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The FADEC will always program the best idle speed for any phase of flight. When the aircraft transitions from one flight phase to the next, idle rpm is automatically adjusted. There are three different N2 idle settings: flight idle, reverse idle, and ground idle.
FLIGHT IDLE
Flight idle refers to the idle setting used when the thrust lever is set to idle while airborne (weight-off-wheels).
May 06/2005 Flight Crew Operating Manual Volume 2 REV 2 CSP 100-6
18-01-05 ENGINE CONTROL SYSTEM (Cont)
GROUND IDLE
N2 ground idle is the minimum thrust setting. It is selected when weight is on wheels and the thrust lever is idle. Ground idle varies with altitude and temperature. Increases in altitude or ambient temperature result in an increase in N2 idle rpm. Decreases in altitude or ambient temperature result in a decrease in N2 idle rpm.
REVERSE IDLE
When reverse idle is selected, reverse balk is activated by the FADEC. Further movement rearward beyond the REV detent is restricted until the thrust reverser is fully deployed.
SINGLE ENGINE THRUST MANAGEMENT
The FADEC computers continuously crosstalk to share data on the health of each engine. The FADEC will automatically activate the APR function on the operating engine, should the other engine fail, as long as the TLA is in the TO detent or above and the APR has not been disabled by the crew.
The FADEC system monitors N2 rpm of both engines. If the mismatch of N2 speed exceeds 15%, the FADEC automatically increases the N1 speed of the operable engine.
AUTOMATIC POWER RESERVE
When an engine fails, the automatic power reserve (APR) feature of the FADEC will automatically increase the thrust for the operating engine to the emergency thrust power setting of APR power.
Automatic Power Reserve is available when APR is armed during takeoff if the thrust levers are in the TO detent or above and if APR has not been disabled by the crew. On the approach, APR is armed for the go-around when in approach config-uration (either engine is available, flaps greater than 20° , or the landing gear is down).
APR power for both engines can also be selected by advancing both thrust levers to the APR stop. A cyan APR icon appears to the right of each N1 indicator.
ENGINE CONDITION AND FAULT REPORTING (ECFR)
An engine condition and fault reporting system is installed to provide monitoring of engine health. The system periodically records engine parameters and allows the crew to request that conditions be recorded at anytime. Use of the system entails downloading data from the FADEC for review by maintenance personnel. The data may be downloaded at anytime to assist in diagnosing engine problems which may be encountered. The ECFR is intended for maintenance functions and in-flight monitoring or diagnosis by maintenance personnel. The system is integrated into the FADEC of each engine.
ECFR EVENT SWITCH
The EVENT switch is located on the engine control panel. The switch allows the flight crew to manually initiate data col-lection to the ECFR.
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