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4. Release the negative pressure ball. If the negative pressure ball is completed expanded
within 30s, the EFCS flowmeter assembly is damaged.
8.4.3.5 Leakage Test on the System Switch Assembly
Use the following tools to perform the leakage test on the system switch assembly:
One negative pressure ball
One 3106-06-00 adapter connector
One 3126-06-00 tube plug
One PU tube (6X100)
Test procedures:
1. Switch off the pipeline gas source and enable the system switch. Switch on the O2 flush
switch to release the remaining pressure.
2. Remove pipeline 43 connecting the system switch assembly. Disconnect the end
connecting to the flow regulator. Connect the end with the pipeline removed to the
negative pressure ball using the 3106-06-00 adapter connector.
3. Remove pipeline 45 connecting the system switch assembly. Block the end with a
3126-06-00 tube plug.
4. Then, squeeze the negative pressure ball to exhaust all gas inside.
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