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whichever is controlling.
NOTE
All indications will be magenta except when MAN or FLEX is selected, in which case the indications will be cyan.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
POWER PLANT
EPR Rating Mode Selection
EPR rating mode is automatically or manually set through the FMS PERF pages on the FMS.
The following modes are available:
. TAKE-OFF (TO) Rating . This rating is always set whenever the airplane is on the ground and the thrust is advanced towards take-off. Operation at TO rating is limited to a maximum of 5 minutes. The TO rating will remain until all of the following conditions are met:
. The airplane is ≥ 400 feet above the runway.
. The flaps/slats are retracted.
. The pilot retards the thrust lever (Throttle Lever Angle (TLA) < 37°). This condition does
not apply when autothrottle is engaged. . If AFCS mode is go-around or windshear, the rating is automatically set to TO . If in descent and the flaps/slats or landing gear are extended, the rating will transition
from cruise (CRZ) to TO.
. Reduced Thrust Take-off (FLX) Rating . The FLX mode is permissible when airplane weight and runway conditions are such that full TO rating is not required. FLX thrust is implemented by the use of an assumed temperature higher than ambient day temperature and is subject to the following:
. The use of FLX thrust is at the pilot’s discretion.
. When carrying out a FLEX take-off, the pilot can select TO if required.
. Flex thrust does not result in any loss of function, failure warnings or take-off
configuration warnings.
. 75% of full rated thrust is used on all take-offs.
.
Climb (CLB) Rating . After transition from TO or FLX to climb, the engine rating will stay in CLB until reaching the cruise altitude. After reaching initial cruise altitude, the rating will go back to CLB if a new climb is performed (step climb).
.
Cruise (CRZ) Rating . The rating will transition from CLB to CRZ after reaching within 200 ft of the Top Of Climb (TOC) altitude and the throttles have been retarded to an angle corresponding to maximum CRZ thrust. The rating will remain in CRZ as the airplane descends, until flaps/slats or gear are selected down, at which point the rating will return to TO.
.
Maximum Continuous Thrust (MCT) . This rating is valid when an engine is failed, the rating mode will transition out of TO and into MCT. The rating will remain at MCT in the engine out condition, as long as the twin engine rating would have been CLB or CRZ.
.
Manual Engine Rating (MAN) . Any rating but FLX can be selected on the FMS RATING Select page. This freezes the rating type.
SYNC Mode Selection
The engine synchronization (SYNC) function is selected automatically by the autothrottle system (if engaged), or manually via the FMS. SYNC system will compare engine speeds and compute a trim value to match the two engine speeds. SYNC mode may be manually selected by the crew for take-off below 400 feet, but is inhibited in the automatic mode below 400 feet. N1 shaft speed, N2 shaft speed or EPR mode can be synchronized.
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