Control Valves; Deicer System Inspections - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
a.
Removal of Inline Filter (#1J4-6) located aft of the fire wall in both the left and right engine
nacelle.
1.
Remove the appropriate access panel on the upper section of the engine nacelle. (Refer to
Figure 2-3 of Section II.)
2.
Disconnect the hose clamps and remove the appropriate filter from the line connections.
NOTE
These filters are the disposable type and must be replaced by a
new one every 500 hours. Refer to PA-31-350 Parts Catalog for
correct part number.
b.
Installation of Inline Filter (# 1J4-6). The filter has an arrow on the case indicating direction of
air flow, and should be installed in the exact position of the old filter.
1.
Place the new filter in the engine nacelle aft of the fire wall and connect the air lines to the
filter and secure with hose clamps.
2.
Install and secure access panel previously removed.
c.
Removal of Air Filter (#1J1-3) located in lower left and right engine nacelle aft of the firewall
above the air inlet opening.
1.
Remove the appropriate access panel on the outboard sides of the engine nacelle aft of the
fire wall. (Refer to Figure 2-3 of Section II.)
2.
Disconnect the hose clamp and remove the hose from the filter.
3.
Remove the locking nut from the filter line and remove the filter.
NOTE
The filter should be cleaned or replaced as required at each 100
hour inspection. Refer to PA-3 1-350 Parts Catalog for correct part
number.
d.
Installation of Air Filter (#1J1-3).
1.
Place the filter in the same position as it was prior to removal and secure with the locking
nut.
2.
Connect the hose to the filter and secure with hose clamp.
3.
Install and secure access panel previously removed.
14-70. CONTROL VALVES. No service is recommended for these valves except for their replacement in
the event of failure.
14-71. TIMER. No field maintenance is recommended. Refer to Parts Caralog for replacement timer.
14-72. INSPECTIONS. A ground check of the entire deicer system should be made at least every 100
hours. To permit ground checking the system without engine operation, a test plug is designed into all
systems, usually between the pressure check valve and the combination unit.
Before checking the system. all deicers should be inspected for damaged areas and repaired according to
the procedure in this section outlining the cold patch or vulcanized repairs. In order to check the system. refer
to Table XIV-VI and paragraph 14-73 for operating pressures and check procedures.
Revised: 10/5/83
ACCESSORIES AND UTILITIES
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