Piper COMANCHE PA-24-180 Service Manual page 190

PIPER COMANCHE SERVICE MANUAL
SECTION VI
LANDING GEAR AND BRAKE SYSTEM
6-1. Inroducion.
Contained in this section are insructions for troubieahooing, overhaul, inspection and
adjustment of the PA-24-180, PA-24-250, PA-24-260 and PA-24-0
landing gear. landing gear retracton
system and brake system. Alo, adjusmeno for the electricl sfety, down limit, up limit and warning
switches.
6-2. Desripion. The PA-24 Comnche tricycle landing ger sysem is an air-oil oleo type unit that
electrically operated, fully retracuble with the noe gear retractng aft into the noe section and the main
gear retracting inboard into the wing. Gear doors operated by gea movement partially cover the gear when
retracted.
The retraction mechanism consists of an electric motor and ransmission assembly, torque tube
assembly, push-pull cables to each main gear and a push-pull tube to the nose get. Limit switches are
installed in the system to cut off the transmission motor when the ger is fully extended or retracted. These
switche also operate ge
indicator lights in the cabin. To prevent the gear from retracting while the
airplane is on the ground, in anti-reraction safety switch located on the left main gear will not allow the
gear to reract until weight off the gear hs allowed the strut to extend to within three-quarters of an inch
of full extension. When the manifold pressure is reduced below 10 co 12 inches and the landing ger is not
down and locked, a warning horn will sound. In the cockpit, located between die pilot seas, under the
floor panel, is an extension handle used to manually extend the landing gear while in flight should it
become necessary. Also, it may be used to extend and retract the gear when the airplane is on jacks.
The brakes are hydraulically actuated by one master cylinder on the early models and individual master
cylinders mounted on the left (optional on the right) set of rudder pedals on the ace models. A reservoir.
located on the forward side of the firewall, supplies hydraulic fluid to the master cylinder. From the
cylinder the fluid is routed through lines and hoses to a parking brake valve located under the floor panel in
front of the left pilot's seat on the early models, or on the master cylinders of lace models. The fluid is then
directed to the brake assemblies on each main landing gear. The brakes are self-adjusting, singie-disc, single
housing, double piston assemblies. 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 bv
applying the brakes and pulling out the parking brake handle. To release the parking brake, apply the
brakes and push in on the parking brake handle.
6-3. Troubleshooting. Troubles peculiar to the landing gear system are listed in Table Vl-ll at the
back
of this section. along with their probable causes and 'suggested remedies. When troubleshooting, check the
power supply and ground of the items affected. If no trouble is found, the trouble probably exists inside
individual pieces of equipment.
6-4. Landing Gear System.
LANDING GEAR AND BRAKE SYSTEM
ISSUED: 8/18/72
1H22