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Very strange - hopefully the final report will have more information.



I question taking passengers on what appears to be a test flight after heavy maintenance - you want the aircraft as light as possible since the technical status is unknown.


My experience is that after heavy maintenance the aircraft is first run with the cowlings off to check basic system operation and look for any leaks.


Only then is the aircraft run with the cowlings on and only after a successful run up and power check is a test flight done.


Then the aircraft will be released to service.


Unclear how much of this was done.