PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 1
Nov 30/06
2C9
21-20-00
DISTRIBUTION
1. Overhead Vent System (S/N’s 2842109 and up (2001 and up))
The overhead vent system ( see 21-40-00, Figure 1) provides cabin ventilation and cooling.
A. Ram Air Installation (Standard)
Air enters an inlet located on the rear left side of the fuselage and is ducted through the overhead
vents to the cabin. Fresh air flow is controlled by a flapper valve positioned in the duct aft of the rear
close-out panel. A CABIN AIR knob (pull off), located in the cockpit overhead, controls the flapper
valve.
B. Overhead Vent Blower (Optional)
An optional two-speed blower will force air through the overhead vent system whenever desired. It is
mounted aft of the close-out panel underneath the top of the fuselage and is connected to the
overhead vent system. The vent blower draws air in from the left rear side of the fuselage and forces
it through the ducting. A three position blower switch on the instrument panel controls the two speed
blower.
(1) Removal
(a) Remove the access door from the aft wall of the baggage area.
(b) With the master switch off, disconnect the plug assemblies at the blower assembly.
(c) Remove the inlet and outlet hoses from the blower assembly by removing the clamps.
(d) Remove the screws, washers and nuts that secure the blower assembly to the hanger
braces.
(e) Remove the screws and washers which secure the blower assembly to the retainer and
hangers.
(f) Remove the blower assembly from the aircraft.
(2) Disassembly
(a) Remove the hose duct from the forward edge of the blower assembly by removing the
nuts, washers and screws.
(b) Remove the cover from the blower assembly by removing the nuts, washers and screws.
(c) Remove the blower fan from the motor shaft by removing the set screw.
(d) For removal of the motor, proceed as follows:
1 Separate the plate from the motor cover by carefully drilling out the connecting rivets.
2 Cut the motor wires at the edge of the receptacle and plug and remove the wire ends
from the blocks.
3
Remove the motor from the mounting plate by removing the nuts, washers and bolts.
(3) Assembly
(a) Mount motor on plate and secure with bolts, washers, and nuts. Check that motor nuts are
snug and shaft spins freely.
(b) Position cover over motor plate with motor wires protruding through cover grommet.
(c) With holes in cover matching holes in motor plate, secure the two parts together with
rivets.
(d) Fill any opening left where wires are pass through cover grommet with Sealant, Airframe
and Window (see 91-10-00, List of Consumables).
(e) Install wires in plug and receptacle.
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