Shakedown cruise, e.g (5,3)
I believe the answer is:
trial run
(Other definitions for trial run that I've seen before include "Rehearsal" , "Pilot" , "Practice attempt" , "Test, try-out" , "test-drive" .)
I believe the answer is:
trial run
(Other definitions for trial run that I've seen before include "Rehearsal" , "Pilot" , "Practice attempt" , "Test, try-out" , "test-drive" .)