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Detail Steps/Work Items  Key Items/References 
(1)  Remove the engine cowlings.  Refer to Section 71-11. 
WARNING: IF THE ENGINE HAS BEEN RUNNING, TAKE CARE WHEN YOU TOUCH THE HEAT VALVE. THE HEAT VALVE GETS HOT. 
(2)  Release the worm-drive-clamp which holds the flexible hose to the heat valve and then disconnect the hose from the heat valve.  Refer to Figure 3. 
(3)  Set the CABIN HEAT control lever in the cockpit to ON.  The flap should be hard against the right wall of the valve. 
(4)  Set the CABIN HEAT control lever in the cockpit to OFF.  There should be 'bounce' of about 3 mm (1/8 in) between the back of the lever and the cockpit stop. 
(5)  Make sure that the flap fully closes the outlet to the distributor valve.  Access through the front of the valve. 
(6)  If necessary, adjust the control cable in the swivel fitting to give the correct bounce: S Set the CABIN HEAT control lever to ON. S Loosen the screw in the swivel fitting. S Move the flap a small distance to adjust it. S Tighten the screw in the swivel fitting.  Access through the front of the valve. If there is no bounce, move the flap to the left. If there is too much bounce, move the flap to the right. 
(7)  Set the CABIN HEAT control lever in the cockpit to OFF.  There should be 'bounce' of about 3 mm (1/8 in) between the back of the lever and the cockpit stop. 
(8)  Do items 6 and 7 as necessary to get the correct adjustment. 
(9)  Connect the flexible hose to the heat valve and tighten the worm-drive-clamps. 
(10)  Install the engine cowlings.  Refer to Section 71-11. 

Page 204 Doc # 6.02.01 09 Jan 2003 Rev. 4
21-01-00
Air Conditioning
AMM

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DA 40 Series

Detail Steps/Work Items  Key Items/References 
(1)  Remove the engine cowlings.  Refer to Section 71-11. 
(2)  Disconnect the battery.  Refer to Section 24-34. 
(3)  Remove the instrument panel cover.  Refer to Section 25-10. 
(4)  Remove the pilots' seats.  Refer to Section 25-10. 
(5)  Disconnect the 2 hot air hoses from the passengers' footwells.  Cut the cable binders. 
(6)  Remove the heat valve.  Refer to Paragraph 2. 
(7)  Remove the 2 screws which attach the distributor valve to the side walls of the floor panel.  In the cockpit. 
(8)  Remove the copper seal between the distributor valve and the firewall. 
(9)  Move the valve forward through the firewall.  To give access to the rear of the valve. 
(10)  Remove the bottom locknut from the control cable for the heat valve.  Where the cable outer sheath attaches to the distributor valve. 
(11)  Move the heat valve control cable clear of the distributor valve. 
(12)  Loosen the screw which holds the control cable to the swivel fitting in the distributor valve. 
(13)  Remove the front locknut from the control cable for the distributor valve. 
(14)  Move the control cable clear of the valve. 
(15)  Disconnect the 2 canopy defrost hoses from the valve. 
　
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