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IO-390-D Series Engine Installation and Operation Manual
CAUTION
5. If cowl flaps are installed, open the cowl flaps to prevent heat build-up.
6. Between intervals, make sure the engine stays warm and keeps the heat. Make sure there is
no damage from heat build-up.
7. During the last 5 minutes of the heat process, apply heat to the top of the engine.
8. Start the engine immediately after the hot air application. Also, refer to additional engine start
information in the section "Cold Weather Start" in this chapter.
Cold Weather Engine Start
NOTICE: The following is Lycoming Engine's recommended procedure for cold weather engine
starts. Refer to the aircraft manufacturer's Pilot's Operating Handbook (POH) for in-
flight recommendations during cold weather.
1. After a cold start, do not rapidly increase acceleration or exceed the idle rpm. Allow up to 1
minute for oil pressure to become stable above 1000 rpm, since oil lines to the gage can stay
cold. If oil pressure indication is not shown within 10 seconds, stop the engine. Identify and
correct the cause. If no leaks or damage are found, complete the pre-heat application again
before engine start.
2. Let the engine warm up at 1000 rpm until oil pressure and temperature are stable within
operating limits, identified in Appendix A.
3. Complete a ground check in accordance with the aircraft manufacturer's POH.
4. Complete a cycle of the propeller control position in accordance with the aircraft and
propeller manufacturer's instructions to make sure warm oil is in the propeller dome.
5. 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).
CAUTION
• Engine roughness
• Low, high or surging rpm or fluctuations
• High, low, or fluctuating oil pressure
6. Make sure that when take-off power is applied smoothly, oil pressure, fuel flow, manifold
pressure, and rpm remain stable.
Engine Operation in Hot Weather
During engine operation in hot weather (temperatures above 90°F (32°C)):
A. Monitor oil and cylinder temperatures as per Appendix A.
B. Operate the engine with cowl flaps fully open.
C. Do not operate the engine at maximum power any longer than necessary to make the climb
configuration recommended by the aircraft manufacturer.
D. Operate at sustained sufficient airspeed to cool off the engine.
© 2020 Avco Corporation. All Rights Reserved
March 2020
APPLY THE HOT AIR UNIFORMLY AND NOT CONCENTRATED IN
ONE SPOT TO PREVENT HEAT DAMAGE TO NON-METAL PARTS.
HEAT BUILD-UP CAN CAUSE DAMAGE TO WIRING, HOSES, ETC.
DO NOT TAKE-OFF IF ANY OF THE FOLLOWING CONDITIONS ARE
OBSERVED:
• High or low fuel flow
• High manifold pressure
• Low battery charge.
Engine Conditions
Page 43
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