A certified maintenance shop must verify the proper
operation of the VHF transceiver or as required by national
regulations.
A complete check of all airplane systems is required to certify that the new
wiring is not causing any malfunction.
The standing wave ratio (SWR) must be less than 3:1.
A test flight is recommended to verify proper transceiver operation.
The following items should be checked:
Check transceiver operation with a radio station at least 50 km away
when at 2000ft or above.
Check if there is unusual electrical interference or noise.
If possible check the transceiver operation on low and high
frequencies of the VHF frequency band.
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