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SECTION 7
CESSNA
MODEL T210M
AIRPLANE
&
SYSTEMS DESCRIPTIONS
electrically-driven hydraulic power pack will create pressure in the
system and the landing gear will be actuated to the selected position.
CAUTION
If
for any reason the hydraulic pump continues to run after
gear cycle completion (up or down), the 30-amp circuit
breaker switch labeled GEAR PUMP should be pulled out.
This will shut off the hydraulic pump motor and prevent
damage to the pump and motor. Refer to Section 3 for
complete emergency procedures.
During a normal
cycle,
the gear locks up or down and the
position-
indicator light (amber for up and green for down) 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,
pressure
will continue to build until a pressure switch in the door closing system
turns off the hydraulic pump. The gear doors are held in the closed position
by hydraulic pressure.
'
If
system pressure drops below minimum, the
power pack pressure switch will turn the power pack on and return the
pressure to maximum except when the nose gear safety (squat) switch is
open.
A landing gear safety (squat)
switch,
actuated by the nose gear strut,
electrically prevents inadvertent retraction by the electrically-driven
hydraulic power pack, whenever the nose gear strut is compressed by the
weight of the airplane. When the nose gear is lifted off the runway during
takeoff,
the squat switch will close, causing the power pack to operate for 2
to 3 seconds which will return system pressure to maximum in the event
pressure has dropped.
A switch type circuit breaker, mounted on the left sidewall circuit
breaker panel, should be used for safety during
maintenance.
With the
switch pulled out, landing gear operation by the gear motor cannot
occur.
After m
a
intenance is completed, and prior to flight the switch should be
pushed back
in.
For inspection purposes, the landing gear doors may be opened and
closed while the airplane is on the ground with the engine stopped. Operate
the doors with the landing gear lever in the down position. To open the
doors
,
turn off the master switch, pull out the GEAR PUMP circuit breaker
switch, and operate the hand pump until the doors open. To close the doors,
check that the landing gear lever is down, turn on the master switch, and
operate the hand pump until the doors are closed and a high resistance is
felt.
I
WARNING
I
Safety placards are installed on each wheel well door to
7-12
r ' ,
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