The official state-run ISNA news agency in Iran wrote, “Two days after the unfortunate story of the Iran-140 airliner crash, huge amount of news and reports have been published in this regard…”

Alarm bells in Isfahan of a possible crash
Prior to the crash, the ground engineering group in its inspections came to realize a serious weakness in the Iran-140 propeller engines, reporting one of the motors had problems and the other cannot run the plane if the first motor fails.
On the day of the incident the Ukrainian crew and foreign pilot acted more wisely than the Iranians, and as indicated in the flight list (with many handwritten corrections) they refused to fly and said they were ill. Then two Iranian pilots were entered in the new list, both of whom were killed in this flight.

4 terrifying minutes and pilot disobeying orders
All in all, Iran-140 boarded its passengers and took off. Two minutes later the right motor fails. Amidst all this, the plane leans to its left and the tower orders the pilot to make a U-turn to its left (counterclockwise) and reenter Mehrabad Airport from the Kan River direction. However, since the plane didn’t have much of an altitude it did not fully follow the orders and continued its path in the opposite direction. Probably assuming he would not reach the necessary altitude and would crash into residential buildings in the ‘Tehransar’ district, the pilot preferred to do a U-turn through his right in order to land the plane on a highway. He pulled the plane up to reach the necessary altitude. However, the power of the single motor didn’t allow him to continue this trend and his plane came in contact with high voltage cables, resulting in the tail being ripped off and the fuel tank exploding.
The plane wings rip off while nose-diving and the plane slams into the ground with its wings and tails, leading to a huge fire in the fuselage. It is also necessary to say that since the plane had only taken off a short while ago, a large amount of fuel was still stored in its wings and due to the highly inflammable nature of this type of fuel the resulting explosion and fire was very massive.

Airplane motors unfit for Iran weather conditions
In analyzing the events of this flight, an aeronautics expert reminds us in saying, “This plane is designed for regional flights and this is probably why IranAir refused to accept the Antotov 140 planes in its fleet.”
He also referred to the type of the motor used in this plane and emphasizes, “The initial design of this motor was intended for helicopters. This motor didn’t have the capacity for a 50-passengery flight, and the number of passengers in an Antonov 140 plane must be between 35 to 40. This is while this plane was flying with 50 passengers. This plane was carrying 1 to 1.5 tons more weight and this may be one of the reasons its motors failed.”