Control Valves Replacement; Pneumatic Boots Removal - Piper PA-44-180 SEMINOLE Maintenance Manual

CONTROL VALVES.
After 100 hours of engine operation, the valve poppet and internal lining of the control valve can become
coated with a film of dried oil causing the valve to stick. To determine if valve poppet is sticking, perform
electrical test. If solenoid checks satisfactory, remove valve poppet and clean control valve bore and poppet. To
clean:
1. Remove nacelle hatch cover to gain access to the valve.
2. Remove electrical connector. Unscrew solenoid.
3. Remove valve poppet. It may be necessary to apply slim nose pliers to pin projection to pull poppet from
valve.
4. Thoroughly clean valve bore and poppet with commercial hydrocarbon type solvent.
5. Reassemble valve and solenoid.
TIMER.
No field maintenance is recommended. For repair or replacement, contact your B. F. Goodrich dealer or
distributor.
PNEUMATIC BOOTS.
REMOVAL OF BOOTS.
The removal of deicer boots should be done in a well ventilated area to avoid difficulty from the fumes of the
solvents. Materials required to remove the boots are: Turco 388 dried cement remover, Kelite 21. and a pressure
handle squirt can. Proceed as follows:
1. Starting at one corner of the upper trailing edge of the deicer, apply a minimum amount of solvent to the
seam line while tension is applied to peel back the corner of the deicer.
2. Using a pressure handle squirt can filled with solvent, separate the deicer boot from the surface for a
distance of 4 inches an the way along the upper trailing edge.
3. The area between the deicer and the wing which has now been separated will act as a reservoir for the
solvent, therefore, the deicer can be pulled down towards the leading edge with a uniform tension.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— CAUTION —
DO NOT LOSE STEEL HEX ACTUATOR PIN.
— Note —
Disconnect line fittings from boot fittings
2D13
3 0 - 1 3 - 0 5
Page 30-09
Revised: May 15, 1989