© 2018 Avco Corporation. All Rights Reserved
Engine Operation
October 2018
Page 65
TEO-540-A1A Engine Installation and Operation Manual
(7)
All cylinders operate correctly when only the primary sparks are enabled and the
fueling is set to a specified air-fuel ratio
(8)
All cylinders operate correctly when only the secondary spark is enabled and the
fueling is set to a specified air-fuel ratio
B.
The EECS enables and disables each pre-flight test in sequence through calibration. The
EECS continues the pre-flight test to completion even if the expected system response
does not occur.
NOTICE:
Allow sufficient time for the pre-flight test to complete (as shown by the PFT
annunciator) before making any power control changes. Otherwise the pre-flight
test could be inadvertently cancelled with no other indication that the check is
incomplete.
C.
If the PFT annunciator:
(1)
Never came on, the pre-flight test did not run.
(2)
Blinks, the pre-flight test was aborted. Press the PFT button momentarily to
acknowledge that the check was not completed. After an aborted start PFT, wait 5
seconds after re-establishing correct engine speed and ensure average CHT is
within limits before pressing the PFT button again.
D.
Once the pre-flight test starts, it will abort if any of the following occur:
•
Power control changes more than ± 5% from where it was at the start of the sequence
•
Engine speed goes below 1000 rpm
•
Engine speed goes above 2300 rpm
•
Engine load goes below 15%
•
Average
CHT goes below 140º (60ºC)
•
Average CHT goes above 425ºF (218ºC)
•
If the PFT button is pressed while the pre-flight test is running.
6.
During pre-flight test, monitor the following:
•
Ignition Check
- engine speed will dip twice as each half of the redundant ignition system
is disabled and then re-enabled, deactivating half of the spark plugs during each check
•
Primary Fuel Injector Test
- engine speed will decrease slightly and then recover
•
Primary Turbocharger Test
- manifold pressure will briefly increase slightly
•
Primary Propeller Control Cycle
- the propeller will briefly operate in a cycle to coarse
pitch and decrease the rpm, then go back to fine pitch
•
Secondary Fuel Injector Test
- engine speed will decrease slightly and then recover
•
Secondary Turbocharger Test
- manifold pressure will briefly increase slightly
•
Secondary Propeller Control Cycle
- the propeller will briefly operate in a cycle to
coarse pitch and decrease the rpm, then go back to fine pitch
