Doc # 6.02.01 Page 207
Rev. 4 09 Jan 2003

21-00-00
AMM

DA 40 Series

(4)  Set the distribution control lever in the cockpit to ..  There should be 'bounce' of about 3 mm (0.1 in) between the back of the lever and the cockpit stop. 
(5)  Make sure that the flap is hard against the top of the of the distributor valve.  Reach through the outlet hole for the pilots' footwells in the floor panel. 
(6)  If the valve is not correctly adjusted, do the following items. 
(7)  Remove the heat valve.  Refer to Paragraph 2. 
(8)  Adjust the control cable in the swivel fitting to give the correct bounce: S Set the distribution control lever close to .. S Loosen the screw in the swivel fitting. S Move the flap a small distance. S Tighten the screw in the swivel fitting.  Access through the front of the valve. If there was no bounce in the . position, then move the flap down. If there was too much bounce in the . position, then move the flap up. 
(9)  Set the distribution control lever in the cockpit to ..  There must be 'bounce' of about 3 mm (0.1 in) between the back of the lever and the cockpit stop. 
Note: If you cannot get bounce at both ends of the range of movement, adjust the cable to give bounce at the . (defrost) end. 
(10)  Do items 8 and 9 as necessary to get the correct adjustment. 
(11)  Install the heat valve. 

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Air Conditioning
AMM

6. Remove/Install the Heat Exchanger Shroud
A. Remove the Heat Exchanger Shroud
Detail Steps/Work Items  Key Items/References 
(1)  Remove the engine cowlings.  Refer to Section 71-10. 
WARNING: IF THE ENGINE HAS BEEN RUNNING, TAKE CARE WHEN YOU TOUCH THE HEAT EXCHANGER. THE HEAT EXCHANGER GETS HOT. 
(2)  Release the 2 worm drive clamps which attach the inlet and outlet hoses to the heat exchanger. Disconnect the hoses.  Refer to Figure 4. 
(3)  Release the screws which hold the flanges of the shroud together and remove the shroud from the muffler. 

B. Install the Heat Exchanger Shroud
Detail Steps/Work Items  Key Items/References 
(1)  Put the shroud in position on the muffler with the flanged joint at the top back.  Refer to Figure 4. The inlet connection points forward on the right. The outlet connection points aft near the middle at the back. 
(2)  Install the screws which hold the flanges of the shroud together. 
(3)  Connect the inlet and outlet hoses to the heat exchanger. 
(4)  Tighten the 2 worm-drive-clamps which hold the hoses. 
(5)  Install the engine cowlings.  Refer to Section 71-10. 

Doc # 6.02.01 Page 209
Rev. 4 09 Jan 2003

21-00-00
AMM

Hot Air Outlet
Bolted Joint for Heat Exchanger Shroud
Figure 4: Heat Exchanger Installation and Inspection
Page 210 Doc # 6.02.01 09 Jan 2003 Rev. 4
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Air Conditioning
AMM

7. Inspect the Heat Exchanger
WARNING:  NO CRACKS ARE PERMITTED IN THE EXHAUST MUFFLER. CRACKS ALLOW CARBON MONOXIDE TO ENTER THE HEATING SYSTEM. CARBON MONOXIDE IS POISONOUS. 
A. Equipment 

Item  Quantity  Part Number 
Magnifying glass.  1  Commercial 

B. Inspection Procedure
Detail Steps/Work Items  Key Items/References 
WARNING: IF THE ENGINE HAS BEEN RUNNING, TAKE CARE WHEN YOU TOUCH THE HEAT EXCHANGER. THE HEAT EXCHANGER GETS HOT. 
(1)  Remove the heat-exchanger shroud.  Refer to Paragraph 6. 
(2)  Examine the inside of the shroud. Look specially for soot marks and cracks.  If you find soot marks, the exhaust muffler is cracked. You must remove the muffler for repair, or replace it. 
　
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