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Korean Air Lines 642

Accident Case Study




Photo: HL 7412, from Aviation Safety Network.

Accident Report

  • 02 AUG 1976
  • Type: Boeing 707-373C
  • Operator: Korean Air Lines - KAL
  • Registration: HL7412
  • Crew: Fatalities: 5 / Occupants: 5
  • Passengers: Fatalities: 0 / Occupants: 0
  • Total: Fatalities: 5 / Occupants: 5
  • Airplane fate: Written off (damaged beyond repair)
  • Location: 17 km (10.6 mls) WNW of Tehran-Mehrabad Airport (THR) (Iran)
  • Phase: En route (ENR)
  • Nature: Cargo
  • Departure airport: Tehran-Mehrabad Airport (THR/OIII), Iran
  • Destination airport: Seoul-Gimpo (Kimpo) International Airport (SEL/RKSS), South Korea
  • Narrative:


    After takeoff from runway 29, the aircraft deviated from the Standard Instrument Departure (SID) procedure and drifted to the right instead of performing a left turnout. It continued and struck mountains at an altitude of 2020m (6630 feet).


    There is very little out there to explain the crew's actions. There are no reports of aircraft malfunctions. Most of the terrain is to the north and east of the airport but the SID's left turn out could have easily been completed prior to the mountain range which lies about 10 miles north of the airport. While the climb rate wasn't very high, around 250 ft/nm, it wasn't out of the question for this aircraft in the summer time at this elevation. What was clear is that a turn was required

    See Also:

    Controlled Flight Into Terrain


    Aviation Safety Network

Revision: 20130701