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

Page: 421 / 1956

PAGE 5
Feb 28/07 2H23
24-30-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
Trouble Cause Remedy
CHART 1 (Sheet 4 of 5)
TROUBLESHOOTING (ELECTRICAL SYSTEM)
Field circuit breaker trips. Short circuit in field Disconnect field wiring at
(continued) winding of alternator terminal of alternator.
Turn on master switch.
Reset breaker, and if
breaker fails to retrip, this
isolates short circuit to field
of alternator itself. Check
brush holders for shorting
against frame. If there are
no obvious signs of a
physical short circuit at field
terminal or brush holder,
replace alternator.
NOTE: Intermittent short circuit.
Internal short circuiting of
the field can occur at
various positions of the
rotor, therefore, reconnect
field, reset breaker.
CAUTION: TURN MAGNETO SWITCH TO OFF BEFORE
TURNING PROP.
Pull propeller slowly by
hand turning alternator
rotor through 360° of travel.
Observe circuit breaker for
signs of tripping.
Excessive ammeter fluctuation. Excessive resistance Check all connections and
in field circuit. wire terminals in field circuit
for deterioration such as
loose binding posts, broken
wire strands at terminals,
etc. Tighten all connections
and replace faulty
terminals.