Honda Aircraft Company
HA-420
SYSTEMS
POM
DESCRIPTION
HJ1-29000-005-001
October 30, 2016
1-79
When the TLA falls within the angle ranges associated with one of these
ratings, the engine control system will control the engine to achieve the
target engine speed based on ambient conditions. Separate power setting
schedules have been incorporated into the software for the different bleed
levels.
When the TLA does not fall within the angle ranges associated with one
of these “detents,” commanded N
1
will be interpolated between the
IDLE and MCT ratings such that engine net thrust is approximately
linear with TLA.
The following four idle modes are available:
•
Ground idle
•
Anti-ice ground idle
•
Flight idle
•
Ground APU mode
The FADEC will select between the idle modes based on the weight-on-
wheels and whether engine and/or wing ice protection is selected on.
Ground APU Mode
The engine control system includes a ground APU mode that
automatically increases the ground idle speed when one engine is
operating in order to provide sufficient speed for a single generator to
provide ground electrical power. When the second engine is started, the
first engine automatically transitions to normal ground idle speed.
Takeoff Lock
The FADEC control logic incorporates a takeoff lock feature to minimize
variation in thrust during takeoff. The takeoff lock is activated shortly
after takeoff thrust is set and clears shortly after takeoff.
FOR TRAINING PURPOSES ONLY
