Cessna 182 1978 - Troubleshooting - Pitot Tube Heater; Troubleshooting - Vertical Speed Indicator; Vacuum System

MODEL
182
& T182
SERIES
SERVICE
MANUAL
15-21.
TROUBLE
SHOOTING
--
VERTICAL
SPEED
INDICATOR.
NOTE
Refer
to paragraph
15-15
before blowing
out pitot
or
static lines.
TROUBLE
PROBABLE
CAUSE
REMEDY
INSTRUMENT
FAILS
TO
Static
line plugged.
Blow
out lines.
OPERATE.
Static
line broken.
Repair
or
replace damaged
line, tighten
connections.
INCORRECT
INDICATION.
Partially
plugged static
line.
Blow out
lines.
Ruptured diaphragm.
Replace instrument.
Pointer off
zero.
Reset pointer
to zero.
POINTER OSCILLATES.
Partially plugged
static line.
Blow out lines.
Leak in static
line.
Repair
or
replace damaged
lines,
tighten
connections.
Leak
in instrument
case.
Replace instrument.
15-22.
TROUBLE
SHOOTING
-- PITOT
TUBE
HEATER.
NOTE
Refer
to paragraph
15-15
before
blowing
out pitot
or
static
lines.
TROUBLE
PROBABLE
CAUSE
REMEDY
TUBE
DOES
NOT
HEAT
OR
Switch
turned
"OFF."
Turn
switch
"ON."
CLEAR ICE.
Popped
circuit
breaker.
Reset
breaker.
Break
in
wiring.
Repair
wiring.
Heating
element
burned
out.
Replace
element.
15-23.
VACUUM
SYSTEM.
ing system
is utilized.
The reading
of the
suction
gage
indicates
net
difference
in
suction
before
and
15-24.
DESCRIPTION.
A dry
vacuum
system
is
after air
passes
through
a gyro.
This
differential
installed
on the
aircraft.
The
system
utilizes
a
seal-
pressure
will
gradually
decrease
as
the
central
air
ed
bearing,
engine-driven
vacuum
pump.
A discharge
filter
becomes
dirty,
causing
a lower
reading
on
the
tube
is
connected
to the
pump
to
expell
the
air
from
suction
gage.
the
pump overboard.
A
suction relief
valve
is used
to
control
system
pressure
and is
connected
between
NOTE
the
pump inlet
and the instruments.
In the cabin,
the
vacuum
line is
routed
from the
gyro
instruments
to
Excessive
smoking
will
cause
premature
the
relief
valve
at the
firewall.
A
central
air
filter-
filter
clogging.
15-12