Textron Cessna 172R User Manual

CESSNA
MODEL
172R
SECTION
3
EMERGENCY
PROCEDURES
EXCESSIVE
FUEL
VAPOR
INDICATIONS
Excessive
fuel
vapor
is
most
likely
to
be
generated
during
ground
operations
when
operating
at
higher
altitudes,
in
unusually
warm
temperatures
or
with
more
volatile
fuel
blends.
Operation
at
or near
idle
RPM
(low
fuel
flow)
for
extended
periods
will
increase
the chances
of
fuel
vapor
generation.
(See
"Leaning
For
Ground
Operations",
Section
4.)
Indicated
fuel
flow
that is
not
stable
(sudden
changes
greater
than
1
gal/hr)
is
a
sign
that
fuel
vapor
may
be
present
in
the
system.
Fuel
flow
indications that
become
less stable
(increasing
changes)
may
lead
to
power
surges
and
power
loss
if
not
corrected.
If
in-flight
vapor
is
suspected,
smoother
engine
operation
may
result
from
making
the
following
changes
(singly
or
together):
set
the
auxiliary
fuel
pump
switch
to
the
ON
position,
lean the
mixture
|
for
smooth
engine
operation
and select another
fuel
tank.
Increasing
the
airspeed
to
provide
more
air
flow
through
the
cowling
will
aid
in
cooling
the
engine
and
fuel
system
components.
LOW OIL
PRESSURE
If
the low oil
pressure
annunciator
(OIL PRESS)
illuminates
and
oil
temperature
remains
normal,
the
oil
pressure
sending
unit
or
relief
valve
may
be
malfunctioning.
Land
at
the
nearest
airport
to
inspect
the
source
of
trouble.
If
a
total loss
of
oil
pressure
is
accompanied
by
a
rise
in
oil
temperature,
there is
good
reason
to
suspect
an
engine
failure
is
imminent. Reduce
engine
power
immediately
and select
a
suitable
forced
landing
field.
Use
only
the
minimum
power
required
to
reach
the desired
touchdown
spot.
Revision
8
3-21
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Textron Cessna 172R Specifications

General

Brand	Textron
Model	Cessna 172R
Category	Aircrafts
Language	English