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

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AIRFOILS (Cont.)
E. 100 Hour Inspection (cont.)
(2) Operational Check
Operationally check pneumatic deicing system every 100 hours. The check can be done on the
ground. Before performing operational check, perform a visual inspection to determine condition
of deicer boots. Correct any areas in need of repair prior to operational check.
With engine operating, activate deicing system switch. Observe operation of deicers carefully for
evidence of malfunctioning. Look for tubes which leak or fail to inflate and deflate properly.
F. Electrical Test
With engine OFF, turn airplane battery switch ON.
(1) Timer: Activate deicer system switch. The timer should begin to operate immediately and complete
one full cycle of the system. If the timer does not function:
(a) Reset circuit breaker and recheck.
(b) Check circuit for power source, through circuit breaker, to switch to timer, to ground.
(c) Replace timer.
(2) Pressure Control Valve: The pressure control valve is located in engine compartment. Activate
system switch to ON position. Solenoid valve should be actuated immediately for 6 seconds, as
evidenced by an audible click. If solenoid valve does not function:
(a) Disconnect electrical connector at solenoid. Attach test light or other suitable test equipment
to connector and activate system switch. If test equipment does not indicate complete circuit:
1 Check circuit from timer, to solenoid connector, to ground.
2 Replace timer.
(b) Use ohmmeter to check solenoid for open circuit. If solenoid circuit is open, replace solenoid
valve.
(c) Unscrew solenoid.
– CAUTION –
Do not loosen steel hex actuator pin or valve poppet.
(d) Attach connector to solenoid. Insert hex actuator pin into solenoid. Activate system switch. If
pin is not ejected from solenoid, replace control valve.
G. Testing For Pressure Leaks
(1) Test can be performed in engine compartment.
(2) Cap overboard port of pressure valve.
(3) Connect a source of clean air to pressure valve inlet port. Inlet pressure source must supply a min-
imum of 18 psig to system. By means of a hand operated valve, trap pressure in deicer system.
Observe system for leakage. Leakage rate should not exceed a pressure drop of 3.0 psig per
minute.
(4) Remove test equipment, lubricate all threads, and replace all system components.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
30-10-00
Page 30-10
Reissued: July 1, 1993
2H4