An Iran Aseman Fokker 100, registration EP-ATF performing flight EP-833 from Ahwaz to Tehran Mehrabad (Iran) with 94 passengers and 7 crew, was climbing through FL150 out of Ahwaz when the crew needed to shut the left hand engines (Tay 650) down following a high engine oil temperature indication. The aircraft returned to Ahwaz for a safe landing about 25 minutes after departure.
On Jun 3rd 2020 Iran's AIB reported the crew encountered high engine oil temperatures, shut the engine down and returned to Ahwaz.
The AIB reported the engine had still 5,400 cycles of life remaining. Preliminary studies show an engine defect had been repaired at a foreign repair center. This fault, before the previous occurrence, see also Incident: Iran Aseman F100 at Tehran on May 30th 2020, engine shut down in flight, was unrelated and had not been repetitive. A specialist group was formed to investigate the occurrences.