3-9. EMERGENCY BREATHING APPARATUS (EBA) MAINTENANCE INSTRUCTIONS. (CONT)
Check that the air supply line (13) is properly attached to the EBA tether line connection (14) and that air is being
provided at 85-90 PSIG.
When testing the cylinder air source, check that the cylinder valve (16) is fully open.
Check that the regulator valve (15) is completely open.
Check the breathing tube (10) for tight connections at the tester inlet connection (6) and regulator outlet (11).
Check that the breathing tube (10) is straight.
Depressurize the system and check the height of the regulator lever assembly as follows:
Remove the regulator cover and diaphragm. Refer to paragraph 3-9. 2. 7.
Place a straight edge across the top of the regulator.
If the regulator is properly adjusted the straight edge should be flush with (ust touch) the end of the short
lever arm (16) without exerting pressure on the lever assembly.
If adjustment is required, loosen the lever assembly locknut (17).
Using a fine flat blade screw driver, turn the adjusting screw (18) clockwise to raise or counterclockwise to
lower the lever arms until the end of the short lever arm (16) is flush with the straight edge.
Secure the adjusting screw (18) by holding it in place with the screwdriver and tightening the lever assembly
Install the diaphragm and regulator cover. Refer to paragraph 3-9. 2. 7.
Repeat the Air Flow Performance Test. If performance is still unacceptable, adjust the regulator control plate (19)
Depressurize the system and disconnect the breathing tube (10) from the regulator outlet (11).
Equipment damage. Do not loosen the control plate retaining screw and only make small adjustments to
the control plate (1/64" to 1/16"). The retaining screw is secured with a sealant and may break with
excessive adjustment. If the screw turns during adjustment or the control plate is lose after adjustment,
the control plate and screw were improperly installed and the regulator must be replaced.
If the pressure gauge reading was less than 0 inches of water, use a flat blade screwdriver to rotate the
control plate (19) clockwise 1/64" to 1/16".
If the pressure gauge reading was greater than (+) 2. 4 inches of water, use a flat blade screw driver to
rotate the control plate (19) counterclockwise 1/64" to 1/16".
Connect the breathing tube (10) to the regulator outlet (11) and repeat the Airflow Performance Test.