Textron 172R180HP, Pilot Operating Handbook

Page: 118 / 396

SECTION 4
NORMAL PROCEDURES
75%POWER
ALTITUDE
KTAS NMPG
Sea Level 114 11.2
4000 feet
119 11.7
8000 feet 124
12.2
Standard Conditions, Zero Wind
CESSNA
MODEL 172R (180 HP)
65% POWER
55% POWER
KTAS NMPG KTAS NMPG
108 12.0 101 12.8
112 12.4 104 13.2
117 12.9 107 13.6
Figure 4-3. Cruise Performance Table
ILEANING WITH AN EGT INDICATOR
The exhaust gas temperature (EGT) may be used as an aid for
mixture leaning in cruising flight at 75% power or less. To adjust the
mixture, using this indicator, lean to establish the peak EGT as a
reference point, enrichen the mixture by the desired increment
based on Figure 4-4, EGT Table.
MIXTURE DESCRIPTION
EXHAUST GAS
TEMPERATURE
RECOMMENDED LEAN 50
°
Rich of Peak EGT
(Pilot's Operating Handbook )
BEST ECONOMY
Peak EGT
Figure
4-4.
EGT Table
As noted in this table, operation 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. Any change in altitude or throttle position will require
a recheck of EGT indication.
4-26 Oct 4/01
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