OXYGEN SYSTEM - SERVICING
1. General
A. The oxygen filler valve is located under the rear seats inside the cabin. A pressure
indicator gauge is located on the instrument panel.
B. Breathing oxygen conforming to MIL-0-27210 Type 1 is to be used for charging cylinders.
C. If the oxygen bottle were thermally discharged, the green burst disc cap must be replaced
and a new discharge indicator installed.
2. Description
A. The standard oxygen system will provide 76 cubic feet of oxygen when charged to 1850
PSIG at 70°F.
3. Precautions
WARNING: OXYGEN SUPPORTS COMBUSTION. MATERIALS THAT WILL NOT
NORMALLY FLASH IN THE ATMOSPHERE WILL READILY BURN OR EXPLODE
IN THE PRESENCE OF CONCENTRATED OXYGEN.
A. Ensure safety precautions are adhered to at all times.
(1) Do not service oxygen bottle while airplane is being fueled.
(2) Ensure no uncontained flammable material is near when servicing oxygen bottle.
(3) Do not direct highly compressed oxygen toward personnel.
(4) Follow all local safety directives.
4. Equipment
NOTE: Equivalent substitute may be used for the following listed item:
NAME
Oxygen service cart
NUMBER
MANUFACTURER
Commercially available
USE
To service oxygen bottle.
5. Charging Oxygen System
A. Charge Oxygen System.
NOTE: Before servicing oxygen system, examine cylinder for condition and hydrostatic test
date. DOT order 8000-40, dated 2 June, 1977, states that a cylinder which remains charged or
partially charged on the due date of its hydrostatic test may remain in service beyond the test
date providing the cylinder is retested prior to its next full or partial filling.
(1) Open the oxygen servicing panel door.
(2) Remove oxygen filler valve dust cap.
NOTE: Support the bracket when loosening dust cap to avoid damaging bracket.
(3) Connect charging cylinder line from the oxygen service cart to filler valve.
(4) Slowly open the charging cylinder valve and charge the airplane oxygen bottle to the
correct pressure 1800 to 1850 PSI (12410.09 to 12755.7 kPa). (Refer to Table 301
and/or Table 302).
CAUTION: AMBIENT TEMPERATURE HAS A DIRECT EFFECT ON INDICATED
PRESSURE.
(5) Shut off oxygen at charging cylinder and disconnect line.
(6) Install dust cap on filler valve and torque approximately 10 to 15 inch-pounds (1.129 to
1.694 Nm).
(7) Close service compartment door.