MD-11 Flight Crew Operations Manual
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FMS -
Description and Operation
FMS.10.2
• Review of aircraft configuration and FMC database effective dates.
• Entry/selection or origin destination, cruise altitudes, flight no., and cost
index.
• Entry of weight and fuel data.
• IRS alignment.
• Flight plan, runway SID and transition entry and waypoint revision to
include speed, altitude, and time constraints.
• Entry of takeoff Vspeeds.
• Selection of economy or pilot selected flight phase speed.
• Confirming auto tuning of navigation radios for departure.
The TAKEOFF phase extends up to the acceleration altitude. NAV mode may be
armed on the ground once all engines are started. NAV will be engaged at 100 feet
in FD mode. AP/NAV cannot be coupled until 400 feet. Thrust reduction will be
automatic at the thrust reduction altitude only if FMS PROF is engaged.
PROF can be armed on the ground. If armed, PROF will engage automatically at
400 feet RA.
The CLIMB phase extends from the acceleration altitude to the top of climb (T/C)
for the first cruise flight level entered on the F-PLN INIT page.
The SPD/PROF climb mode will provide guidance for accelerating the aircraft
when above the terminal area speed restriction altitude. The mode will observe
speed/altitude constraints that have been stored in the FMC database or inserted
by the pilot. The FMC will provide speed and altitude targets to the AFS during
climb if FMS SPD and PROF are pushed.
The CRUISE phase extends from the T/C point to the Top of Descent (T/D).
Cruise could include step climbs as well as enroute descents. The FMC will
calculate the optimum step climb point. A step climb requires setting a new
altitude target on the FCP with the altitude changes being initiated automatically.
Enroute descents are initiated by level change or vertical speed mode, and then
reinserting a new CRZ FL into the MCDU.
The DESCENT and APPROACH phases start from the T/D or by the pilot
initiating a descent via V/S or level change mode. The FMC will calculate the
appropriate point for the start of descent and will initiate the descent automatically
if the FCP altitude has been lowered and the aircraft is in PROF and SPD mode.
NAV and PROF guidance during an approach are terminated when the ILS
localizer and glideslope are intercepted. If a missed approach becomes necessary,
NAV and PROF modes may again be engaged in order to automatically fly the
Missed Approach Procedure (MAP). After landing and engine shutdown, the
FMC goes through a flight-complete phase, clearing the active flight plan in
preparation for re initializing. In addition, some of the data entry fields reinstalled
to default data.
October 02, 2006
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