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FMC is lost. There is a time delay before the FMC message FMC LEFT, RIGHT
displays. When the FMC selector is rotated to the operative FMC, the FMC is
available through the CDU. Once an FMC page is accessed, the scratchpad
message SINGLE FMC OPERATION displays on the CDU with the operative
FMC.
Dual FMC Failure
If both FMCs fail, LNAV and VNAV fail. The CDUs supply route data to their
related ND. Alternate navigation using CDUs is discussed in Section 50 of this
chapter. Autothrottle operation is not available.
Note: If the MENU page displays and the <FMC prompt is not displayed in line
1, pushing the LEGS function key displays the ALTN NAV LEGS page,
the PROG key displays the ALTN NAV PROGRESS page, and theNAV
RAD key displays the ALTN NAV RADIO page.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.32.6 D6-30151-425
Flight Management, Navigation -
Flight Management Computer
Intentionally
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April 1, 2000
747 Operations Manual
Flight Management, Navigation Chapter 11
FMC Preflight Section 40
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.40.1
Introduction
Completion of the FMC preflight requires data entry in all minimum required data
locations. Entry of all required and optional preflight data optimizes FMC
accuracy.
Data link can load preflight data from airline ground stations. Using data link
reduces the number of required flight crew actions. Manual flight crew entries
replace existing data. Data link can also load takeoff data onto the TAKEOFF REF
pages.
FMS-CDU Operation
Work in a slow, deliberate manner while operating the CDU. Avoid pushing more
than one key at a time. Avoid entering information in both CDUs at the same time.
Do not push keys when the system is resynchronizing. Resynchronizations
complete in approximately 15 seconds. During this time, the respective CDU
displays a failed condition, while the other CDU displays the message
RESYNCHING OTHER FMC.
Uncareted, small font, or default values are not required to be line-selected to be
valid. For example, acceleration heights and the thrust reduction point on the
Takeoff Ref page are valid in small font.
Preflight Page Sequence
The usual FMC power–up page is the identification page. Preflight flow continues
in this sequence:
• identification (IDENT) page
• position initialization (POS INIT) page
• route (RTE) page
• DEPARTURES page (no prompt)
• navigation radios (NAV RAD) page (no prompt)
• performance initialization (PERF INIT) page
• thrust limit (THRUST LIM) page
• takeoff reference (TAKEOFF REF) page
Some of these pages are also used in flight.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.40.2 D6-30151-425
Flight Management, Navigation -
FMC Preflight
Minimum Preflight Sequence
During preflight, a prompt in the lower right directs the flight crew through the
minimum requirements for preflight completion. Selecting the prompt key
displays the next page in the flow. If a required entry is missed, a prompt on
TAKEOFF page leads the flight crew to the preflight page missing data.
Airplane inertial position is required for FMC preflight and flight instrument
operation.
A route must be entered and activated. The minimum route data is origin and
destination airports, and a route leg.
Performance data requires entry of airplane weights, fuel reserves, cost index, and
cruise altitude.
PREFLIGHT COMPLETE
RAD
NAV
INIT
REF
INIT
REF
NAV RADIO
THRUST LIM>
PERF INIT
TAKEOFF>
THRUST LIMIT TAKEOFF REF
THRUST LIM>
POS INIT
ROUTE>
EXEC
ACTIVATE>
IDENT
ACT RTE 1
PERF INIT>
POS INIT>
RTE 1
DEP
ARR
DEPARTURES
ROUTE>
REQUIRED
S_I_D_ _E_N_T_R_Y_
________
EXEC KEY ILLUMINATES
XXX XXXX
IDENT PAGE
NOT DISPLAYED
__________
_____________
<INDEX
<IDENT
INIT/REF INDEX
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Preflight
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.40.3
Takeoff data requires a flap setting and center of gravity.
Supplementary Pages
Supplementary pages are sometimes required. These pages have no prompts and
interrupt the usual sequence. Discussion of each page includes a method to display
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