CESSNA
MODEL 172R
SECTION
7
AIRPLANE
&
SYSTEMS
DESCRIPTION
FUEL INDICATING
Fuel
quantity is
measured by
two float type
fuel
quantity
\
transmitters
(one in each tank)
and
indicated by
an
electrically
operated
fuel
quantity
indicator on
the
left
side of the
instrument
panel. The gauges are marked in gallons of fuel. An
empty
tank
is
indicated
by a red line
and the
number 0.
When an
indicator
shows
an
empty
tank,
approximately
1.5
gallons remain in each
tank
as
/iSP,N'
unusable
fuel.
The indicators should
not
be
relied
upon
for accurate
'
readings
during skids,
slips,
or unusual
attitudes.
Each fuel tank
also incorporates warning circuits
which can
detect low fuel conditions and erroneous transmitter
messages.
Anytime fuel
in
the tank
drops below approximately
5 gallons (and
r
remains below this level for
more than
60 seconds),
the
amber
LOW
FUEL message
will flash
on
the
annunciator panel for
approximately
10
seconds and
then remain steady
amber. The
annunciator
cannot
be turned off by the
pilot.
If the
left
tank is low,
the
message
will read L LOW FUEL. If the right tank is low, the
message will
read
LOW FUEL R. If
both
tanks are
low, the
\
message will
read
L
LOW
FUEL
R.
In
addition
to
low
fuel
annunciation, the warning
circuitry
is
r
designed
to
report failures
with
each transmitter
caused
by
shorts,
opens
or transmitter
resistance which increases over time.
If the
circuitry detects
any
one
of
these conditions, the
fuel
level
indicator
needle
will go
to
the OFF position
(below the 0
mark
on
the fuel
indicator), and the amber annunciator
will
illuminate.
If the
left
tank|
transmitter
has
failed,
the
message will read L
LOW
FUEL
If
the
r
right tank transmitter
has
failed,
the message will read LOW
FUEL
R. If
both tanks transmitters have
failed,
the
message will
read
L
LOW
FUEL
R.
Fuel pressure is
measured
by
use of a
transducer mounted
near
the fuel manifold.
This transducer produces an electrical
signal
which is translated
for
the
cockpit-mounted indicator
in
gallons-per-
hour.
Feb
28/00
7-25
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