Textron 172R180HP, Pilot Operating Handbook

Page: 119 / 396

CESSNA
MODEL 172R (180 HP)
SECTION 4
NORMAL PROCEDURES
FUEL SAVINGS PROCEDURES FOR FLIGHT TRAINING
OPERATIONS
For best fuel economy during flight training operations, the
following procedures are recommended.
1. After engine start and for all ground operations, set the throttle
to 1200 RPM and lean the mixture for maximum RPM. Afte
leaning, set the throttle to the appropriate RPM for ground
operations. Leave the mixture at this setting, throttle as
desired, until beginning the BEFORE TAKEOFF checklist. I
prolonged ground operations exist after the BEFORE
TAKEOFF checklist is complete, re-lean the mixture as
described above until ready for TAKE OFF checklist.
2. Lean the mixture for ma)(imum RPM during full throttle climbsl
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.
I
NOTE
When cruising or maneuvering at 75% or less power, the
I
mixture may be further leaned until the EGT indicator
needle peaks and is then enrichened 50
°
F. 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 tetraethyl lead passing through the engine.
Oct 4/01 4-27