Step 5. Stop The Engine - Lycoming IO-360-N1A Installation And Operation Manual

5. Operate the engine at maximum power mixture for performance cruise powers and at best
economy mixture for economy cruise power; unless otherwise specified in the POH. Refer to
Appendix A.
6. During let-down flight operations, it could be necessary to manually lean fuel-injected
engines for smooth operation.
A. Leaning to EGT (Normally aspirated engines with fuel injectors or carburetors).
(1) Maximum Power Cruise (approximately 75% power) - Never lean beyond 150ºF on
rich side of peak EGT unless the aircraft operator's manual shows otherwise. Monitor
cylinder head temperatures.
(2) Best Economy Cruise (approximately 75% power and below) - Operate at peak EGT.
B. Leaning to Flowmeter.
Lean to applicable fuel-flow tables or lean to indicator marked for correct fuel-flow for
each power setting.
C. Leaning with Manual Mixture (economy cruise, 75% power or less without flowmeter or
EGT gage).
(1) Slowly move the mixture control from FULL RICH to LEAN.
(2) Continue leaning until a slight loss of power occurs (engine roughness could occur).
(3) Enrich until the engine operates smoothly and power is restored.

Step 5. Stop the Engine

1. With the aircraft on the ground, set the propeller at minimum blade angle.
2. Keep the engine speed between 1000 to 1200 rpm, until the operating temperatures are stable
and EGT is approximately 1100ºF (593ºC).
3. Move the mixture control to IDLE CUT-OFF.
4. After temperatures are stable and the engine stops, set the ignition switch to the OFF
position.
5. Turn the Fuel Selector to the OFF position.
6. Refer to the aircraft manufacturer's POH for additional information.
Engine Start and Operation
Page 30
DO NOT MANUALLY TURN THE PROPELLER ON A HOT ENGINE
EVEN THOUGH THE IGNITION SWITCH IS IN THE OFF POSITION.
THE ENGINE COULD KICK BACK AS A RESULT OF AUTO-IGNITION
CAUSED BY A SMALL AMOUNT OF FUEL REMAINING IN THE
CYLINDERS. AUTO-IGNITION COULD RESTART THE ENGINE AND
CAUSE SERIOUS BODILY INJURY OR DEATH.
IO-360-N1A Engine Installation and Operation Manual
© 2016 Avco Corporation. All Rights Reserved
February 2016