A skydiver reported that the jump aircraft may have experienced an inflight upset.

Narrative:

At 1;500 feet; all skydivers took off their seat belts. Immediately afterwards; the plane rolled over nearly if not 90 degrees and then went into a dive. It fired 3 skydivers reserve parachutes inside the plane. We landed and exited without further incident. They [skydiving company] had a dismissive attitude about the event; but I believe it needs [to be] addressed. If they had hit another plane; there would have been deaths and had the door been open; which many times it is; we would've all been sucked out in a tangled pile. I hope that this is the correct way of reporting the incident as I couldn't find another source. Thank you for your time.

Original NASA ASRS Text

Title: A skydiver reported that the jump aircraft may have experienced an inflight upset.

Narrative: At 1;500 feet; all skydivers took off their seat belts. Immediately afterwards; the plane rolled over nearly if not 90 degrees and then went into a dive. It fired 3 skydivers reserve parachutes inside the plane. We landed and exited without further incident. They [skydiving company] had a dismissive attitude about the event; but I believe it needs [to be] addressed. If they had hit another plane; there would have been deaths and had the door been open; which many times it is; we would've all been sucked out in a tangled pile. I hope that this is the correct way of reporting the incident as I couldn't find another source. Thank you for your time.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1577367
Time
Date	201809
Aircraft 1
Make Model Name	Twin Otter DHC-6
Operating Under FAR Part	Other Skydive/Parachute Operations
Flight Phase	Cruise
Flight Plan	VFR
Person 1
Function	Skydiver
Events
Anomaly	Deviation - Procedural Other / Unknown