Fuel Savings Procedures For Flight Training Operations - Cessna 172S NAV III Pilot Operating Handbook

CESSNA
MODEL 172S NAV III
SECTION 4
NORMAL PROCEDURES
CRUISE
(Continued)
FUEL SAVINGS PROCEDURES FOR FLIGHT TRAINING
OPERATIONS
For best fuel economy during flight training operations, the following
procedures are recommended.
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1. After engine start and for all ground operations, set the
throttle to 1200 RPM and lean the mixture for maximum
RPM. After leaning, set the throttle to the appropriate RPMI
for ground operations. Leave the mixture at this setting until
beginning the BEFORE TAKEOFF checklist. After the
BEFORE TAKEOFF checklist is complete re-lean the
mixture as described above until ready for the TAKEOFF
checklist.
2. Lean the mixture for maximum RPM during full throttle
climbs above 3000 feet. The mixture may remain leaned
(maximum RPM at full throttle) for practicing maneuvers
such as stalls and slow flight.
3. Lean the mixture for maximum RPM during all operations at
any altitude, including those below 3000 feet, when using
75% or less power.
NOTE
• When cruising or maneuvering at 75% or less
power, the mixture may be further leaned until the
EGT indicator peaks and is then enrichened 50°F.
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This is especially applicable to cross-country
training flights, but should be practiced during
transition flight to and from the practice area as
well.
• Using the above recommended procedures can
provide fuel savings in excess of 5% when
compared to typical training operations at full rich
mixture. In addition, the above procedures will
minimize spark plug fouling since the reduction in
fuel consumption results in a proportional reduction
in tetraethyllead passing through the engine.
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172SPHAUS-03
U.S. 4-37