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Honda Aircraft Company
HA-420
SYSTEMS
POM
DESCRIPTION
Figure 1-47. GE Honda Aero Engines HF120 Engine General Arrangement
Engine Control System
The engine control system is a dual-channel Full Authority Digital
Engine Control (FADEC) based system. The system controls the engine
response to thrust command inputs from the thrust levers and other
cockpit controls and provides information to the aircraft for cockpit
indication, dispatch status and maintenance reporting.
Power is provided to the FADEC by a dedicated, dual wound Permanent
Magnet Alternator (PMA) which is integral to the Fuel Pump and
Metering Unit (FPMU). During starting and operation near idle, power
is supplied by the aircraft electrical system.
The engine control system incorporates hardware and/or software limits
to prevent overpressure or overspeed of the engine. Limit protections are
provided within the software for fan speed, core speed, fuel flow and HP
compressor discharge pressure. Also, during ground starts only, the
HJ1-29000-005-001
October 30, 2016
1-76
FOR TRAINING PURPOSES ONLY
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