8-32 Disassembly/Reassembly Procedures: Ensuring Radio Submergibility
8.7.7.2 Test Procedure
Figure 8-46. Attaching Vacuum Test Fixture
1. Place the radio in the vacuum test fixture. Ensure the radio position is lay perfectly into the
mold.
2. Pull the knob on the Vacuum Pump to create vacuum. The vacuum test pressure should be
6.6 inHg.
3. Observe the gauge for approximately 2 minutes.
• If the needle falls less than 0.5 inHg, the radio passes the vacuum test.
i. If the seal passes this inspection, this radio is approved for submergibility. No additional
testing is required.
ii. Replace the vacuum port seal and ventilation label as described in the reassembly
procedures.
• If the needle falls more than 0.5 inHg, the radio fails the vacuum test and the radio might
leak if submerged. Additional troubleshooting of the radio is required.
Ensure that the vacuum pressure NEVER exceeds 7 inHg.
The radio has pressure sensitive components that can be
damaged if the pressure exceeds this limit.
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