Beechcraft Duchess 76 - Page 95

BEECHCRAFT
Duchess 76
Section IV
Normal Procedures
LEANING MIXTURE USING THE EXHAUST GAS
TEMPERATURE INDICATOR (EGT)
For level flight at 75% power
or less, the EGT unit should be
used in the following manner:
1. Lean the mixture and note the point
on the indicator at
which the temperature peaks and starts to fall.
a. CRUISE (LEAN) MIXTURE - Enrich mixture (push
mixture control forward) until EGT indicator shows
a drop of
2SoF to SO°F on rich side of peak.
b. BEST POWER MIXTURE - Enrich mixture (push
mixture control forward) until EGT indicator shows
a drop of
7SoF to 100°F on rich side of peak.
CAUTION
Do not continue to lean mixture beyond the
point necessary to establish peak temperature.
Continuous operation is recommended at
2SoF
or below peak EGT only on rich side of peak.
2. Changes in altitude and power setting require EGT to
be rechecked and mixture reset.
3. A mixture resulting in an EGT 2SoF on the rich side of
peak should also result in fuel flow and TAS values
approximately equal to those presented in the Cruise
Power Settings tables in the PERFORMANCE Section.
If not, the values derived from the Range, Endurance,
and Cruise Speeds charts must be revised accordingly.
In very cold weather, EGT's 2SoF rich of peak may not
be obtainable.
September, 1983
4-13