Textron Lycoming IO-540 Series User Manual

TEXTRON
LYCOMING
OPERATOR'S
MANUAL
0-540
& 10-540
SERIES
SECTION
3
During
let-down
flight
operations
it
may be
necessary
to manually
lean
carbureted
or fuel
injected
engines
to obtain
smooth
operation.
A. LEANING
TO EXHAUST
GAS
TEMPERATURE
GAGE.
a. Normally
aspirated
engines
with
fuel
injectors
or
carburetors.
(1)
Maximum
Power
Cruise
(approximately
75%
power)
-
Never
lean
beyond
150°F.
on
rich
side
of peak
EGT
unless
aircraft
operator's
manual
shows
otherwise.
Monitor
cylinder
head
temperatures.
(2) Best
Economy
Cruise
(approximately
75%
power
and below)
-
Operate
at
peak
EGT.
B. LEANING
TO
FLOWMETER.
Lean
to applicable
fuel-flow
tables
or lean
to indicator
marked
for cor-
rect
fuel-flow
for each
power
setting.
C. LEANING
WITH
MANUAL
MIXTURE
CONTROL
(Without
flowmeter
or EGT
gage).
a.
Carbureted
Engines.
(1)
Slowly
move
mixture
control
from
"Full
Rich"
position
toward
lean position.
(2) Continue
leaning
until
engine
roughness
is noted.
(3)
Enrich
until
engine
runs
smoothly
and
power
is regained.
8.
USE
OF
CARBURETOR
HEAT
CONTROL
-
Under
certain
moist
atmospheric
conditions
at temperature
of 200
to
900,
it is possible
for
ice
to
form
in the
induction
system,
even
in summer
weather.
This
is due
to
the
high
air velocity
through
the carburetor
venturi
and
the
absorption
of
heat
from this
air
by vaporization
of
the fuel.
The
temperature
in the
mix-
ture
chamber
may
drop
as
much
as 70°F.
below
the
temperature
of
the
incoming
air. If
this air
contains
a
large
amount
of moisture,
the
cooling
process
can
cause
precipitation
in
the
form
of ice.
Ice
formation
generally
begins
in the
vicinity
of
the butterfly
and
may
build up
to such
an
extent
that
a drop
in power
output
could
result.
A loss
of
power
is
reflected
by
a drop
in
manifold
pressure
in
installations
equipped
with
constant
speed
propellers
and
a
drop
in manifold
pressure
and
RPM
in installations
equip-
ped
with
fixed
pitch
propellers.
If
not corrected,
this condition
may
cause
complete
engine
stoppage.
3-7

Textron Lycoming IO-540 Series Specifications

General

Brand	Textron
Model	Lycoming IO-540 Series
Category	Engine
Language	English