PIPER
COMANCHE
SERVICE
MANUAL
6-41. Landing Gear
Retraction
System.
6-42.
Principal
or
Operation.
The landing gear
is
a tricycle type. fully retractable through
an
electrically
operated
retraction mechanism The retraction mechanism consists
of
an
electric
motor
and transmission
assembly. torque
tube
assembly. push-pull cables for each main
gear
and
a push-pull tube to the nose gear
Limit switches are installed in the system to shut off the
motor
when the gear
is
fully extended
or
retrac'ted
These switches also
operate
gear indicator lights
on
the Instrument panel.
The landing gear selector switch
is
placed
in
the
up
position activating the retraction
motor
which
operates the transmission.
The
retraction transmission pushes the
torque
arms forward which pull the main
landing gear cables
and
pushes
the
nose gear retraction tube forward. retracting the landing gear When the
gear
is
fully retracted. the
gear
up
limit switch stops the motor and
the
amber
gear up indicator light on the
instrument panel lights The landing gear selector switch
is
then placed
in
the down position. operating the
motor
and
retraction transmission. The transmission pulls the torque arms back which pushes on the main
gear cables and pulls
on
the nose gear
tube
extending the landing gear. When the gear
is
fully extended. the
gear
down
switches
stop
the
motor
and
the green gear down and locked indicator light on the instrument
panel lights.
6-43. Removal
or Gear Retraction Transmission Assembly. (Refer to Figure 6-14.)
a. Remove the gear retraction transmission assembly
by
using the following procedure'
I Place
the
airplane on jacks. (Refer to Jacking. Section
11.)
2.
Roll the carpet back off
the
front center access panel by removing carpet attaChing screws
3 Remove front center access panel
by
removing attaching screws. On airplanes with
Seriall'os
24-4783.24-4804 and up. remove the retraction transmission access
door
located between the two front seats
4.
Disconnect transmission
motor
electrical leads by sliding back the protective covering and
uncoupling the quick disconnect terminals
5 Place
the
emergency retraction release handle (18)
in
the
full up position
6.
Disconnect
the
transmission retraction spring (23) located on the left side
of
the transmission
housing
on
models PA-24-180 and PA-24-250.
Seriall'os
24-3558 and up: and PA-24-260 and PA-24-400
On
models PA-24-180
and
PA-24-250.
Seriall'os
24-1
to
24-3557 the retraction spring (22)
is
located on
the right side of the transmission assembly connected to the brake solenoid brackets
7 Remove the
cotter
pin. washer and pin attaching the tra'nsmission housing
to
the mounting
bracket
8 Remove
the
transmission assembly from the well.
6-44. Cleaning. Inspection
And
Repair
or
Gear Retraction Transmission. (Refer to Figure
6-1
J )
a. Remove the six screws
attaching
the transmission cover (7)
to
transmission housing and remove
the
cover noting the position
of
the
mounting
lug.
b Wipe all old grease from the transmission housing and from the actuator screw (4) and screw nut
(3)
c Check the gear release
arm
(I)
and ascertain that
it
will snap lock
in
place and will require a load of
6
to
12
pounds applied at the end
of
the
arm
to release. Adjust
by
spreading or compressing the
arm
sides at
the
round
head rivets to obtain
proper
fit (early PA-24-180 and PA-24-250 airplanes did not have a
snap
lock
arm
and
requires a strap
to
hold
the
arm
in
place) Once the arm
is
released. ascertain that there
is
no binding
through
its travel.
ISSUED:
8/18/72
1J9
LANDING
GEAR
AND
BRAKE
SYSTEM
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