On 10 August 2014, the HESA IrAn-140 twin turboprop serving the flight crashed shortly after takeoff from Mehrabad International Airport, falling into a boulevard near the Azadi Stadium.

[3][4] Iran's Civil Aviation Organization mainly attributed the crash to mechanical error.

Subsequently, investigators also blamed the confusing Aircraft Flight Manual (AFM) that caused the crew to over-estimate the maximum take-off weight.

[3] Sepahan Airlines Flight 5915 was scheduled to fly to Tabas, a major city in South Khorasan province from Iranian capital Tehran.

Flight 5915 took off from Tehran's Mehrabad International Airport from Runway 29L at 09:22 a.m local time.

However, due to miscommunication and poor coordination, the team didn't reach the crash site in a timely manner.

[3] The pilot not-flying was a 32-year-old captain and had accumulated a total flying time of 572 hours, 400 of which were on the Antonov An-140.

Analysis on the aircraft's logbook revealed that numerous errors and failures had been recorded on the right engine.

[3] Just 3 days before the crash, on 7 August, during its flight from Tabriz to Isfahan, a violent shaking was recorded on the right engine.

[3] Further investigation revealed that the right engine failure was caused by a malfunction on the aircraft's fuel supply system.

This was due to the fact that previous occurrences revealed that the system had caused numerous engine failures with a rate that was above the acceptable level.

This was due to the Aircraft Flight Manual (AFM) that was not clear and was deemed as confusing by investigators.

During the takeoff roll, a malfunction in the electronic fuel delivery system caused a loss of power in the right engine.

Two seconds later, although rotation speed had not yet been reached, the captain brought the plane into the air.

Shortly afterwards, the crew noticed the engine failure but did not immediately attempt to feather the propeller.

The plane began to lose airspeed, reaching a maximum height of 40 metres (130 ft) before descending and eventually entering an aerodynamic stall.

By the time the crew feathered the propeller, 17 seconds after the initial failure, it was too late to recover the plane, which impacted a highway 1.6 kilometres (0.99 mi; 0.86 nmi) from the end of the runway.