Cessna SkyHawk SP 172S NAV III 2005 Pilot Operating Handbook page 143

SECTION 4
NORMAL PROCEDURES
CESSNA
MODEL 172S NAV III
CRUISE
(Continued)
LEANING USING EXHAUST GAS TEMPERATURE (EGT)
(Continued)
EGTTABLE
MIXTURE DESCRIPTION
EXHAUST GAS
TEMPERATURE
RECOMMENDED LEAN 50
0
Rich of Peak EGT
(Pilot's Operating Handbook)
BEST ECONOMY Peak EGT
Figure 4-4
IOperation at peak EGT provides the best fuel economy. This results
in approximately
4%
greater range than shown in this handbook
accompanied by approximately a 3 knot decrease in speed.
Under some conditions, engine roughness may occur while
operating at peak EGT. In this case, operate at the Recommended
Lean mixture.
J
NOTE
• Any change in altitude or power setting will require
a change in the recommended lean mixture setting
1
and a recheck of the EGT setting.
• The EGT indicators take several seconds, after a
mixture adjustment, to start to show exhaust gas
cha.nges. Findhin g peal'k bE,GT
a Justlng t e mixture to t e app Ica e setting
1
should take approximately one minute when the
adjustments are made carefully and accurately.
Adjusting the mixture quickly is not recommended.
(Continued Next Page)
14-36
U.S.
172SPHAUS-03