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

Page: 716 / 1956

PAGE 10
Feb 28/07 30-60-00
3K4
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
C. Metal Oxide Varistor (MOV) Module (See Figure 3.) ( S/N’s 4636132 and up. )
The MOV module must be replaced in the event of a lightning strike.
(1) Disconnect electrical leads, noting their relative position to facilitate reconnection. Loosen and
remove screws holding module in position. Remove module.
(2) Position new module, place screws in position, tighten. Connect electrical leads.
D. Slip Ring Assembly
(1) Replacement
Slip ring assemblies that are open or shorted electrically, cracked or damaged structurally, or
which have damaged surfaces beyond the scope of minor repair or clean up, should be
replaced.
(2) Alignment
Excessive slip ring run-out will result in severe arcing between the slip ring and brushes and
will cause rapid brush wear. If the run-out is not corrected, rapid deterioration of the slip ring
and brush contact surfaces will result and lead to eventual failure of the heating system. Check
the slip ring run-out with a dial indicator securely attached to the engine with the pointer resting
on the slip ring. (See Figure 5.) Rotate the propeller slowly noting the run-out indicated on the
gauge. The total run-out must not exceed 0.005 inch ± 0.0025 inch and 0.002 inch in any 4
inch interval of slip ring travel.
NOTE: Some error may be induced in the readings by pushing in or pulling out on the
propeller. Care must be taken to exert a uniform push or pull.
Small amounts of run-out may be corrected by varying the torque on the slip ring mounting
bolts between 40 to 100 inch-pounds to obtain the required flatness.
Suggested Use of Dial Indicator
Figure 5