CESSNA SECTION 4
MODEL 172S NAV III NORMAL PROCEDURES
GFC 700 AFCS
U.S.
CRUISE (Continued)
CRUISE PERFORMANCE TABLE
CONDITIONS:
Standard Conditions Zero Wind
Figure 4-3
The Cruise Performance charts in Section 5 provide the pilot with
cruise performance at maximum gross weight. When normal cruise is
performed at reduced weights there is an increase in true airspeed.
During normal cruise at power settings between 55% and 75%, the true
airspeed will increase approximately 1 knot for every 150 pounds below
maximum gross weight. During normal cruise at power settings below
65%, the true airspeed will increase approximately 1 knot for every 125
pounds below maximum gross weight.
The fuel injection system employed on this engine is considered to be
non-icing. In the event that unusual conditions cause the intake air filter
to become clogged or iced over, an alternate intake air door opens
automatically for the most efficient use of either normal or alternate air,
depending on the amount of filter blockage. Due to the lower intake
pressure available through the alternate air door or a partially blocked
filter, engine RPM can decrease from a cruise power setting. This RPM
loss should be recovered by increasing the throttle setting to maintain
desired power.
(Continued Next Page)
ALTITUDE 75% POWER 65% POWER 55% POWER
FEET KTAS NMPG KTAS NMPG KTAS NMPG
Sea Level 114 11.2 108 12.0 101 12.8
4000 119 11.7 112 12.4 104 13.2
8000 124 12.2 117 12.9 107 13.6
172SPHBUS-01
4-35
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