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7. Decrease the power control back to 1200 rpm over 2 minutes. Allow the engine to stabilize
and continue to operate.
8. Reset the EEC/ECU circuit breaker. Decrease the power control to IDLE and allow the
engine to stabilize.
9. Continue to "Step 6. Complete the Pre-Flight Test" section in this chapter.
Step 6. Complete the Pre-Flight Test
The Pre-Flight Test (PFT) is done during engine run-up before flight to make sure that:
• The engine is operating correctly
• Both ECU channels are operating correctly to control the engine
• There are no latent failures on the secondary channel of the ECU before each flight.
The PFT takes approximately 1 minute and allows the secondary channel to control each actuator.
The EECS ensures the ignition, fuel, and turbocharger controls on each of the two channels are
operating correctly. During this test, the EECS identifies any faults.
Before this test, the following enable criteria must be met to complete the PFT:
• The rpm must be set to 1800
• Average CHT between 140ºF and 425ºF (60ºC and 218ºC)
Before the PFT, the EECS activates Built-In-Tests (BITs). The BITs are sequences that are pre-
programmed in the EECS software to look for unacceptable conditions in the engine. After all BITs
are acceptable, the EECS enables the PFT.
NOTICE: Complete the pre-flight test when the aircraft is still on the ground.
To start the pre-flight test:
1. Point the aircraft into the wind.
2. Make sure the alternator reading is correct.
3. Set the power control to 1800 rpm.
CAUTION
4. All of the following criteria must be met to enable the pre-flight test to start when the PFT
button is pressed in the next step:
• Engine speed is 1800 rpm
• Oil pressure in green
• Oil temperature in green.
NOTICE: If the PFT button is pressed and held down, the pre-flight test will not begin because
the EEC system will assume the PFT button is stuck.
5. Momentarily press and release the PFT button. (Do not press the PFT button again - the pre-
flight test will stop.) The PFT annunciator will illuminate. The automatic pre-flight sequence
will take approximately 70 seconds. The rpm, manifold pressure, and other engine
parameters could change during the pre-flight test.
Engine Initiation
Page 54
DO NOT MOVE THE POWER CONTROL DURING THE NEXT STEP.
TEO-540-A1A Engine Installation and Operation Manual
© 2018 Avco Corporation. All Rights Reserved
October 2018
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