Cessna 172SPHUSR05 Pilot Operating Handbook page 126

SECTION 4
NORMAL PROCEDURES
The EGT indicator requires several seconds to
respond to mi x ture adjustments and changes in
exhaust gas temperature. More rapi d changes in
EGT indication are nei t her necessary nor desi r able.
Determining peak EGT and setting the desi r ed
mi x ture shoul d take approximatel y one mi n ute when
the adjustments are made suffi c i e ntl y slowl y and
accu ratel y .
FU E L SAVINGS
OPERATIONS
. For best fuel economy during flight training operations, the
foll o wi n g procedures are recommended.
1 . After engine start and for all ground operati o ns, set the throttle
to 1 200 RPM and lean the mixture for maximum RPM. Leave
the mi x ture at thi s setting until beginning the BEFORE
TAKEOFF checkli s t. After the BEFORE TAKEOFF checkl i s t is
complete re-I e an the mi x ture as descri b ed above until ready
for the TAKEOFF checkli s t.
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2. Lean the mixture for maximum RPM during full throttle climbs
above 3000 feet. The mi x ture may remain leaned (maximum
RPM at full throttl e ) for practi c i n g maneuvers such as stalls
and sl o w flight.
3. Lean the mi x ture for maximum RPM duri n g all operati o ns at
any al t i t ude, including those bel o w 3000 feet, when using
75% or less power.
When crui s i n g or maneuveri n g at 80% or less
power, the mi x ture may be further leaned until the
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EGT indicator needle peaks and i s then
enri c hened 50°F. This i s especi a l l y applicabl e to
cross-country training flights, but should be
practi c ed during transi t i o n flight to and from the
practi c e area as well.
Using the above recommended procedures can
provi d e fuel savi n gs i n excess of 5 0 / 0 when
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compared to typi c al training operati o ns at full ri c h
mi x ture. In addi t i o n, the above procedures will
minimi z e spark plug fouling si n ce the reduction in
fuel consumpti o n resul t s in a proporti o nal reducti o n
in tetraethyl lead passi n g through the engine.
14-28
NOTE
P ROCE D U R ES
NOTE
MODEL 1 72S
FOR FLIGHT
CESSNA
TRAI NING
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Revi s i o n 4