Lycoming TIO-540-A1A, Operator'S Manual

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SECTION 3 LYCOMING OPERATOR’S MANUAL
OPERATING INSTRUCTIONS TIO-540 SERIES – ANGLE VALVE CYLINDER HEADS
(3) If the RPM drop exceeds 175 RPM, slowly lean the mixture until the RPM peaks. Then retard the
throttle to the RPM specified in step e. (1) for the magneto check and repeat the check. If the drop-
off does not exceed 175 RPM, the difference between the magnetos does not exceed 50 RPM, and
the engine is running smoothly, then the ignition system is operating properly. Return the mixture
to full rich.
f. Do not operate on a single magneto for too long a period, a few seconds is usually sufficient to check
drop-off and will minimize plug fouling.
7. OPERATING IN FLIGHT.
a. Subject engines are equipped with a dynamic counterweight system and must be operated accordingly.
Throttle movements from full power to idle or from idle to full power are full range movements. Full
range throttle movements must be performed over a minimum time duration of 4 seconds. Performing
a full range throttle movement at a rate of less than 2 seconds is considered a rapid or instant
movement. Performing rapid movements may result in detuned counterweights which may lead to
failure of the counterweight lobes and subsequent engine damage.
b. See airframe manufacturer’s instructions for recommended power settings.
c. Fuel Mixture Leaning Procedure.
Improper fuel/air mixture during flight is responsible for many engine problems, particularly during
take-off and climb power settings. The procedures described in this manual provide proper fuel/air
mixture when leaning Lycoming engines; they have proven to be both economical and practical by
eliminating excessive fuel consumption and reducing damaged parts replacement. It is therefore
recommended that operators of all Lycoming aircraft power-plants utilize the instructions in this
publication any time the fuel/air mixture is adjusted during flight.
Manual leaning may be monitored by exhaust gas temperature indication, fuel flow indication, and
by observation of engine speed and/or airspeed. However, whatever instruments are used in leaning
the mixture, the following general rules should be observed by the operator of Lycoming aircraft
engines.
GENERAL RULES
Never exceed the maximum red line cylinder head temperature limit.
For maximum service life, cylinder head temperatures should be maintained below 435°F (224°C) during
high performance cruise operation and below 400°F (205°C) for economy cruise powers.
All take-offs are to be made with the mixture controls in the full rich position regardless of field elevation.
Turbocharging permits the engine to develop rated power regardless of field elevation. However, it may be
necessary to manually lean the engine for ground operation at idle or off idle engine speeds.
Leaning during climb, usually 85% of rated power, is permitted only if and to the limits described in the
aircraft operator’s handbook. Engine temperature instruments must be monitored and temperatures must be
maintained within the prescribed limits.
During let-down flight operations it may be necessary to manually lean engine to obtain smooth
operation.
On turbocharged engines never exceed 1650°F turbine inlet temperature (TIT).
1. LEANING TO TURBINE INLET TEMPERATURE OR EXHAUST GAS TEMPERATURE GAGE.
a. Turbocharged engines.
3-4 Revised January 2013