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TEO-540-A1A Engine Installation and Operation Manual
EECS Operation
The EECS does not have redundant actuators. It has only one fuel injector per cylinder, one exhaust
bypass valve, and one propeller governor. Both channels (microprocessors) are capable of
controlling the actuators but only one channel within the ECU can control the actuators at a given
time - with the exception of the ignition coils, which are redundant with two per cylinder. Each
channel can control six of the 12 coils, one for each cylinder. The primary and secondary channels
must work simultaneously to control and activate all 12 spark plugs. The channel in control sends
output to the fuel injectors, exhaust bypass valve, propeller governor, and its six ignition coils. The
other channel sends output to its six ignition coils. These outputs control fuel flow, induction
manifold pressure, engine speed, and ignition timing.
The ECU transmits output data through two CAN buses (CAN2 and CAN3) and one RS232 bus
(Figure 6). The CAN2 is used to connect the FST. An RCA female receptacle is required as a
connector for the FST thru CAN2. The FST has a cable with an RCA male jack that mates with this
receptacle.
The CAN3 and RS232 buses transmit engine parameters and EECS operational status information to
the aircraft display. The airframe manufacturer can use either the CAN3 bus or RS232 bus to supply
information necessary for the airframe third party display units.
Figure 6
Engine Control
© 2018 Avco Corporation. All Rights Reserved
System Description
October 2018
Page 5
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