Findings from the fatal accident inquiry into the tragic Clutha bar helicopter disaster are set to be published on Wednesday.

Ten people died when a police helicopter crashed through the roof of the popular pub in 2013.

Pilot David Traill, 51, PC Tony Collins, 43, and PC Kirsty Nelis 36 were among those killed when the Eurocopter EC 135, operated by Bond Air Services, collided with the bar shortly after 10:20pm on November 29.

READ MORE: Clutha tragedy could have been prevented, expert says

Patrons Gary Arthur, 48, Joe Cusker, 59, Colin Gibson, 33, Robert Jenkins, 61, John McGarrigle, 58, Samuel McGhee, 56, and Mark O'Prey, 44 also lost their lives in the tragedy.

Sheriff Principal Craig Turnbull chaired the inquiry between April and August this.

Lawyers representing those injured and killed previously criticised the length of time it took for the inquiry to be held.

The Crown Office announced the probe in 2017, also stating there would be no criminal proceedings brought over the tragedy.

Eyewitnesses told the inquiry they heard a "spluttering noise" similar to the sound of a car stalling and saw the aircraft falling out of the sky second before the crash.

Glasgow Times: Scene of the helicopter crash at the Clutha Bar in Glasgow. Photo credit: Jan Hollands/PA Wire

The helicopter had been returning to its base on the banks of the River Clyde, however Air Accident Investigations Branch (AAIB) experts expressed frustration during their evidence over the lack of data available from the flight regarding fuel or mechanical warnings.

The AAIB report published in 2015 found the pilot did not follow emergency protocol and continued flying despite concerns over fuel transfer pumps being turned off.

READ MORE: Clutha-type helicopter gave false fuel readings, FAI hears

They also cited concerns over a controlled landing failing to be achieved due to “unknown reasons,” and recommended all police helicopters be fitted with black box flight recording equipment.

On the final day of the inquiry, Sheriff Principal Turnbull acknowledged that the delay in holding it had caused great distress.

His final determinations are expected to be released on Wednesday afternoon.