| Accident summary | |
|---|---|
| Date | January 21, 1980 |
| Type | Inoperable ILS and ground radar |
| Site | Alborz Mountains, Iran |
| Passengers | 120 |
| Crew | 8 |
| Fatalities | 128 |
| Survivors | 0 |
| Aircraft type | Boeing 727-86 |
| Operator | Iran Air |
| Tail number | EP-IRD |
| Flight origin | Mashad Airport (MHD/OIMM), Iran |
| Destination | Tehran-Mehrabad Airport (THR/OIII), Iran |
On January 21, 1980, an Iran Air Boeing 727-86 was making a domestic flight from Mashad Airport to Tehran-Mehrabad Airport in Iran. At 1911h local time, the aircraft, registered as EP-IRD, collided with the Alborz Mountains, 29 kilometres (18 mi) north of Tehran, during its approach to Tehran-Mehrabad runway 29 in foggy and snowy weather conditions.[1] All 8 crew members and 120 passengers died in the accident, and the plane was destroyed.[2] At the time, it was the deadliest aircraft disaster in Iranian history.
Investigators concluded that the probable cause of the crash was believed to be an inoperable instrument landing system and ground radar.[1]
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