 | Aircraft | Location & Date | | | | Remarks | Photographer / Copyright owner | | Trials of the HAI-31A on water. On the pilot seat is Mr P. W. Dimitrov, on the right stands Mr S. M. Ryabikov. | Leonid Koziarczuk |
 | Aircraft | Location & Date | | | | Remarks | Photographer / Copyright owner | | HAI-31A in flight towed by a motor boat. | Leonid Koziarczuk |
 | Aircraft | Location & Date | | | | Remarks | Photographer / Copyright owner | | HAI-31A in flight towed by a motor boat. | Leonid Koziarczuk |
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