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AIRFRAME SIGNALS AIRFRAME SIGNALS
ENGINE ENGINE
OUTPUTS INPUTS INPUTS OUTPUTS
INPUTS INPUTS
ENGINE PARAMETER FEEDBACK TO BOTH CHANNELS OF THE EEC (AS ABOVE) AND DIRECT TO AIRFRAME SYSTEMS, IE: VIBRATION.
GF1810_022
The IOP will automatically shut off fuel in the event of N1 or N2 reaching the overspeed trigger values. When either N1 or N2 speed signal has exceeded a preset value, one of the IOPs will “vote” to close the HPSOV, located in the FMU and indicate this to the other channel via the cross link. The engine will not shut down unless both IOPs detect an overspeed. The overspeed function is checked during normal engine shut down, by resetting the overspeed trip points to a sub-idle value. When the speed drops below the reset values, the IOP overspeed detection trip points logic resets.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
POWER PLANT
ENGINE INDICATIONS
Primary engine parameters are displayed on EICAS. Secondary engine parameters are displayed on the STAT page.
measured in U.S. quarts.
FGF1810_007
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
POWER PLANT
Engine Pressure Ratio (EPR)
EPR is the primary control mode for thrust setting.
Raw EPR is calculated as a ratio of engine inlet total pressure and engine exhaust total pressure (P20 and P50) and then trims are applied to generate a fully trimmed EPR for engine control and display.
The engine inlet total pressure and temperature are sampled at the fan inlet. Engine inlet total pressure (P20/T20) is used by the EEC. P20 is used by the EEC for control functions and in the calculation of EPR and Mach number. Temperature sensor (T20 )is used by the EEC for control function and for various EPR related functions.
The core engine exhaust total pressure (P50), in combination with P20/T20, is also used by the EEC for EPR calculation. P50 air is sensed by four pressure probes, located on the outlet guide vane assembly. The pressure transducer within the EEC provides a signal to both channels of the EEC and is temperature compensated. The data entry plug ensures that both engines display the same EPR for the same actual engine thrust level.
P20 P50
Volume 2
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
POWER PLANT
EPR Control
EPR control mode is selected on the engine control panel, located on the pedestal. Both EPR or
N1 switches should be the same selection.
Engine Switches
Used to select engine control mode:
N1 . selects engine control in alternate mode.
EPR . selects engine control in primary mode.
EPR Indication
GF1810_027
GF1810_026
Displays thrust rating which are selected selected by the FMS.automatically or manually. The following If autothrottle is engaged SYNCrating modes are available: will appear under N1 and N2
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