Piper PA-32R-301T SARATOGA S, Maintenance Manual

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PROPELLER DEICING SYTEM (Cont.)
C. Troubleshooting (Cont.)
Chart 4.
Troubleshooting Propeller Deicer System
(Sheet 1 of 4)
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
30-60-00
Page 30-28
Reissued: July 1, 1993
2H22
Trouble Cause Remedy
Ammeter shows zero current. Tripped circuit breaker switch. Locate and correct short before
(Both phases of the cycle.) setting circuit breaker.
No power from airplane. If no voltage into switch, locate
and correct open.
Circuit breaker switch faulty. If no voltage at switch output
with voltage at switch input,
replace the switch . If voltage is
satisfactory at switch output, go
to next step.
Ammeter faulty. (If some or all Test for voltage up to and out of
deicers heat with ammeter at ammeter. If low or zero output
zero, replace the ammeter.) and input satisfactory, 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 current Open in wiring between timer Use heat test to find deicers not
part of cycle, zero current rest of and brush block assembly. heating and test for voltage on
cycle. that contact of wire harness
plug. (At brush block assembly.)
If zero over 2 minutes, locate
and fix open in wiring from
timer to wire harness plug.
Open between brush block If there is voltage to brush block
assembly and deicer lead straps. wire harness plug, try voltage at
junction of deicer lead and slip
ring lead. If no voltage, find and
correct open in wiring within
brush block or no contact of
brush to slip ring.