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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 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
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 101.0 % 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
CHANNEL
A
EEC
CHANNEL
B
IOP
CHANNEL
A
IOP
CHANNEL
B
POWER PLANT
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
18−10−20
ENGINE INDICATIONS (CONT'D)
N1 Control
N1 control mode is selected on the engine control panel, located on the pedestal. Both switches
must be in the same position. N1 can also be selected automatically by the EEC in the event of an
EPR control mode failure. This is known as a soft reversion and both switches should then be
selected to N1, hard reversion, until the EPR failure is cleared. An amber EICAS message will be
displayed when a failure is detected and a status message will be displayed, when the control
switches have been selected to N1 control.
GF1810_030
NOTE
Before manually reverting to N1 control, the thrust levers should be retarded to avoid thrust "bumps".
Hard Reversion
L−R FADEC N1 CTL
L−R FADEC N1 CTL
N1 Indication
GF1810_031
NOTE
When the N1 readout and the N1 rating match, the bugs will blend.
SYNC Mode
Displays synchronized mode as
selected by the autothrottle or
manually through the FMS.
N1 Rating Readout
Displays the N1
numerical target.
N1 Rating "V" Bug
Displays the target N1
bug for MAN mode.
N1 Readout
N1 value.
N1 "T" Readout Bug
Displays the current
N1 command bug.
73.3 73.3
N1
MAN
SYNC
85.4 85.4
N1 Speed Redline
Displays the maximum N1
speed allowed and is set at
101.0%. Should the N1 limits be
exceeded, the sweep arm and
N1 readout will be red.
Engine Control Mode Box
Displays when in N1 control
mode.
N1 Rating Mode
Displays mode as selected
manually via the FMS
THRUST MGT page.
101.4
N1 Sweep Arm
Displays the current
N1 value.
Displays the current
POWER PLANT
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
18−10−21
ENGINE INDICATIONS (CONT'D)
Inter Turbine Temperature (ITT)
ITT measures engine operating temperatures and is used by the EEC during engine start and
relight.
Seven dual element (dissimilar metals) thermocouples located in the LP turbine entry area are
connected in parallel and provide an average ITT to each lane of the EEC.
A data entry plug ensures that all engines have the same ITT redline. The redline will change
value depending on the start configuration, ground or inflight.
GF1810_032
AIRFRAME
ENGINE
CHANNEL CHANNEL
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