Diamond DA 40, Flight Manual

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DA 40 AFM
Normal Operating
Procedures
Doc. # 6.01.01-E Rev. 8 01-Dec-2010 Page 4A - 31
4A.3.10 MIXTURE ADJUSTMENT
CAUTION
1. The maximum permissible cylinder head temperature
(500 °F (260 °C)) must never be exceeded.
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2. The mixture control lever should always be moved
slowly.
3. Before selecting a higher power setting the mixture
control lever should, on each occasion, be moved
slowly to fully RICH.
4. Care should always be taken that the cylinders do not
cool down too quickly. The cooling rate should not
exceed 50 °F (22.8 °C) per minute.
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Best Economy Mixture
The best economy mixture setting may only be used up to a power setting of 75 %. In
order to obtain the lowest specific fuel consumption at a particular power setting proceed
as follows: Slowly pull the mixture control lever back towards LEAN until the engine starts
to run roughly. Then push the mixture control lever forward just far enough to restore
smooth running. At the same time the exhaust gas temperature (EGT) should reach a
maximum.
The exact value of EGT can be obtained by pressing the far left button on the engine
instrument unit VM 1000. In the Lean mode one bar represents 10 °F (4.6 °C).
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CONTINUED