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2. Examine the engine for hydraulic lock which is a condition where fluid accumulates in the
induction system or the cylinder assembly. Refer to Chapter 05-50 of the IO-390-D Series
Engine Maintenance Manual for details.
CAUTION
3. Refer to the aircraft POH for the engine start settings and start procedure.
4. Set the alternate air control to the OFF position.
5. Set the propeller governor to FULL RPM.
6. Turn the fuel valve ON in accordance with the aircraft POH.
7. Open the throttle approximately to 1/4 travel.
8. Turn the boost pump ON.
9. Move the mixture control to FULL RICH until a slight but steady flow is indicated
(approximately 3 to 5 seconds) and return the mixture control to IDLE CUT-OFF.
10. Set the magneto select switch per the aircraft manufacturer's instructions.
NOTICE: For switch information, refer to the aircraft manufacturer's handbook.
CAUTION
NOTICE: A low battery, engine speed less than 50 rpm, or sub-zero temperatures can prevent
engine start. Refer to the section "Apply Heat to a Cold Engine" in the "Engine
Conditions" chapter.
11. Energize the starter (not to exceed 10 seconds) until the engine starts.
12. Look at the oil pressure gage. If either you do not see oil pressure (greater than 0) indication
within 10 seconds after engine start or oil pressure does not continue to increase above the
published minimum pressure in the next 20 seconds, stop the engine. Identify and correct the
problem before another engine start.
13. Put the magneto switch in the BOTH position.
14. Move the mixture control slowly and smoothly to FULL RICH.
CAUTION
Engine Operation
Page 36
IO-390-D Series Engine Installation and Operation Manual
DO NOT OPERATE THE ENGINE IF HYDRAULIC LOCK IS POSSIBLE.
HYDRAULIC LOCK CAN CAUSE ENGINE DAMAGE. DO NOT
CONTINUE TO OPERATE A MALFUNCTIONING ENGINE TO
PREVENT ADDITIONAL DAMAGE TO THE ENGINE, POSSIBLE
BODILY INJURY OR DEATH.
DO NOT ENERGIZE THE STARTER FOR PERIODS OVER 10
SECONDS. LET THE STARTER COOL FOR 30 SECONDS AFTER
EACH ENERGIZATION. IF THE STARTER FAILS TO ENERGIZE
AFTER TWO ATTEMPTS, IDENTIFY AND CORRECT THE CAUSE.
DO NOT TRY MORE THAN FIVE ENGINE STARTS WITHIN A 2-
MINUTE PERIOD.
DO NOT EXCEED THE IDLE RPM (SET BY THE AIRCRAFT
MANUFACTURER) UNTIL THE OIL PRESSURE IS STABLE ABOVE
THE MINIMUM IDLING RANGE. IF THERE IS NO INDICATION OF
OIL PRESSURE WITHIN 10 SECONDS, STOP THE ENGINE.
IDENTIFY AND CORRECT THE CAUSE. REFER TO CHAPTER 12-30
IN THE IO-390-D SERIES ENGINE MAINTENANCE MANUAL.
COMPLETE SMOOTH AND STEADY THROTTLE MOVEMENTS.
FULL RANGE THROTTLE MOVEMENT IN LESS THAN 2 SECONDS IS
TOO RAPID AND CAN CAUSE SUBSEQUENT ENGINE DAMAGE.
© 2020 Avco Corporation. All Rights Reserved
March 2020
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