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

Page: 708 / 1956

PAGE 2
Feb 28/07 30-60-00
3J20
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
CHART 1 (Sheet 1 of 4)
TROUBLESHOOTING PROPELLER HEAT SYSTEM
Trouble Cause Remedy
Ammeter shows zero current Tripped circuit breaker Locate and correct
both phases of the switch. short before setting
timer cycle. circuit breaker.
No power from airplane. If no voltage into switch,
locate and correct open.
Circuit breaker or switch If no voltage at C/ B output
faulty. with voltage at input and
C/B does not reset, replace
C/B. If voltage is OK at
output, check switch in
same manner. If voltage is
OK at switch output, go to
next step.
Ammeter faulty. (If either Test for voltage up to and
or both deicers heat with out of ammeter. If low
ammeter at zero, replace output and input satis-
the ammeter.) factory, replace ammeter.
If no voltage to ammeter,
locate and fix open
between switch and
ammeter.
Open ammeter to timer. Disconnect harness at
timer and check voltage
at Pin B (of harness) to
ground. If none, locate
and correct open.
Ammeter shows normal Open in wiring between Use heat test to find
current part of cycle, timer and brush block deicers not heating and
zero current rest of cycle. assembly. test for voltage on that
contact of wire harness
plug. (At brush block
assembly.) If zero after
one minute, locate and
fix open in wiring from
timer to wire harness
plug.
Open between brush If there is voltage to brush
block assembly and block wire harness plug,
deicer lead straps. try voltage at junction to
deicer lead and slip ring
lead. If no voltage, find and
correct open in wiring
within brush block or in
contact of brush to slip
ring.