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2. Complete specified steps for engine start recommended by the aircraft Pilot's Operating
Handbook (POH), aircraft manufacturer, or Supplemental Type Certificate (STC) holder's
instructions.
WARNING
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. Put the magneto switch in the BOTH position.
13. Move the mixture control slowly and smoothly to FULL RICH.
CAUTION
Engine Initiation
Page 30
IO-390-D Series Engine Installation and Operation Manual
EXAMINE THE ENGINE FOR HYDRAULIC LOCK. REFER TO THE
IO-390-D SERIES ENGINE MAINTENANCE MANUAL. DO NOT
OPERATE THE ENGINE IF HYDRAULIC LOCK IS POSSIBLE.
HYDRAULIC LOCK IS A CONDITION WHERE FLUID
ACCUMULATES IN THE INDUCTION SYSTEM OR THE CYLINDER
ASSEMBLY. HYDRAULIC LOCK CAN CAUSE ENGINE DAMAGE.
DO NOT CONTINUE TO OPERATE A MALFUNCTIONING ENGINE.
OPERATION OF A MALFUNCTIONING ENGINE CAN RESULT IN
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 THE OIL PRESSURE DOES NOT
INCREASE TO THE MINIMUM PRESSURE WITHIN 10 SECONDS,
STOP THE ENGINE. IDENTIFY AND CORRECT THE CAUSE. REFER
TO THE "ENGINE CONDITIONS" CHAPTER IN THIS MANUAL.
© 2020 Avco Corporation. All Rights Reserved
March 2020
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