MD-11 Flight Crew Operations Manual
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FMS -
Controls and Displays
FMS.30.73
Takeoff Derates
A pilot has as an option, to choose from two different kinds of derated takeoff
thrust limits, a flex temperature and a fixed-percentage.
Flex Temperature Derates - A FLEX temperature can be entered on the
TAKEOFF page or in 1R on the THRUST LIMITS page. If a FLEX temperature
has been entered, the computed FLX DERATE thrust limit is displayed in 2L. If
either of the Single or Dual Fixed-Percentage Derate(s) option are enabled, then
those takeoff derates are removed from the display when a FLEX temperature has
been entered. The FLX DERATE thrust limit can be deactivated before takeoff by
clearing the FLEX temperature entry in 1R using the CLR key, or by selecting an
available takeoff thrust. During a flexible derate takeoff, full takeoff thrust can be
restored by pushing the TO/GA button on the throttle levers.
Fixed-Percentage Derates - If enabled, one or two fixed percentage derates are
displayed in line 2 (2L and 2R, as applicable). The ARMED or ACTIVE derated
thrust limit is always displayed on the left side of the display, 2L. For example, if
T/O2 in 2R is selected to be the ACTIVE thrust limit , then T/O2 is moved to 2L,
displayed in large font, and T/O1 is displayed in 2R as available to be activated.
Whenever a fixed percentage takeoff derate is selected as the ACTIVE thrust
limit, the associated climb derate is automatically ARMED (CLB1 with T/O1, or
CLB2 with T/O2). The pilot has the option of cross-arming climb and takeoff
derates (CLB2 with T/O1, or CLB1 with T/O2) by simply selecting the desired
AVAILABLE FOR ARMING climb derate at LSK 5R after the derated takeoff
thrust has been selected.
Maximum Continous Thrust
MCT automatically becomes active in the event of low-speed protection or engine
failure. When the low speed condition or engine out condition has been cleared,
the thrust limit automatically transitions from MCT to CLB or CRZ, as
appropriate for the current flight phase.
Climb Derates
If enabled, one or two fixed-percentage climb thrust derates are displayed in line
5 (5L and 5R, as applicable). The climb derate is armed when the associated
fixed-percentage takeoff derate is selected (CLB1 with T/O1 and CLB2 with
T/O2). The pilot has the option of cross-arming climb and takeoff derates (CLB2
with T/O1, or CLB1 with T/O2) by simply selecting the desired derated climb
thrust limit after the derated takeoff thrust limit has been selected.
The climb thrust limit (4L) and climb derates (5L and 5R) operated the same as
the maximum and derated takeoff thrust limits. At the thrust reduction altitude,
the following occurs:
• The FMS transitions to CLIMB thrust limit.
September 03, 2007
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