Specifications

CESSNA SECTION 4
MODEL 172R NAV III NORMAL PROCEDURES
GFC 700 AFCS
U.S.
CRUISE (Continued)
LEANING USING EXHAUST GAS TEMPERATURE (EGT)
(Continued)
EXHAUST GAS TEMPERATURE (EGT)
Figure 4-4
Operation at peak EGT provides the best fuel economy. This results in
approximately 4% greater range than shown in this POH 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.
NOTE
• Any change in altitude or power setting will require a
change in the recommended lean mixture setting and a
recheck of the EGT setting.
• The EGT indicators take several seconds, after a mixture
adjustment, to start to show EGT changes. Finding peak
EGT and adjusting the mixture to the applicable setting
should take approximately one minute when the
adjustments are made carefully and accurately.
Adjusting the mixture quickly is not recommended.
(Continued Next Page)
MIXTURE DESCRIPTION
EXHAUST GAS
TEMPERATURE (EGT)
RECOMMENDED LEAN
(Pilot’s Operating Handbook)
50°F Rich of Peak EGT
BEST ECONOMY Peak EGT
172RPHBUS-00 4-37