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

Page: 1412 / 1956

PAGE 4
Feb 28/07
7F14
74-10-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(h) Secure the magneto in this position, alternately tightening the magneto mounting clamps -
first to 8 ft-lbs. and finally to 17 ft-lbs. of torque.
(i) Turn ignition switch OFF.
(2) Inspect harness. See Section 74-20-00.
(3) Inspect P-lead attachment. The P-lead connects the magneto primary circuit to the ignition
switch. If the P-lead is disconnected, the magneto will be “HOT” and will fire the spark plug if
the propeller is rotated. Verify that the P-lead is attached to the condenser stud. Torque to 13 to
15 in-lbs.
(4) Inspect switch wire (left magneto only). This retard breaker lead connects the retard contact
points to the ignition vibrator. If disconnected, the starting circuit will be inoperative. Torque to
13 to 15 in-lbs.
(5) Inspect turbo filter. Look for yellow or red color, condensation, water, or foreign matter in the
filter element. If the filter is contaminated: replace filter; inspect and repair pressurization
system; and remove and inspect magnetos.
(6) Inspect and clean inlet nozzle. Yellow or white particles or any oily film indicates moisture
contamination and possible lack of pressurization. Inspect and repair pressurization system.
(7) Inspect and clean orifice vent. Maximum orifice diameter is .025 inch.
B. Removal
CAUTION: ASCERTAIN THAT THE PRIMARY CIRCUIT OF THE ENGINE IS GROUNDED
BEFORE WORKING ON THE ENGINE.
Before removing the magnetos, make sure the magneto switches are OFF.
WARNING: THE MAGNETO IS NOT INTERNALLY GROUNDED, WHEN THE GROUND LEAD IS
DISCONNECTED THE MAGNETO IS HOT. REMOVING THE HARNESS ASSEMBLY
FIRST AND INSTALLING THEM LAST, MINIMIZES THE DANGER OF STARTING
THE ENGINE ACCIDENTALLY WHEN THE GROUND LEAD IS REMOVED FROM
THE MAGNETO.
(1) Turn the engine crankshaft in the normal direction of rotation until the No. 1 cylinder is in the
full-advance firing position.
(2) Remove the harness cap from the magneto. Before doing this, place an index mark on the
harness cap and distributor housing to ensure proper alignment upon reassembly.
(3) Disconnect the P-lead and pressurization tube from magneto. Disconnect the retard breaker
lead to the starting circuit from the left magneto.
(4) Remove the nuts, washers and clamps, and remove the magnetos from the engine.
(5) Cover the magneto accessory opening with suitable material to prevent internal engine
contamination.
C. 500 Hour Inspection and Cleaning
Each 500 hours, remove magneto per Removal, above, and disassemble magneto, as necessary,
per Disassembly, below. Inspect and clean magneto as follows:
(1) Inspect ball bearing assembly by rotating rotor shaft. Shaft should rotate freely without binding
or sticking, but should not appear loose. If not, replace bearings.
(2) Inspect rotor for damage or worn keyway. Check rotor surfaces for wear.
(a) Inspect oil seal location on shaft.
(b) Assemble bearings and rotor per Assembly, steps (1) & (2), below.