Pneumatic Deice System Troubles; Deicers Do Not Inflate; Deicers Inflate Slowly; Deicers Deflate Slowly - Piper PA-44-180 SEMINOLE Maintenance Manual

CHART 3001. TROUBLESHOOTING (PNEUMATIC DEICE SYSTEM)
Trouble

Deicers do not inflate.

Both engines operating
at minimum cruise RPM
or either engine at
2575 RPM.

Deicers inflate slowly

(inflation time - 6
seconds).

Deicers DEFLATE slowly.

PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Cause
Open circuit breaker.
System connection loose
or wire broken.
Timer not functioning.
Control valves not
functioning.
Lines blocked or not
connected.
Lines partially blocked
or not connected securely.
Deflate valve not
functioning properly.
System pressure not
being reached.
Deicer puncture.
Lines partially blocked.
Deflate valve not functioning
properly.
2D7
Remedy
Push circuit breaker
to reset.
Tighten or repair as
required.
Test or replace as
required .
Make electrical test.
Check for sticking
poppet. Clean. Insure
that both vent ports on
solenoid are open.
Blow out lines and
inspect connections.
Make air leakage test.
Blow out lines and
inspect connections.
Make air leakage test.
Insure that both vent
ports on solenoid are
open.
Check performance to
manufacturers specifications.
Repair per specification
or replace.
Inspect and blow out
lines.
Insure that both vent
ports on solenoid are
open.
Revised: May 15, 1989
3 0 - 11 - 0 0
Page 30-03