CDU’s and loss of FMC data on the
captains’s navigation display map mode indicates left FMC failure
• 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:
LNAV and VNAV are not available. Resume conventional
navigation. AN/CDU LNAV operation is available (as
installed.)
Note: When preparing for approach, use manual N1 set
knobs to set the N1 bugs.
INSTRUMENT SWITCH
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.
December 06, 2002
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