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лётное исследование stresses
aerohydr.	flight exploration; flight test investigation
astronaut.	flight investigation; flight study; in-flight research; flight-test investigation
avia.	operational study
avia., med.	field study
Makarov.	flight observation
nano	flight research
лётные исследования
aerohydr.	flight research; flight research work; free-flight research; in-flight research
astronaut.	inflight investigation

лётное исследование: 11 phrases in 5 subjects

Aerohydrodynamics	1
Astronautics	4
Aviation	2
General	1
Military	3