MD-11 Flight Crew Operations Manual
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FMS -
Controls and Displays
FMS.30.35
Active DES Page
The DES page is the active PERF page when the aircraft is in descent or approach
(including driftdown).
The FMS speed modes are as follows:
• ECON - Most economical Mach/CAS for time and fuel trade-off, based
on the cost index entry (not editable).
• POLICY - Same as ECON mode, except with a flight crew-selected CAS
(intended to suit airline descent policy).
• MAX DES - CAS which provides the maximum rate of descent (not
editable).
• EDIT - Flight crew-selected Mach and/or CAS. A Mach entry without a
specified CAS causes VMO to be the associated CAS. A CAS entry
without a specified Mach causes MMO to be the associated Mach. Prior
to any selection, brackets are displayed.
ECON mode is available for activation except as follows: If POLICY mode was
previously enabled in preflight with the DES PRESELECT page, then POLICY
mode is available (instead of ECON) for activation. If POLICY mode is removed
(with the CLR key and 2L), then ECON becomes available again.
The speed mode that is preselected on the PRESELECT DES page is
automatically activated when the DES page becomes the active PERF page.
Thereafter, the flight crew may activate any available speed mode by selecting the
LSK adjacent to the speed displayed on that mode.
The DES page provides time and distance predictions for achieving the selected
(PRED TO) altitude of line 1R. If a flight crew entry is made in the PRED TO
field, it is displayed there in large font. Otherwise, the FCP altitude is displayed in
small font.
The time and distance predictions are displayed in large font for the active speed
mode. If ECON or EDIT speed mode is active, time and distance predictions for
MAX DES mode are also displayed, but in small font.
1L
2L
3L
4L
5L
6L
1R
2R
3R
4R
5R
6R
LB1-3-0081
October 02, 2006
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