8-45
Test procedures:
1. Switch off the gas source switch and switch on the O2 flush switch to release the
remaining pressure.
2. Disconnect pipeline 47. Remove only the end of the pipeline connecting to the pressure
regulator assembly.
3. Connect a PU tube (8X200) to the O2 inlet of the pressure regulator assembly. Connect
another end of the PU tube and the removed end of pipeline 47 to two connectors of the
3140-08-00 Y-shape tube.
4. Connect the test pressure gauge to the third connector of the 3140-08-00 Y-shape tube
using the 3106-06-08 adapter connector and 3106-04-06 adapter connector.
5. Switch on the pipeline O2 source.
6. Enable the system to enter standby mode.
7. Switch off all flow regulators.
8. Switch off the pipeline gas source (if the reading on the test pressure gauge is sharply
decreased and continues to decrease after the gas source is switch off, one or more
components among the O2 inlet assembly, exhalation valve assembly, O2 flush switch
assembly, system switch assembly and O2 flow regulator have encountered leakage).
Fix the leakage issue and continue the subsequent operations. Locate the fault according
to fault locating methods for O2 inlet assembly in section 8.4.3AG Transmission
System and section 8.4.4 Breathing System.
9. Manually adjust the O2 flow regulator until the O2 flow reaches 1 L/min, to gradually
decrease the reading on the test pressure gauge to 0.25 MPa (2.5 bar).
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