Piper PA-24 Comanche Service Manual page 192

PIPER COMANCHE SERVICE
MANUAL
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sEcnON VI
LANDIN(i (if U AND BRAKE SYSTEM
6-1.
Incroduction. Contained in this section are inscructions for tr'Oublcsboocint. overhaul. inspection and
adju.stment of the PA-24-180. PA-24-0250;'PA-24-Z60 and PA-240400iandinl
par.
landint
,car tctnction
system and brake system. Also, adjumnena (or the ciemica1
safety,
down limit. up limit and warning
switches.
6-2.
Description.
The PA·24 Comanche tricycle
landiq
JCI1'
sy.em is
an
air-oil oleo type unit that is
electrically operated. fully retractable with the aese ,car
retn.ct:inI
aft iDto the
GOIC
section and the main
gear
mractinl inboard into the wing.
Gear
doon operated by
par
movement pvti&l1y cover the par when
retracted.
The retraction mechanism consistS of
an
electric mocor and traDSmission assembly. torque tube
assembly, push-pull cables to each main
aar
and
a push-pull
tuM
co the nose
,ear.
Limit switches arc
installed in the system to cut off the tnIUIIUssion motor when the pat is fuUy cxtenclcd or tctracted. These
switches also operate
par
indicator
liFts
in the cabin. To prevent the
gar
from retracting while the
airplane is on the ,round. an anti-retraction safety switch located on the left main par will not allow the
,eu to retract until weight off the
gear
hu allowed the st:Nt to exrcnd to within three-quarters of an inc:h
of full extension. When the manifold pressure is reduced below 10 to 12 inches and the landing gear is not
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down and locke4. a waminl hom
will
sound. In the cockpit. located bct'ween the pilot seats. under the
floor panel.
15
an extension handle used to manually extend the Iandm, gear while in night should It
become necessary. Also. it may be \\SCCI to extend and
retraCt
the
,ear
when the airplane is on jacks.
The brakes are hydraulically actUated by one muter cylinder on the early models and individual muter
cylinders mounted on the left (optional on the rilht} set of rudder pedals on the late models.
A
reservoir.
located on the forward side of the firewall. supplies hydraulic fluid to the muter cylinder, From the
cylinder the fluid is routed thr0ueh lines and bOla to a parkinc brake valve located under the floor panel In
front of the left pilot's seat on the early models. or on the muter c;ylindm of late models. The rluid is then
directed to the bra.ke assemblies on each main landinJ ,car. The brakes arc self·adjumn,. singie-disc. smgle
housing, double piston usemblies. To operate the brakes. pull the brake lever back on the early models
and
apply
toe
pressure to the tOP of the brake pedals on the late models. The parking brake may be actUated by
applying the braKes and pulling out the parkin, brake handle. To release the puking brake. apply the
brakes and push in on the parking brake handle.
6-3. TroublcshooQn', Troubles peculiar to the landing
gat
system are listed in Table VI·II at the back
of this secnon, along with their probable causes and' S\IIIcstcd remedies. When troubleshooung. check the
power supply and ground of the items aifeC:tcd.
If
no ttouble is found. the trouble probably exists
inside
:ndividual pieces of equipment.
64.
Landing
Gear
System.
LANDING GEAR AND BRAKE SYSTEM
ISSUED: 8/18112
IH22
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