Operation & Maintenance Manual
CD-135 / CD-155
OM-02-02
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02-OM-07-02
4
30.07.2014
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6
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7 Emergency Procedures
7.1 Power Loss
In the event of power loss, move the load selector fully forward
(takeoff power position) and select a fuel tank with sufficient fuel
level.
7.2 FADEC Operation
The FADEC system consists of two identical and independent
FADEC-halves, which continually monitor each others status.
In normal operation, the manual Force B switch should be
switched to the "A" position. This means that FADEC A (Engine
Control Unit A) is actively controlling the engine, and FADEC B is
in stand-by mode. If the FADEC system detects a problem with
channel A, the FADEC A light begins to flash and the system
automatically switches over to FADEC B. If the FADEC system
detects a problem with channel B, the FADEC B light begins to
flash, and the system automatically switches to whichever
channel is the healthiest.
If the Force B switch is in the "B" position, only FADEC B will be
allowed to actively control the engine. In this position, the FADEC
system cannot switch automatically between channel A and B.
This position is necessary only if the FADEC system does not
switch automatically to the healthiest channel in the event of
abnormal engine behavior.
CAUTION: If the FADEC has been operated by the battery only, a
temporary decrease of the rotational speed is possible by
switching on the Alternator. In any case leave the Alternator
switched on.
Note: The following steps must be taken in the event of power loss or
engine failure!
WARNING: It is strongly recommended to always operate with the Force B
switch in the "A" position, as this will allow the FADEC system to
choose automatically the healthiest channel.
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