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TEO-540-A1A Engine Installation and Operation Manual
Step 5. Engine Operation
CAUTION
DO NOT TAKE-OFF IF ANY OF THE FOLLOWING CONDITIONS ARE
FOUND:
• Engine roughness
• Low, high, or surging rpm or fluctuations • Low battery charge.
• High, low, or fluctuating oil pressure
• High or low fuel flow
1. Before take-off, monitor the oil pressure, oil temperature, and cylinder head temperature to
make sure all are within their operating ranges (as specified in Appendix A).
2. Make sure that when take-off power is applied smoothly, oil pressure, fuel flow, manifold
pressure, and rpm remain stable.
NOTICE: After 25 hours of operation, change the oil. Examine the oil filter and screen. Refer
to Chapter 12-10 in the TEO-540-A1A Engine Maintenance Manual.
3. Operation in Flight
NOTICE: Although the EECS continuously monitors and adjusts ignition timing, fuel injection
timing, and fuel mixture, and propeller governor setting based on operating
conditions, continue to monitor engine functions during engine operation.
A. See the aircraft manufacturer's instructions for recommended power settings.
B. Until oil consumption has stabilized after the first 50 hours of flight, cruising is to be
done at not less than 65% power to ensure correct seating of the rings.
4. Recommendations to Prevent Spark Plug Fouling
Lead deposits can collect on the spark plug electrodes when the engine operates at lower-
than-specified temperatures with fuel-rich mixtures (fuel-rich mixtures do not enable
vaporization of lead in aviation gas). These deposits can cause misfiring.
When operating the engine, the following steps can be taken to prevent spark plug fouling
and misfiring:
• Operate the engine between 1000 and 1200 rpm after engine start and during warm-up.
(At these speeds the spark plug core temperatures are sufficiently hot to activate the lead
scavenging agents to prevent lead deposits on the spark plugs and exhaust valve stems.)
• Operate the engine at the specified operating temperature to prevent low temperature
operation.
• Avoid rapid power reduction in flight to prevent sudden engine cooling.
• Do not stop the engine immediately after landing to prevent rapid engine cooling.
• Before engine shutdown, operate the engine between 1000 and 1200 rpm until operating
temperatures are stable and EGTs drop below 1100°F (593°C). Then increase engine
speed to 1800 rpm for 15 to 20 seconds. Then decrease engine speed to between 1000 and
1200 rpm before engine shutdown.
© 2018 Avco Corporation. All Rights Reserved
October 2018
• High manifold pressure
• NTO annunciator is illuminated
Engine Operation
Page 67
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