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procedure.
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Detail Steps/Work Items Key Items
Note: Only do items 14 thru 21 if you had to do items 3 thru 7.
14. Do a check for loose items in the cockpit. Look specially in the area of the control
quadrant.
15. Install the center console cover to the center
console:
16. Install the TRIM switch to the face plate. Push the Trim switch into position in the face
plate. Connect the connector below the face
plate.
17. Install the engine controls face plate to the
center console cover.
18. Install the control lever knobs to these items:
− PARKING BRAKE.
− HEAT control ON OFF.
− HEAT distribution DEFROST FLOOR.
− ALTERNATE AIR.
− FUEL MIXTURE.
19. Do a controls freedom of movement check.
20. Connect the airplane battery. Refer to Chapter 24-31.
21. Do an operational check of the elevator trim
control system.
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6. Remove/Install the Heat Exchanger Shroud
A. Remove the Heat Exchanger Shroud
Detail Steps/Work Items Key Items
1. Remove the engine cowlings Chapter 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 worm drive clamps which attach
the inlet and outlet hoses to the heat
exchanger.
Refer to Figure 2
3. Disconnect the inlet and outlet hoses from
the heat exchanger.
4. Release the screws which hold the shroud to
the muffler.
5. Remove the shroud from the muffler.
B. Install the Heat Exchanger Shroud
Detail Steps/Work Items Key Items
1. Put the shroud in position on the muffler with
the joint at the top.
Refer to Figure 2
The inlet connection points forward on the
right. The outlet connection points down and
aft on the left.
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 worm drive clamps which hold
the hoses.
5. Install the engine cowlings Chapter 71-10
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Figure 2: Heat Exchanger Installation On The Exhaust Muffler
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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
Detail Steps/Work Items Key Items
1. Remove the heat-exchanger shroud. Refer to the Heat Exchanger Shroud
Removal procedure.
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 it for repair or
replace it.
3. Examine the outer face of the exhaust
muffler. Look specially for soot marks and
cracks.
Use a magnifying glass and a strong light. If
you find soot marks or cracks, you must
remove the muffler for repair or replace it.
4. Install the heat exchanger shroud. Refer to the Heat Exchanger Shroud Install
procedure.
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DA20-C1 AMM
Communications
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CHAPTER 23
COMMUNICATIONS
Communications
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DA20-C1 AMM
Communications
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Rev. 15 23-CONTENTS Page 1
30 Apr 2009
TABLE OF CONTENTS
CHAPTER 23-00 COMMUNICATIONS - GENERAL................................................................................1
1. General.......................................................................................................................1
2. Description..................................................................................................................1
CHAPTER 23-10 SPEECH COMMUNICATION.......................................................................................1
1. General.......................................................................................................................1
2. Description..................................................................................................................3
　
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