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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 takeoff,
the pilot can select TO if required.
− Flex thrust does not result in any loss of function, failure warnings or takeoff
configuration warnings.
− 75% of full rated thrust is used on all takeoffs.
· 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
takeoff
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.
POWER PLANT
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
18−10−18
ENGINE INDICATIONS (CONT'D)
FMS Selection (EPR)
To select EPR ratings on the FMS proceed as follows:
GF1810_028
1 Select PERF function key a.nd go to page 2/2 of the PERF INDEX.
2 Select THRUST MGT line s.elect key.
3 Select applicable OR line select key on RATING line and set as required.
4 To select SYNC mode, select OR line select key on SYNC line and set as required.
FPL
KICT 998/02 + 47
ORIGIN DIST/ETE GS
MEM 01 + 06
104° 392NM
VUZ 00 + 29
115° 174NM
PATTERN FPL SEL
K I CT − K O R L
@ 359
PERF INDEX 2/2
INIT<− − WHAT − − IF − − > DATA
INIT <− STORED FPL − − >DATA
THRUST MGT
PERF INDEX 2/2
INIT< − − WHAT − − IF− − > DATA
INIT < − STORED FPL − > DATA
THRUST MGT
THRUST MGT 1/1
OR
OR
AUTO 1.65 (TO)
N1
RATING
SYNC
FUEL MGT S . E. RANGE
THRUST MGT 1/1
OR
OR
AUTO 1.65 (TO)
EPR
RATING
SYNC
RATING MODE 1/1
AUTO 1.60 (TO) RETURN
TO 1.65 1.58 MCT
CLB 1.60 1.55 CRZ
− . −− EPR < − − − MAN − − − > N1 − − −
THRUST MGT 1/1
OR
OR
AUTO ( 1.60 )
EPR
RATING
SYNC
SYNC MODE 1/1
N 1 RETURN
N2 OFF
EPR (ACT)
1/3
FUEL MGT S. E. RANGE
POWER PLANT
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
18−10−19
ENGINE INDICATIONS (CONT'D)
N1 (Fan)
The N1 LP compressor (fan) speed is used as the alternate engine control. The N1 signals are
used by the EEC for engine control functions and are used by the Engine Vibration Monitor Unit
(EVMU).
N1 is measured by four speed probes per engine, mounted on the front bearing housing.
Three speed probes are used by the EEC for the following:
· N1 EICAS indication.
· N1 redline limiting.
· N1 Rating control
· Thrust control (reverse thrust).
· Independent Overspeed Protection (IOP) at 111.0 % N1 speed.
The fourth probe is used by the EVM system for engine vibration indication.
GF1810_029
AIRFRAME
ENGINE
73.3 73.3
N1
N1
SPEED
PROBE
N1
SPEED
PROBE
N1
SPEED
PROBE
N1
SPEED
PROBE
ENGINE
VIBRATION
MONITOR
UNIT
EEC
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