There were 211 passengers on board the Boeing 777-300ER, which made an emergency landing in Bangkok.
Sanctions have prevented Iran from procuring new aircraft or equipment, which have been linked to aviation accidents.
Boeing, founded in 1916, has experienced good times and bad during its more than 100 years in the air.
Consultants overseeing process say they hope to get the airline’s four planes back in the skies as soon as possible.