CHART 3004. TROUBLESHOOTING (PROPELLER DEICER SYSTEM) (cont)
Trouble Cause Remedy
Ammeter shows normal Open between brush If there is voltage to brush
current part of cycle, block assembly and block wire harness plug,
zero current rest of deicer lead straps. try voltage at junction to
cycle. (cont.) 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.
No ground circuit, one If voltage is found at
engine. deicer leads, locate and
fix open from deicer to
ground.
Ammeter shows normal Open or high resistance in Disconnect deicer leads
current part of cycle, deicer or slip ring leads. to check resistance. If not
low current rest of OK, replace faulty deicer.
cycle. If satisfactory, locate and
fix open in slip ring leads.
Check deicer wire harness
leads for continuity. Ohmmeter
needle must not
flicker when leads are
stretched or flexed. Replace
as required.
High resistance in circuit Check for contact of brush
with low current. to slip ring. Check wiring
from timer to deicers for
loose or corroded connections
and partially broken
wiring. Correct as required.
Ammeter shows low current Aircraft voltage low. Check voltage into switch.
over entire cycle.
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
3 0 - 6 2 - 0 0
Page 30-24
Revised: May 15, 1989
2E4
PIPER AIRCRAFT
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