For the remaining avionic equipment repeat all interference checks during a flight and include all
equipment not previously checked out on ground. A communication performance test in the low, mid
and high frequency band of the 620X should be included.
• Verify the receiver output produces a clear and understandable audio output.
• Verify the transmitter by contacting another station and getting a report of reliable
communications.
• Perform the range check with a station at least 100 m from your own position.
• Check the intercom function by talking into the microphone, while the engine is running at
cruising rpm. You should hear yourself and/or your co-pilot loud and clear.
• Switch "ON" the squelch and check that the normal radio noise, without a present carrier
signal, it will be constantly suppressed. The threshold of the squelch can be set in the
user menu.
4.1.6. Flight Test Check
It is highly recommended to perform flight test as final installation verification. The performance of the
620x may be verified by contacting a ground station at a range of at least 50 NM while maintaining an
appropriate altitude and over all normal flight attitudes.
• Check the performance in the low, mid and high band frequencies.
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