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Each nozzle can adjust to point the airflow as necessary. Turning the nozzle flap controls the
amount of air flowing into the cockpit.
C. Equipment Cooling
Ram air from the right NACA duct cools the equipment. Warm air escapes through holes in the
instrument panel cover.
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TROUBLE-SHOOTING
1. General
This table tells you how to trouble-shoot the air conditioning system. If you find the trouble in
column 1, do the repair in column 3.
Complaint Possible Cause Remedy
Burning smell in the cockpit. Exhaust heat-exchanger
cracked.
Replace or repair the heatexchanger
Heating system supplies warm
air when set to OFF.
Control cable out of adjustment. Adjust the heat valve control
cable.
Heating system cannot be
selected to the windscreen/floor.
Control cable out of adjustment. Adjust the distribution box
control cable.
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MAINTENANCE PRACTICES
1. General
This Section tells you about the Maintenance Practices for the distribution and heating systems. It
tells you how to remove/install and adjust components.
2. Remove/Install the Heat Control Valve
A. Remove the Heat Control Valve
Detail Steps/Work Items Key Items
1. Remove the engine cowlings. Refer to Chapter 71-10
WARNING: IF THE ENGINE HAS BEEN RUNNING, TAKE CARE WHEN YOU
TOUCH THE HEAT CONTROL VALVE. THE HEAT CONTROL VALVE
GETS HOT.
2. Release the worm drive clamp which holds
the flexible hose to the heat control valve.
Then disconnect the hose from the valve.
3. Set the HEAT control lever to ON. Loosen
the screw which holds the bowden cable to
the lever in the heat control valve.
− Move the bowden cable clear.
4. Remove 4 bolts and washers which attach
the heat control valve to the firewall.
5. Remove the heat control valve from the
firewall.
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B. Install the Heat Control Valve
Detail Steps/Work Items Key Items
1. Put the heat control valve in position on the
firewall.
Use Product PR 812,
(MIL-S-38249 Type 1) Fire Wall Sealant.
2. Install the washers and bolts which attach the
valve to the firewall.
3. Set the cockpit control lever to OFF. Then
move it forward about 3mm (0.1in).
4. Put the bowden cable in position on the heat
control valve. Adjust the nuts on the outer
sheath adjuster to a mid position.
Make sure that the inner cable is through the
end fitting on the flap lever of the heat control
valve.
5. Set the flap in the heat control valve to fully
close the hole in the firewall.
6. Tighten the screw in the end fitting on the
flap lever to hold the inner cable.
7. Do a test for correct operation of the heat
control valve.
8. Connect the flexible hose to the heat control
valve. Tighten the worm drive clamp.
9. Install the engine cowlings. Refer to Chapter 71-10
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3. Test/Adjust the Heat Control Valve
Detail Steps/Work Items Key Items
1. Remove the engine cowlings. Refer to Chapter 71-10
2. Set the CABIN HEAT control lever in the
cockpit to OFF.
There must be ‘bounce’ of about 3mm (0.1in)
between the back of the lever and the cockpit
stop.
WARNING: IF THE ENGINE HAS BEEN RUNNING, TAKE CARE WHEN YOU
TOUCH THE HEAT CONTROL VALVE. THE HEAT CONTROL VALVE
GETS HOT.
3. Make sure that:
− The flap fully closes the opening to the
distribution box.
Look or feel inside the heat control valve.
4. If necessary, adjust the outer sheath of the
cable that goes through the distribution box
to give the correct ‘bounce’.
5. Set the CABIN HEAT control lever in the
cockpit to ON (fully forward).
6. Make sure that:
− The flap fully closes the outlet to the
engine compartment.
Look or feel inside the heat control valve.
CAUTION: MAKE SURE THAT THE FLAP ON THE HEAT CONTROL VALVE
FULLY CLOSES THE FIREWALL OUTLET WHEN YOU SET THE
CABIN HEAT CONTROL LEVER TO OFF. THIS IS TO STOP FIRE OR
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