Flight Management, Navigation -FMC Preflight 737 Operations Manual
Menu Page
The menu page is selected with the MENU key or is automatically displayed when the currently active subsystem fails or on initial power up if the FMC system is not detected.
The menu page displays subsystems (ACARS, DFDAU, etc.) that require control/display functions through the MCDU and provides a means to temporarily access to these subsystems. The active system is indicated by <ACT> displayed next to the system title. A subsystem that requires use of the CDU displays a request message <REQ> next to the subsystem title. The FMC system or a requesting subsystem is accessed by using the line select key next to the title. The FMC can be reselected by selecting the FMC prompt on the MENU page or selecting any mode key (INIT/REF, RTE, etc.). A subsystem can be temporarily placed on hold <HLD> by selecting the subsystem XXXXXX HOLD> line select key returning the CDU display to the currently active FMC page (XXXXXX represents the system name). While the subsystem is on hold the MCDU CALL light is illuminated. To reselect the subsystem on hold, push the subsystem line select key again. When a subsystem is placed on hold a XXXXXX LOGOFF prompt appears to allow for release of the subsystem being held. No more than one subsystem can be selected at a time. If an attempt is made to select more than one subsystem, a FIRST LOGOFF XXXXXX prompt is displayed as a reminder to logoff the currently active subsystem.
Flight Management, Navigation -FMC Preflight 737 Operations Manual
FMC
Push – selects FMC as the system for which the MCDU will be active in providing control/display function.
Other Aircraft Subsystems (typical)
Push – selects the subsystem for which the MCDU will be active in providing control/display function.
XXXXXX HOLD/LOGOFF
Push - places active subsystem on hold or logs off subsystem and returns control to the FMC.
Copyright . The Boeing Company. See title page for details.
11.40.46 December 1, 2000
737 Operations Manual
Introduction
The FMC takeoff phase begins with the selection of takeoff/go–around (TO/GA). Preparation for this phase begins in the preflight phase and includes entry of the TAKEOFF REF page data.
The takeoff phase automatically changes to the climb phase when climb thrust is selected. The climb phase continues to the top of climb point, where the cruise phase begins.
During these phases, the following pages are normally used:
.
TAKEOFF REF page – to make last minute changes to the departure
runway
.
DEPARTURES page – to make last minute changes to the SID
.
CLB page – to modify climb parameters and monitor airplane climb
performance
.
RTE LEGS page – to modify the route and monitor route progress
.
PROGRESS page – to monitor the overall progress of the flight
.
N1 LIMIT page – to select alternate climb thrust limits
.
DEP/ARR INDEX page – to select an approach during a turn–back.
Takeoff Phase
When last minute changes are made to the departure runway and SID, the TAKEOFF REF and DEPARTURES pages must be modified to agree. The modifications are performed the same as during preflight.
With correct takeoff parameters, the FMC commands the selected takeoff thrust when the TO/GA switch is pushed. During the takeoff roll, the autothrottle commands the thrust and the FMC commands acceleration to between V2+15 and V2+25 knots.
LNAV can be engaged at 400 feet and provides roll commands to fly the route leg. VNAV may be engaged after flap retraction to control the climb profile.
Climb Phase
VNAV commands acceleration to:
.
250 knots
.
waypoint speed constraints, or
.
the speed restriction associated with the origin airport, whichever is more restrictive.
Flight Management, Navigation -FMC Takeoff and Climb
737 Operations Manual
At the climb thrust reduction point, on airplanes with automatic thrust reduction, the FMC commands a reduction to the selected climb thrust. Passing 10,000 feet, VNAV commands an acceleration to the economy climb speed, which is maintained until entering the cruise phase. Waypoint speed constraints take priority if slower than target speed.
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