Table 3-1. Unit Troubleshooting (Cont)
TEST OR INSPECTION
Check oxygen bottle seat.
Reseat oxygen bottle. Refer to paragraph 3-10.3.1.
Open the bottle valve and listen for a short "chirp" from the alarm whistle.
If no "chirp" is heard, replace rebreather system. Notify your supervisor.
High Exhalation Resistance in Face Piece
Check the flapper valves in the face piece (1) for damage or sticking.
Release stuck valves. Replace the mask if the valves are damaged.
Check the relief valve in the center section (11) for damage or sticking.
Clean seating surfaces and replace damaged components. Refer to paragraph 3-
Rebreather Diaphragm Bottoms Restricting Inhalation
Perform the oxygen constant rate flow test.
Replace the restrictor, regulator or valve assembly as necessary. Refer to paragraph
Examine the demand/free flow valve for damage.
Replace the valve core. Refer to paragraph 3-10.3.14.
Rebreather Oxygen Bottle Pressure Gauge Low Pressure Reading
Ensure the oxygen bottle (12) is not cold.
Read the pressure gauge at room temperature (680F).
Oxygen bottle (12) may need a charge.
Turn in oxygen bottle for recharging.
Apply a soapy water solution around the oxygen bottle (12) valve stem and valve handle and
look for bubbles.
If bubbles are identified, replace the oxygen bottle. Refer to paragraph 3-10.3.1.
Notify your supervisor.
Rebreather Breathing Hose Leaks
Examine hoses (5), (6) and (7) for cuts, rips and tears.
Replace damaged hoses. Refer to paragraphs 3-10.3.3 and 3-10.3.9.