Overview
On an unspecified date, a twin-engine aircraft was engaged in the calibration of the Instrument Landing System (ILS) at Tehran-Mehrabad International Airport. While approaching the airport from the northwest, the crew encountered poor visibility due to heavy rainfall. The aircraft struck the slope of a mountain shrouded in clouds near the locality of Khozankala, approximately 33 km northwest of the airport.
Accident Details
The aircraft was destroyed upon impact. All four crew members on board were killed. The wreckage was located near the Amir Kabir Dam.
Investigation
The accident investigation focused on the circumstances of the flight. No probable cause has been stated in the official source.
Aftermath
The crash resulted in the total loss of the aircraft and the deaths of all four crew members, who were involved in the critical task of calibrating navigational aids at one of Iran's major airports.