Textron Cessna 172R User Manual

CESSNA
MODEL
172R
SECTION
4
NORMAL
PROCEDURES
FUEL
VAPOR
PROCEDURES
The
engine
fuel
system
can
become
susceptible
to
fuel
vapor
formation
on
the
ground
during
warm
weather. This
will
generally
occur
when the
outside ambient
air
temperature
is above
80°F.|
The situation
is
further
aggravated by
the
fact
that the
engine
fuel
flows
are
lower
at
idle
and taxi
engine
speeds.
When
vapor
occurs
as
evidenced
by
idle
engine
speed
and
fuel flow
fluctuations,
the
following
procedures
are
recommended.
1
.
With the mixture
full
rich,
set
the
throttle
at
1
800
RPM
to
2000
RPM.
Maintain this
power
setting
for
1
to
2
minutes
or
until
smooth
engine
operation
returns.
2.
Retard the
throttle
to
idle
to
verify
normal
engine
operation.
3.
Advance
the
throttle
to
1200
RPM
and lean the mixture
as
described under
FUEL
SAVINGS PROCEDURES
FOR
FLIGHT
TRAINING
OPERATIONS.
4.
Just
prior
to
TAKEOFF,
apply
full
throttle,
for
approximately
10
seconds
to
verify
smooth
engine
operation
for
takeoff.
NOTE
When
the
engine
is
operated
above
1800
RPM,
the
resulting
increased
fuel
flow
also
makes
for
lower
fuel
temperatures
throughout
the
engine
fuel
system.
This
increased
flow
purges
the
fuel
vapor
and
the cooler
fuel
minimizes
vapor
formation.
In
addition
to
the above
procedures,
the
sections below
should
be
reviewed and
where
applicable,
adhered
to:
Section
2
--
Section
3
--
Section
4
--
Section
7
--
Take
note
of
the
placard
on
"When
Switching
From
Dry
Tank".
Take
note
of
the
excessive
fuel
vapor
procedures
in
both the
checklist
and
the
amplified
procedures
sections.
Take
note
of
the
hot
weather
operational
notes
and
procedures
in
both the
checklist
and
the
amplified
procedures
sections.
Take
note
of
the altitude
operational
procedures
and
the
section
on
auxiliary
fuel
pump
operation.
4-29
Revision
7
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Textron Cessna 172R Specifications

General

Brand	Textron
Model	Cessna 172R
Category	Aircrafts
Language	English