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full in,
it
should lllumlnate. The indicator lights contain dimming
shutters tor night operation.
As an additional reminder that the gear Is retracted, a warning horn
sounds whenever either throttle is retarded with the gear up.
LANDING GEAR POSITION HANDLE.
The gear position handle has two neutral positions (slightly above
center for gear up, and slightly below center for gear down) which give
a mechanical indication of the gear position. From either pOSition, the
handle must be pulled out to clear a detent before
it
can be repositioned;
operation of the gear and doors will not begin until the handle has been
repositioned.
To reposition the gear, the handle is pulled out and moved to the de
sired position, then released. Pressure is created in the system by the
engine-driven hydraulic pump (pumps) and the gear is actuated to the
selected position. A detent in the gear handle system holds the handle
in the operating position until the cycle is completed; then the handle
automatically returns to neutral and pressure in the system is relieved.
IMPORTANT
The landing gear pOSition handle should be returned to neu
tral manually if a malfunction occurs in the hydraulic sys
tem which prevents the gear position handle from returning
to neutral after a cycle has been completed. Continuous
operation with the handle out of neutral keeps the system
pressurized and will eventually result in overheating and
possible damage.
During a normal cycle, the gear locks up or down and the position
indicator light comes on. When the light illuminates, hydraulic pressure
is switched from the gear actuators to the door actuators to close the
gear doors. When the doors are closed, the gear handle returns to neu
tral and the cycle is complete. The normal time interval between the in
dicator lighting and the handle returning to neutral is 3-9 seconds. H the
pOliUon indicator light does not light, the gear doors will not close and
hydraullc pressure will be retained on the landing gear actuators.
A I&fety switch, actuated by the nose gear strut, restricts the gear
po.Ulon handle to prevent inadvertent retraction whenever the nose gear
.trut II compressed by the weight of the airplane.
1·14
EMERGENCY HAND PUMP.
For emergency use,
if
the engine-driven hydraulic pump (pumps)
fails, a manual pump on the cabin floor between the front seats may be
used to extend the gear. The system reservoir is arranged to retain
sufficient fluid to extend the gear with the hand pump
if
a failure between
the engine-driven pump (pumps) and reservoir results in fluid loss. See
Section
ill
for emergency operation of the hand pump.
OPERATION OF LANDING GEAR DOORS (AIRPLANE ON GROUND).
For inspection purposes, the landing gear doors may be opened and
closed while the airplane is on the ground with the engine stopped. Oper
ate the doors with the landing gear handle in the "down-neutral" position.
To open the doors, turn off the master switch and operate the hand pump
until the doors open. To close the doors, turn the master switch on and
operate the hand pump.
NOTE
The poSition
of
the master switch for gear door oper
ation is easily remembered
by
the following rule:
OPEN circuit
=
OPEN doors
CLOSED circuit
=
CLOSED doors
PARKING BRAKE SYSTEM.
A double-button push-pull control knob, located below the left hand
.witch and control panel, is used to set the hydraulic parking brakes.
Simply apply pressure to the brake pedals, and, at the same time, squeeze
the buttons of the parking brake control knob and pull the knob out. H
deSired, the brake pedals may be "pumped" to insure an absolute "full
pedal" after setting the brake knob. To release the parking brake, push
the control knob in.
CABIN HEATING, VENTILATING AND
DEFROSTING SYSTEM.
Three levers located on the lower right side of the instrument panel
2-1~i
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