Date & Time:
Jan 9, 2011 at 1945 LT
Type of aircraft:
Boeing 727-200
Operator:
Registration:
EP-IRP
Flight Phase:
Landing (descent or approach)
Flight Type:
Scheduled Revenue Flight
Survivors:
Yes
Schedule:
Tehran - Orumiyeh
MSN:
20945/1048
YOM:
1974
Flight number:
IR277
Country:
Iran
Region:
Asia
Crew on board:
9
Crew fatalities:
8
Pax on board:
96
Pax fatalities:
70
Other fatalities:
0
Total fatalities:
78
Aircraft flight hours:
9019
Circumstances:
The aircraft departed Tehran-Mehrabad Airport at 1815LT with a delay of more than two hours due to poor weather conditions at destination. While descending to Orūmīyeh Airport by night, the crew encountered poor weather conditions with snow falls, visibility 800 metres and three ceilings at 1,500, 2,000 and 6,000 feet. After the crew was unable to intercept the ILS, the decision to initiate a go-around procedure was taken. Approaching the stall speed, the stick shaker activated and the aircraft probably encountered icing conditions. In a left bank angle estimated between 26 and 40°, the engine n°3 and 1 failed. At an altitude of 600 feet and at a speed of 96 knots, the flaps were retracted, causing the aircraft to stall and to impact the ground. The aircraft broke in three but there was no fire. 70 passengers and 8 crew members were killed while 27 other occupants were injured, some seriously.
Probable cause:
Bad weather conditions for the aircraft and inappropriate actions by cockpit crew to confront the situation is the main cause of the accident. The following contributing factors were identified:
- The old technology of aircraft systems,
- Absence of a suitable simulator for adverse weather conditions,
- Failure to correctly follow the operating manual by the flight crew,
- Inadequate cockpit resources management (CRM).
- The old technology of aircraft systems,
- Absence of a suitable simulator for adverse weather conditions,
- Failure to correctly follow the operating manual by the flight crew,
- Inadequate cockpit resources management (CRM).
