28
Functional Tests
G1 SCBA 2018 Edition
US
(10) Pull on the regulator to make sure the attachment is tight.
(11) Inhale sharply to start air flow.
(12) Breathe normally.
(13) Make sure the regulator responds correctly. The regulator should NOT make sounds such as
whistling, chattering, or popping.
(14) Push the release buttons on the regulator and remove the regulator from the facepiece.
(15) Make sure air flow stops.
(16) Remove the facepiece from the face.
5.3 Control Module, Power Module, HUD, and Primary Low-Pressure Warning Device Operation
WARNING!
Do NOT disconnect the coupling nut when the analog pressure gauge shows air pressure. Turn the
regulator bypass knob counterclockwise to open the regulator bypass valve, or if equipped, push the
purge button, to release all pressure from the SCBA.
Removing the coupling nut while the SCBA is pressurized can result in serious personal injury or
death, or damage to equipment.
5.3.1 SCBAs with an Integrated PASS Device
To make sure all lights are visible during functional testing, align the control module, regulator, and
SCBA as shown below.
(17) Make sure the regulator bypass valve operates
correctly.
a) Turn the regulator bypass knob counterclockwise to
open the regulator bypass valve.
b) Listen for airflow.
c) Turn the regulator bypass knob clockwise to close
the regulator bypass valve.
d) Reach behind and turn the handwheel clockwise to
close the cylinder valve fully.
e) Listen for air leaks.
f) Monitor the pressure indicators (pressure gauge,
control module, HUD) for 10 seconds. Make sure
pressure does not decrease more than 100 psi in
10 seconds.
g) If the pressure decreases more than 100 psi in
10 seconds, remove the SCBA from service.
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