DISTRIBUTION.
CABIN VENT SYSTEM.
OVERHEAD VENT BLOWER.
The blower is mounted in the aft section of the fuselage and is connected to the overhead vent system. The blower draws air in from the dorsal fin or through the inlet located on the left side of the aft fuselage, depending on serial number, and forces it through the ducting, whenever desired. The three position blower switch on the instrument panel controls the two speed blower.
REMOVING BLOWER ASSEMBLY.
1.
Remove the access door from the aft wall of the baggage area.
2.
With the master switch off, disconnect the plug assemblies at the blower assembly.
3.
Remove the inlet and outlet hoses from the blower assembly by removing the clamps.
4.
Remove the screws, washers and nuts that secure the blower assembly to the hanger braces.
5.
Remove the screws and washers which secure the blower assembly to the retainer and hangers.
6.
Remove the blower assembly from the aircraft.
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DISMANTLING BLOWER ASSEMBLY.
1.
Remove the hose duct from the forward edge of the blower assembly by removing the nuts, washers and screws.
2.
Remove the cover from the blower assembly by removing the nuts, washers and screws.
3.
Remove the blower fan from the motor shaft by removing the set screw.
4.
For removal of the motor, proceed as follows:
A. Separate the plate from the motor cover by carefully drilling out the connecting rivets.
B. Cut the motor wires at the edge of the receptacle and plug and remove the wire ends from the blocks.
C. Remove the motor from the mounting plate by removing the nuts, washers and bolts.
REBUILDING BLOWER ASSEMBLY.
1.
Mount the motor on the plate and secure it with the bolts, washers and nuts. Be sure that the motor nuts are snug and the shaft spins freely.
2.
Position the cover over the motor plate with the motor wires protruding through the cover grommet.
3.
With the holes in the cover matching the holes in the motor plate, secure the two parts together with rivets.
4.
Apply PRC-5000 sealant to fill any opening left after the wires are brought through the grommets.
5.
Install the wires in the plug and receptacle according to Chart 2102.
6.
Position the blower fin on the motor shaft and secure with a set screw.
7.
Secure the cover to the blower assembly with screws, washers and nuts.
8.
Position the hose duct on the blower assembly and secure it with screws, washers and nuts. The screws must be installed with their heads inside the duct.
9.
After cleaning the surfaces of all old sealant, use white rubber chalk PRC-5000 sealant to seal where the duct attaches to the blower assembly.
INSTALLING BLOWER ASSEMBLY.
1.
Position the blower assembly in the hangers and retainer.
2.
Install the screws, washers and nuts securing the blower assembly to the hanger braces.
3.
Seal all hose joints with Arno No. C-520 gray tape, then install the inlet and outlet hoses securing them with the clamps.
4.
With the master switch off, connect the plug and receptacles at the blower.
5.
Check the blower for the proper operation.
6.
Install the access door to the aft wall of the baggage area and secure with the attaching hardware.
21-20-00 Page 21-12 Revised: February 28, 2002
1H10
CHART 2102. BLOWER SYSTEM WIRE COLOR CODES
MOTOR WIRES AIRCRAFT WIRES
Pin Nos. YY75062 ESB - Universal Elect. Company Aircraft Harness Pin Nos.
Ground Low Speed Plug Plug 2 1 Brown Yellow AC26A Black 2 1 Receptacle Receptacle
Medium Speed High Speed Receptacle Receptacle 2 1 Red Orange White Red 2 1 Plug Plug
HEATING.
HEATER SYSTEM- OPERATIONAL TEST.
1.
Check all fittings and connections for condition and security of mounting, and all ducts free from obstruction.
2.
Disconnect wire (H10A) from the heater terminal No. 2, this will remove electrical power to the fuel valve and pump so the heater will not ignite.
3.
Turn the master switch and “HEATER” switch on and open the air intake valve. Both blowers (combustion air and ventilating air) should operate. Check at heater exhaust and ventilating air outlets to insure airflow.
4.
Momentarily insert a wedge under the leaf of the main gear squat switch. The ventilation blower should stop operating.
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