N1 speeds of 70% or higher may be required to
keep oil temperature within limits.
b. Engine Starting. Use normal procedures in Section
II. Engine starting under conditions of high ambient
temperatures may produce a higher than normal TGT
during the start. The TGT should be closely monitored
when the condition lever is moved to the LO IDLE position.
If overtemperature tendencies are encountered the condi-
tion lever should be moved to IDLE CUTOFF position
periodically during acceleration of gas generator RPM (N1).
Be prepared to abort the start before temperature limitations
c. Warm-Up Ground Tests. Use normal procedures in
Section II. To minimize the possibility of damage to the
engines during dusty/sandy conditions, activate ICE
VANES if the temperature is below 15°C.
d. Taxiing. Use normal procedures in Section II.
When practical, avoid taxing over sandy terrain to mini-
mize propeller damage and engine deterioration that results
front impingement of sand and gravel. During hot weather
operation, use minimum braking action to prevent overheat-
e. Takeoff. Use normal procedures in Section II.
Avoid taking off in the wake of another aircraft if the run-
way surface is sandy or dusty.
f. During Flight. Use normal procedures in Section II.
g. Descent. Use normal procedures in Section II.
h. Landing. Use normal procedures in Section II.
i. Engine Shutdown. Use normal procedures in
During hot weather, if fuel tanks are completely
filled, fuel expression may cause overflow,
thereby creating a fire hazard.
j. Before Leaving Aircraft. Use normal procedures in
Section II. Take extreme care to prevent sand or dust from
entering the fuel and oil system during servicing. During
hot weather, release the brakes immediately after installing
wheel chocks to prevent brake disc warpage.
8-56. TURBULENCE AND THUNDERSTORM
Due to the comparatively light wing loading,
control in severe turbulence and thunderstorms
is critical. Since turbulence imposes heavy
loads on the aircraft structure, make all neces-
sary changes in aircraft attitude with the least
amount of control pressures to avoid excessive
loads on the aircraft's structure.
Thunderstorms and areas of severe turbulence should be
avoided. If such areas are to be penetrated. it will be neces-
sary to counter rapid changes in attitude and accept major
indicated altitude variations. Penetration should be of an
altitude which provides adequate maneuvering margins as a
loss or gain of several thousand feet of altitude may be
expected. The recommended penetration speed in severe
turbulence is 170 KIAS. Pitch attitude and constant power
settings arc vital to proper flight technique. Establish
recommended penetration speed and proper attitude prior to
entering turbulent air to minimize most difficulties. False
indications by the pressure instruments due to barometric
pressure variations within the storm make them unreliable.
Maintaining a preestablished attitude will result in a fairly
constant airspeed. Turn cockpit and cabin lights on to mini-
mize the blinding effects of lighting. Do not use autopilot
altitude hold. Maintain constant power settings and pitch
attitude regardless of airspeed or altitude indications. Con-
centrate on maintaining a level attitude by reference to the
Flight Director/attitude indicator. Maintain original reading.
Make no turns unless absolutely necessary.
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