Accident Overview
On an unspecified date, a four-engine airplane departed from runway 29 at Tehran-Mehrabad Airport. According to the investigation, while climbing in limited visibility, the aircraft deviated to the right instead of executing the required left turn as specified in the Standard Instrument Procedures (SIPs) for that runway.
Sequence of Events
Shortly after takeoff, the airplane failed to follow the published departure path. It drifted from the intended route and, at an altitude of approximately 6,500 feet, struck the slope of a mountain. The mountain, located 17 kilometers northwest of the airport, has an elevation of 2,020 meters. The impact caused the aircraft to disintegrate.
Occupants and Fatalities
The airplane was carrying five occupants. All five were killed in the accident.
Investigation Findings
The official investigation determined that the accident was a controlled flight into terrain. The probable cause was that the crew failed to follow the published procedures for a standard departure from runway 29.