Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 832 / 1956

PAGE 6
Feb 28/07
4F6
32-40-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
C. Cleaning, Inspection, and Repair (See Figure 4):
(1) Clean the assembly with a suitable solvent and dry thoroughly.
(2) Check the wall of the cylinder housing and piston for scratches, burrs, corrosion, etc, that may
damage O-rings.
(3) Check the general condition of the brake bleeder screw and lines.
(4) Check the brake disc for wear, grooves, scratches, or pits. The minimum disc thickness of Disc
164-46 used on Wheel Assembly 40-120C is .405. A single groove or isolated grooves up to
.030 of an inch deep would not necessitate replacement, but a grooving of the entire surface
would reduce lining life and would necessitate replacement of the disc. Should it be necessary
to remove the wheel disc, see Main Wheel Assembly - Removal and Disassembly.
(5) To remove the snap-on type lining used on the brake assemblies may be by prying loose with a
screwdriver or a thin flat wedge. Install the snap-on type lining by positioning onto the pins and
applying pressure to snap into position.
(6) If a powdery rust appears on the brake disc, one or two taxi braking applications should wipe
the disc clear. Rust allowed to progress beyond this point may require removal of the disc from
the wheel assembly to properly clean both faces. Wire brushing followed by sanding with 220
grit sandpaper can restore the braking surfaces for continued use.
NOTE: To inspect the linings, check the expansion groove. If the groove is not showing,
replace the lining.
NOTE: Replacement brake linings (metallic) used on the brake assembly should be
conditioned by performing three hard braking applications at 45 to 50 mph. Do not
allow the brake discs to cool substantially between stops. This will wear off any high
spots and at the same time generate sufficient heat to glaze the surface of the metallic
linings. Once the linings are glazed, they will provide many hours of maintenance free
service.
7. Toe Brake Cylinder Assembly (See Figure 6.)
A. Removal
WARNING: MAKE CERTAIN AIRPLANE IS PARKED ON LEVEL GROUND WITH WHEELS
CHOCKED.
CAUTION: USE PARKER HANNIFIN REPLACEMENT BRAKE CYLINDERS ONLY.
GAR-KENYON AND PARKER HANNIFIN BRAKE CYLINDERS ARE NOT
INTERCHANGEABLE. PILOT’S LEFT AND RIGHT CYLINDERS MUST BE THE
SAME MANUFACTURER. COPILOT’S LEFT AND RIGHT CYLINDERS MUST BE
THE SAME MANUFACTURER. SEE PIPER PARTS CATALOG, P/N 761-878.
(1) Place chocks under main and nose wheels.
(2) Release parking brake.
(3) Disconnect and quickly cap upper and lower hydraulic lines from cylinder assembly being
removed.
(4) Disconnect clevis from rudder pedal by removing cotter pin and pin.
NOTE: The rod and ring subassembly may be removed at this time without fur ther
disassembly of the toe brake assembly. Refer to Disassembly, Repair, and Installation,
below, steps (1) and (2) for rod and ring removal instructions and steps (9) and (10)
for installation. (See also the CAUTION above step (9).)
(5) (Inboard toe brake assemblies only.) Remove nut, bolt, and washer holding nose wheel
steering rod assembly to pedal.