IV-18
February 2008
Legacy
IV-19
February 2008
Legacy
ENGINE CONSIDERATIONS
Very cold temperatures require extra considerations for engine starting and op-
erations. The engine oil will be significantly more viscous resulting in higher oil
pressures, slower indication upon starting, increased engine wear, tappet noise (if
equipped with hydraulic lifters) poor battery performance, etc.
During extreme cold weather it may be necessary to preheat the engine, oil and
battery before starting. Since the engines are cooled by pressurized air created
in flight, ground operations must be minimized at high ambient temperatures and
conducted with care at all times.
Engine operations should be into the wind when possible. The mixture should be
RICH. Avoid prolonged idling and do not exceed 2200 rpm on the ground. Warm
up should be at 1000-1200 rpm.
The engine is warm enough for take-off when the throttle can be opened without
faltering. Take-off with a turbocharged engine should not be started if indicated
lubricating oil pressure, due to cold temperatures is above maximum. Excessive
oil pressure can cause overboost and consequent engine damage.
CRUISE OPERATION
Cold weather cruise operation may require an occasional cycle of the propeller
control. This could be particularly true after long duration cruise just prior to de-
scent where lack of governor control could cause overspeeding. During descents
and landing, give special attention to cylinder head temperatures, since the engine
will easily over cool.
ICING CONDITIONS
Flight in icing conditions is prohibited.
Should ice be inadvertently encountered it can be expected that drag will increase,
possibly markedly, stall speeds will increase, again possibly significantly, and
extreme care must be exercised while ice is present on the airframe. It is prudent
to avoid icing conditions if at all possible.
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