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CAUTION
NOTICE: Full feathering check (twin engine) on the ground is not recommended but a check
of the feathering action can be done by operating the engine between 1000 to 1500
rpm, then momentarily pulling the propeller control into the feathering position. Do
not allow the rpm to drop more than 500 rpm.
4. For engines with a variable pitch propeller, increase the engine speed to approximately 2100
to 2200 RPM and cycle through the propeller pitch setting three times to ensure correct
propeller operation.
5. Move the throttle slowly and smoothly to the IDLE rpm.
Step 4. Engine Operation
CAUTION
DO NOT TAKE-OFF IF ANY OF THE FOLLOWING CONDITIONS ARE
FOUND:
• Engine roughness
• Low, high, or surging rpm or fluctuations • High manifold pressure
• High, low, or fluctuating oil pressure
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. Keep the mixture control at FULL RICH.
3. 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 IO-390-D Series Engine Maintenance Manual.
4. Examine the air filters every other flight for dirt and be prepared to clean or replace them if
necessary.
5. If the aircraft is flown in dusty conditions, more frequent oil changes and air filter
replacements are recommended. Install dust covers over openings in the cowling for
additional protection. Refer to the section "Volcanic Ash" in the "Engine Conditions" chapter
in this manual.
Operation in Flight
1. See the aircraft manufacturer's instructions for recommended power settings.
2. 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.
Fuel Mixture Leaning
• For maximum service life, the Cylinder Head Temperature (CHT) must be maintained below
435ºF (224ºC) during performance cruise operation and below 400ºF (205ºC) for economy
cruise powers.
• Manual leaning can be monitored by exhaust gas temperature indication (if equipped with an
Exhaust Gas Temperature (EGT) gage), fuel flow indication, and by observation of engine
speed and/or airspeed.
Engine Operation
Page 38
IO-390-D Series Engine Installation and Operation Manual
AVOID PROLONGED IDLING. DO NOT EXCEED 2200 RPM DURING
WARM-UP. THE ENGINE IS WARM ENOUGH FOR TAKE-OFF WHEN
THE THROTTLE CAN BE OPENED WITHOUT THE ENGINE
FALTERING.
• High or low fuel flow
• Low battery charge.
© 2020 Avco Corporation. All Rights Reserved
March 2020
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