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EXHAUST FUMES FROM GOING INTO THE COCKPIT IN AN
EMERGENCY.
7. Install the engine cowlings. Refer to Chapter 71-10
Heating and Ventilation
DA20-C1 AMM
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19 Dec 1997 21-00-00 Doc # DA 201-C1
Rev. 0
4. Remove/Install The Distribution Box
A. Remove The Distribution Box
Detail Steps/Work Items Key Items
WARNING: DO NOT STAND WITHIN THE DANGER AREA OF THE PROPELLER.
IF THE ENGINE STARTS, THE PROPELLER CAN CAUSE DEATH OR
INJURY TO PERSONS.
WARNING: YOU MUST MAKE SURE THAT THE ENGINE IS SAFE BEFORE YOU
DO WORK ON THE CABIN HEAT SYSTEM. DISCONNECT THE
SPARK PLUG LEADS. MAKE SURE THAT :
- THE IGNITION SWITCH IS IN THE “OFF” POSITION.
- THE “P” LEADS ARE GROUNDED.
- THE THROTTLE IS SET TO “IDLE”.
-THE MIXTURE CONTROL IS SET TO “LEAN CUT-OFF”.
WARNING: IF THE ENGINE HAS BEEN RUNNING, TAKE CARE WHEN YOU
TOUCH THE HEAT CONTROL VALVE AND THE DISTRIBUTION BOX.
THE HEAT CONTROL VALVE AND THE DISTRIBUTION BOX GETS
HOT.
1. Disconnect the airplane battery. Refer to Chapter 24-31
2. Remove the engine cowlings. Refer to Chapter 71-10
3. Make the engine safe:
− Make sure that the ignition switch is set
to “OFF” position.
− Make sure the “P” leads are grounded.
− Set the throttle to IDLE.
− Mixture control set to LEAN CUT-OFF.
− Disconnect the spark plug leads.
4. Remove the heat control valve. Refer to the Remove The Heat Control Valve
procedure.
DA20-C1 AMM
Heating and Ventilation
Doc # DA 201-C1
Rev. 0 21-00-00 Page 205
19 Dec 1997
Detail Steps/Work Items Key Items
5. Remove the control knobs from these levers
at the center console:
− PARKING BRAKE.
− HEAT control ON OFF.
− HEAT distribution DEFROST FLOOR.
− ALTERNATE AIR.
− FUEL MIXTURE.
6. Remove the engine controls face plate from
the center console cover.
− Remove the four screws.
7. Disconnect and remove the TRIM switch
from the face plate.
Disconnect the connector below the face
plate. Lever the TRIM switch clear.
8. Remove the center console cover from the
center console:
− Remove the six screws from the two
sides of the center console cover.
9. Disconnect the cable wire end of the HEAT
DEFROST-FLOOR control from the lever at
the control quadrant.
− Loosen the swivel attachment.
10. Disconnect the outer sheath of the HEAT
DEFROST-FLOOR control bowden cable
from the tab at the control quadrant.
− Remove the two nuts.
11. Disconnect the cable wire end of the HEAT
ON-OFF control from the lever at the control
quadrant.
− Loosen the swivel attachment.
12. Disconnect the outer sheath of HEAT ONOFF
control bowden cable from the tab at the
control quadrant.
− Remove the two nuts.
13. Remove the distribution box installation
screws from the center console at the left and
right footwells.
Heating and Ventilation
DA20-C1 AMM
Page 206
19 Dec 1997 21-00-00 Doc # DA 201-C1
Rev. 0
Detail Steps/Work Items Key Items
14. Remove the support block from the
distribution box:
− Remove the nut from the heat valve
bowden cable at the support block.
− Turn the bowden cable outer sheath and
remove from the support block.
− Remove the two screws that attach the
support block to the distribution box.
15. Carefully pull the distribution box forward into
the engine compartment.
− Remove the two hot air distribution
hoses.
Sufficient to get access to the hot air
distribution hoses at the rear of the
distribution box.
16. Remove the distribution box.
B. Install The Distribution Box
Detail Steps/Work Items Key Items
1. Install the HEAT DEFROST-FLOOR bowden
control cable to the distribution box before
you install it in the center console.
2. Install the two hot air distribution pipes to the
rear of the distribution box before you install it
in the center console.
− Tighten the worm-drive clamps.
3. Carefully put the HEAT DEFROST-FLOOR
bowden control cable in position in the center
console. Then put the distribution box in
position in the center console.
From the engine compartment.
4. Put the HEAT ON-OFF bowden control cable
in position.
− From the control quadrant into the hole at
the top of the distribution box.
5. Turn the HEAT ON-OFF bowden control
cable and install to the support block.
　
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