Diamond Aircraft DV 20 E 2022, Airplane Maintenance Manual

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AIRCRAFT
Exhaust
DV 20 E AMM
Page 202
15 Mar 2022 78-00-00 Doc # 4.02.25
Rev. 2
3. Inspection of Exhaust System
The inspection can be performed without removal of exhaust system components. To perform this test,
loosen the mounting screws of the hose connection on the heat exchanger and inspect the muffler for
cracks and corrosion.
The weld seams are especially susceptible to cracks through which dangerous carbon monoxide can
enter the cabin.
If there is suspicion of leakage, the cabin should be checked for contamination using a gas-detector
apparatus. The maximum permissible level of carbon monoxide contamination is 50 PPM (parts per
million). In the event that there is no gas-detector apparatus available, the muffler should be closed
off and checked by application of compressed air. The outside surface of the muffler should be coated
with soap solution, which will show bubbles where cracks exist. Small cracks can be repaired by
welding, while in the event that major damage has been found, the muffler should be replaced.
4. Inspection of Heat Exchanger
For inspection instruction, refer to Chapter 21.