737 Flight Crew Operations Manual
Engines, APU -
Engine System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
7.20.6 D6-27370-866-EGP
Idle Operation
The EEC automatically selects ground minimum idle, flight minimum idle, and
approach idle. Ground minimum idle is selected for ground operations and flight
minimum idle is selected for most phases of flight. Approach idle is selected in
flight if flaps are in landing configuration or engine anti–ice is ON for either
engine. At the same airspeed and altitude, N1 and N2% RPM will be higher for
approach idle than for flight minimum idle. This higher% RPM improves engine
acceleration time in the event of a go–around. Approach idle is maintained until
after touchdown, when ground minimum idle is selected. In flight, if a fault
prevents the EEC from receiving flap or anti–ice signals, approach idle schedule
begins below 15,000 feet MSL.
September 26, 2013
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