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quired and the decreased battery output at low temperatures.
The starting procedure is normal; however, if the engines do
not start immediately, it may be necessary to position the
primer switch to LEFT or RIGHT for 5 to
10
seconds.
After a suitable warm-up period (2 to 5 minutes at
1000
RPM, if preheat is not used) accelerate the engines several
times to higher RPM.
The propellers should be operated
through several complete cycles to warm the governors and
pr0peller hubs.
If the engines accelerate smoothly and the
oil pressure remains normal and steady, the aircraft is ready
for takeoff.
During operation in cold wet weather, the possibility of
brake freezing exists; therefore, special precaution should
be taken.
If ice is found on the brakes during preflight
inspection, heat the brakes with a ground heater until the
ice melts and all traces of moisture are removed.
If a
ground heater is not available, spray or pour isopropyl
alcohol (MIL-F-5556) on the brakes to remove the ice.
CAUTION
If brakes are deiced using alcohol, insure
alcohol has evaporated from the ramp prior
to starting engines as a fire could result.
If neither heat nor alcohol is available, frozen brakes
can sometimes be freed by cycling the brakes assymetrically
while applying engine power.
Caution should be exercised if
the aircraft is setting on ice or in close proximity to other
parked aircraft.
After takeoff from slush covered runways or taxiways,
leave landing gear down for a short period to allow wheels to
decelerate.
This will allow centrifugal force to throw off
any accumulated slush which should preclude frozen brakes on
landing.
Insure wheels are stopped before retracting gear to
prevent buildup of ice or slush in the wheel wells.
During cruise the propellers should be exercised at
half-hour intervals to flush the cold oil from the governors
and propeller hubs.
Electrical equipment should be managed
to assure adequate alternator charging throughout the flight,
since cold weather adversely affects battery capacity.
2-17
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