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THE MOST CURRENT DOCUMENT INFORMATION IS AVAILABLE
FROM YOUR BELL HELICOPTER TEXTRON REPRESENTATIVE.
PRODUCT DATA
JANUARY 2003
FADEC SYSTEM OPERATIONAL FEATURES
Features of the FADEC are listed below:
GAS GENERATOR (NG) GOVERNOR
In the auto mode the pilots PLA (throttle) controls the set point for the NG governor.
This allows the pilot to limit engine power as desired and provides smooth transition
from NG governing at ground idle to power turbine speed (NP) governing at flight idle.
Normal flight operations shall be conducted with the throttle twist grip at 100% travel.
If desired, the PLA (throttle) can be rolled back to force a power turbine speed/helicopter
rotor speed (NP/NR) needle split for autorotation training.
POWER TURBINE (NP) GOVERNOR
The ECU governs NP to maintain helicopter rotor speed (NR) at the set point. The control
utilizes isochronous speed governing with gains and compensation optimized for the
engine installation. A collective pitch position analog input signal provided by the airframe
provides load anticipation for the NP speed governor. This anticipation initiates NG
acceleration after collective pitch movement prior to actual load increase, thus reducing
rotor speed droop.
Summary of Contents for BELL 430
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