Honda HondaJet HA-420 Pilots Operating Manual page 96

Honda Aircraft Company
HA-420 SYSTEMS
POM DESCRIPTION
N Synchronization
1
The N synchronization function is used to set the N command of the
1 1
right (slave) engine to be the same as the left (master) engine. The
FADEC will automatically engage synchronization when all the required
parameters are met. The pilot can manually disable synchronization by
use of the CDU Engine control page.
Engine Limits Protection
In addition to the start protection, the engine control system incorporates
hardware and software limits to prevent overpressure or overspeed of the
engine. Limit protections are provided within the FADEC software for
fan speed, core speed, fuel flow and HP compressor discharge pressure.
The system also includes an independent rotor overspeed protection
system (OSP) to prevent catastrophic engine failure due to failure modes
not controllable by the FADEC system.
Engine Ignition System
The engine ignition system is self-contained and is automatically
controlled by the FADEC. It consists of a dual channel ignition exciter,
leads, and two igniters. The ignition exciter features a "burst" mode
which produces a higher spark rate for a brief period following power
application. The ignition system is automatically controlled by the
FADEC for starting and also incorporates an automatic re-light feature.
HJ1-29000-005-001
October 30, 2016 1-80
FOR TRAINING PURPOSES ONLY