Cessna 402C - Page 98

SECTION 4
NORMAL PROCEDURES
(AMPLIFIED PROCEDURES)
~~l402C
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 propeller hubs. If the engines accelerate smoothly and the
oil pressure remains normal and steady, the airplane is ready for takeoff•
...-----1 WARNING ~---...,
The wings and tail surfaces must be clear of ice,
snow and frost prior to takeoff as flight charac-
teristics can be adversely affected•
.--------NOTE---------,
The waste gate actuators will not operate satisfac-
torily with engine oil temperatures below the lower
limit of the operating range 23.g
o
C (75
0
F).
With
oil temperatures near the bottom of the operating
range, the
throttle motions should be very slow and
care exercised to prevent exceeding the 39.0 inches
Hg. manifold pressure limit. ~
During operation in cold wet weather, the possibility of brake freezing
exists; therefore, special precautions 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-
5566) on the brakes to remove the ice.
.------[au!@i\-----...,
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 are available, frozen brakes can sometimes
be freed by cycling the brakes asymmetrically while applying engine power.
Caution should be exercised if the airplane is setting on ice or in close
proximity to other
parked airplanes.
After takeoff
from slush-covered runways or taxiways, leave landing gear
down for a short period, allowing wheels to spin. This will allow centrif-
ugal force to throw off any accumulated slush which should preclude frozen
brakes
on landing. Insure wheels are stopped before retracting wheels 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 through-
out the
flight, since cold weather adversely affects battery capacity.