Upon reaching cruise altitude, allow acceleration to
cruise airspeed, then trim the aircraft for level flight,
reduce manifold pressure and
RPM
to desired cruise
power, and close the cowl flaps. The cowl flaps should be
partially opened (control pulled aft
approxilraately three
inches)
if
necessary, to maintain the oil and cylinder
head temperatures within the normal operating range.
When cruising at
7'5
percent power or less, lean the
mixture
after
cruise power
is
established in accor
-
dance with one of the following methods:
A.
Leaning using exhaust gas temperature gage (EGT)
(if installed)
1,
Lean the mixture until temperature peaks on
the
EGT
indicator.
ECONOMY CRUISE
-
Enrich mixture (push
mixture
ver forward) until the
EGT
indicator
-
drops
&A
F
r
more below peak.
i
q
~~-%EST
-,
POWER
M
I
X
T
U
R
E
(\.
..--,,
Best power mixture will result in a
speed increase, an increase
in
fuel
flow and
a
reduction in range.
2.
Changes in altitude and power settings require
the
peak
EGT
to be rechecked and the mixture
re
-
set.
B.
Leaning without exhaust gas temperature gage
(EGT)
1.
Slowly move mixture control lever aft from
"
Full Richqs position toward lean position.
2.
Continue leaning until slight lass of power
is
noted (loss of power
may
or may not be accom
-
panied by roughness).
ISSUED
1%-15-7'7
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