Cessna Economy Mixture Indicator (Egt). 4-T7 - Cessna Skyhawk 172N 1980 Information Manual

MIXTURE
DESCRIPTION
EXHAUST
GAS
TE MPE RATU
R E
RECOMMENDED LEAN
(Pilot's
Operating Handbook
and
Power Computer)
o
50 F
Rich
of
Peak EGT
BEST ECONOMY Peak EGT
Figure 4-4.
EGT Table
LEANING WITH
A
CESSNA ECONOMY MIXTURE INDICATOR
(EGT)
Exhaust gas temperature (EGT) as shown on the optional
Cessna
Economy Mixture Indicator may
be
used as an aid
for mixture leaning in
cruising
flight
at
75Vo
power or
less. To adjust the mixture' using this
indicator, Iean to establish the peak EGT
as a
reference point
and then
enrichen the mixture by the desired increment based on
figure
4-4.
As noted in this table, operation at
peak
EGT provides
the best
fuel
economy.
This results in approximately
47o
greater
range
than
shorvn
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.
STALLS
The
stalt
characteristics are conventional and aural warning
is
provided by a stall warning horn which
sounds between 5
and
10
knots
above the
stall in all configurations.
Power-off
stall
speeds
at maximum weight for both forward
and
aft
C.G.
positions
are presented
in
Section
5.
CESSNA
MODEL
172N
SPINS
Intentional spins
are
approved in this
1
JuIy
1979
SECTION
4
NORMAL
PROCEDURES
airplane within certain restrict-
4-17