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Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
POWER PLANT
ENGINE INDICATIONS (CONT'D)
FMS Selection (EPR)
To select EPR ratings on the FMS proceed as follows:
Select PERF function key and go to page 2/2 of the PERF INDEX.
.
Select applicable OR line select key on RATING line and set as required.
To select SYNC mode, select OR line select key on SYNC line and set as required.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
POWER PLANT
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
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
POWER PLANT
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.
Before manually reverting to N1 control, the thrust levers should be retarded to avoid thrust "bumps".
N1 Indication
N1 Rating Readout N1 Sweep Arm N1 Speed Redline
Displays the N1 Displays the current Displays the maximum N1
Displays synchronized mode as N1 Rating Mode
selected by the autothrottle or Displays mode as selected
manually through the FMS. manually via the FMS
THRUST MGT page.
NOTE
When the N1 readout and the N1 rating match, the bugs will blend.
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Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
POWER PLANT
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.
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