Cessna 182 1978 - Description; Maintenance Precautions; Oxygen System; Trouble Shooting

MODEL 182 & T182 SERIES SERVICE MANUAL
14-17. OXYGEN SYSTEM. (See figure 14-3.) microphone that is keyed by a switch button on the
pilot's control
wheel. Oxygen valve
outlets are
14-18. DESCRIPTION.
The oxygen system consists
located overhead of each station. Low-pressure
of an oxygen cylinder. pressure gage, regulator
oxygen is provided to each mask
when mask line is
assembly. control assembly, filler valve, pressure connected to an oxygen valve outlet. A gage to mea-
lines.
outlets and oxygen masks with line assemblies,
sure pressure of oxygen in cylinder is
located im-
The pilot's mask
is designed to provide a greater
mediately adjacent to the oxygen valve outlet in
the
flow
of oxygen than the passengers'
oxygen masks.
overhear console.
The control assembly
consists
The masks
are color-coded with
a sleeve adjacent to
of a knob-cable
apparatus which turns
the oxygen
the quick-connect adapter to indicate
altitude ratings. supply off and on.
The control is located in the
The pilot's color code
is red, and the passengers'
overhead
console. The control
is connected to the
color code is orange. The volume
of oxygen is con- cylinder-regulator
assembly by a control cable.
trolled by an orifice in the connector. A built-in The oxygen cylinder is mounted on the aft side of
flow meter provides a visual indication of correct bulkhead station 124. 0. A circular access plate.
oxygen flow. The pilot's mask is equipped with a located on the left-hand side of the fuselage provides
access to the oxygen filler valve assembly.
14-19. TROUBLE SHOOTING - Oxygen System.
TROUBLE
PROBABLE CAUSE
REMEDY
NO
PRESSURE INDICATION
Leak
in capillary
line
Correct
leakage.
ON
PRESSURE GAGE
connection.
(OXYGEN
NOT DEPLETED).
Crimped
or damaged
Replace line.
capillary line.
OXYGEN DURATION
IS
Defective pressure
gage.
Replace gage.
TOO SHORT.
Leak in system.
Locate
and tighten loose fittings.
Replace
defective
part.
PRESSURE
INDICATION
Defective
cylinder
regulator
Replace
cylinder regulator.
NORMAL. BUT NO FLOW
OF OXYGEN
WITH
CYLINDER
Crimped
or
damaged
lines.
Replace
damaged
lines.
REGULATOR ON.
Damaged
control cable.
Replace
control cable.
14-20.
MAINTENANCE
PRECAUTIONS.
b. Cap
all openings
immediately upon
removal of
any component. Do not use tape or caps which will
NOTE
induce moisture.
c. Lines and fittings shall be clean and dry. One
Before
any maintenance is
performed on
of the following
methods may be used
to clean lines.
the
oxygen system,
personnel should
read
and thoroughly understand the fol-
lowing. Careful adherence to these
instructions
will aid
in maintaining
a
Most
air compressors
are oil-lubricated.
trouble-free
oxygen system.
and a small
amount of oil
may be carried
by
the airstream
into the
system.
A
to blow tubing clean only when nitrogen or
Do not
permit smoking
or open flame
argon
are not available.
However.
air
near
aircraft while
maintenance
is
from such a compressor
must
be clean.
being
performed
on the oxygen
system.
dry and filtered..
Assure that all electrical power is dis-
connected
and that the aircraft
is pro-
(1) Wash with
a vapor-degreasing
solution of
perly grounded.
In addition. oils.
stabilized trichloroethylene
conforming to MIL-T-
grease
and solvents may burn
or ex-
7003. followed by
blowing tubing clean
and drying
plode spontaneously
when contacted
by
with
a jet of nitrogen
gas (BB-N-411)
Type 1. Class
1.
oxygen under
pressure.
Grade A or Technical
Argon
(MIL-A-18455).
(2) Flush with naptha conforming to Specification
a. Use
extreme caution
to assure every
port on the
TT-N-95;
then blow clean
and dry with
clean, dry
system is kept
thoroughly clean and free of water, filtered
air. Flush with anti-icing fluid conforming
oil, grease
and solvent contamination.
to MIL-F-5566 or anhydrous
ethyl alcohol.
Rinse
14-11