Section 4 – Normal procedures
Checklists
Page 4 - 23
5.10. DESCENT
Due to position of fuel sensors, during descent fuel gauges in cockpit will indicate a fuel
quantity slightly higher than the real amount. Regaining level flight will immediately re-
store correct indications.
1. Mixture control: slowly full rich
2. Throttle: reduce as required
Shock cooling shortens engine life.
When reducing power, the change in cylinder head temperature should not exceed 50°F
per minute. In order to ensure best practice and avoid potential illumination of ALT FAIL
(due to low propeller speed), the following best practice should be observed:
- Reducing power to maintain a minimum descent speed of 82 KIAS (best glide) and / or
a blade angle to maintain 850 RPM;
- Opening the ALTER AIR command to full open (to avoid ice accretion).
The maximum permissible cylinder head temperature (500 °F) must never be exceeded.
The mixture control lever should always be moved slowly.
Before selecting a higher power setting the mixture control lever should, on each occasion,
be moved slowly to fully RICH.
Care should always be taken that the cylinders do not cool down too quickly. The cooling
rate should not exceed 50 °F per minute.
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