Selkirk College IATPL Program Manual
Beech 95 POH
Effective September 1, 2005
Appendix 14 - 61
Cowl Flaps
Airflow through the pressure cowling is controllable by cowl flaps mounted on the lower
trailing edge of each cowl. Each cowl flap is operated by an electric actuator, which can
fully open or close the cowl flap. Intermediate cowl flap positions are not possible. An
electric switch on the Pilot sub-panel controls each cowl flap. When the switch is down
the cowl flap is open, when up the cowl flap is closed. An amber light on the main panel
illuminates when either cowl flap is open.
Cowl flaps should be open for all ground operations and during takeoffs. In flight the
cowl flaps should be open if cylinder head temperature or oil temperature approach the
maximum normal operating values.
Consistent with engine temperature limits, closing the cowl flaps in cruise or climb will
improve performance.
Propellers
Each engine is equipped with a two-blade, constant-speed, full feathering propeller.
Propeller feathering is accomplished by pulling the propeller control past the detent to the
limit of travel. Un-feathering and restarting in flight is achieved by moving the propeller
control well into the governing range and following the
engine restart in the air
checklist.
Momentary use of the starter to initiate rotation is necessary only at low airspeeds.
Immediately after the engine starts the throttle and propeller controls should be adjusted
to prevent an engine over-speed condition.
FXFG has been modified under STC SA00722CH, which changed the original propeller
model. The propeller models are:
GSAK: Hartzell HC-92WK-2
FXFG: Hartzell HC-C2YK-2CUF/FC7666C(B)-4
Both propellers are 72” in diameter. But the HC
-92WK-
2 can legally be trimmed to 71”
while the HC-C2YK-2CUF/FC7666C(B)-4 may not be trimmed in the field.
The significant difference between the propellers is that the HC-C2YK-
2CUF/FC7666C(B)-4 has a restriction to avoid continuous operation between 2000 and
2350 rpm. Engine rpm may pass through this range as when necessary to speed up or
slow down but pilots must avoid prolonged flight within this rpm range.
The cruise performance charts in section 5 specify cruise at 2400 rpm or above to avoid
any conflict with the above restriction.
Procedures for feathering, unfeathering, propeller overspeed, and all other procedures are
identical for the two propeller installations.
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