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Last updated: 20 September 2018
Status:Preliminary
Date:Sunday 18 February 2018
Time:09:32
Type:Silhouette image of generic AT72 model; specific model in this crash may look slightly different
ATR 72-212
Operator:Iran Aseman Airlines
Registration: EP-ATS
C/n / msn: 391
First flight: 1993-10-26 (24 years 4 months)
Engines: 2 Pratt & Whitney Canada PW126
Crew:Fatalities: 6 / Occupants: 6
Passengers:Fatalities: 60 / Occupants: 60
Total:Fatalities: 66 / Occupants: 66
Aircraft damage: Destroyed
Aircraft fate: Written off (damaged beyond repair)
Location:15 km (9.4 mls) NE of Yasuj Airport (YES) (   Iran)
Crash site elevation: 3600 m (11811 feet) amsl
Phase: En route (ENR)
Nature:Domestic Scheduled Passenger
Departure airport:Tehran-Mehrabad Airport (THR/OIII), Iran
Destination airport:Yasuj Airport (YES/OISY), Iran
Flightnumber:EP3704
Narrative:
Iran Aseman Airlines flight 3704 from Tehran to Yasuj, Iran, impacted a mountainside in the Mount Dena range to the northeast of Yasuj Airport. All on board (60 passengers, two flight crew members, two cabin crew members and two security officers) were killed.
The flight departed Mehrabad Airport at 08:05 hours local time and climbed to the cruising altitude of FL210. At 09:22 the aircraft was over the Isfahan (IFN) VOR. The flight requested permission to descend from FL210 to FL170. This was approved by Tehran ACC. The flight followed Airway W114 from the OBTUX navaid to the Yasuj DVOR/DME. Minimum altitude on that airway is FL170. Minimum safe altitude over the sector close to Yasuj Airport is 15500 feet.
Flight tracking website Flightradar24 shows that the aircraft reached FL170 at 09:25:59. At 09:29:10 the aircraft was 14 nautical miles from the airport. Last radio contact with the flight was at 09:30:10, when the pilots acknowledged a weather report.
At 09:32:00 the pilot keyed the mic but there was no transmission. Attempts to contact the flight by the Yasuj controller at 09:34 were fruitless.
The wreckage was located the following day at an elevation of about 3600 m (11800 feet). Weather conditions at the crash site included snow and strong winds.

The approach procedure for Yasuj Airport is a circling NDB approach with a 25NM minimum safe altitude circle of 11500 ft - 15500 ft. Flights from Tehran first have to cross Mount Dena, which is an 80 km mountain range with a highest elevation of 4,409 m (14,465 ft). After arriving over the NDB at the airport at 15,000 feet, a teardrop approach has to be flown for landing on runway 13/31.

Sources:
» PressTV
» Mehr News

METAR Weather report:
05:30 UTC / 09:00 local time:
OISY 180530Z 09004KT 9999 FEW035CB SCT040 OVC090 14/M01 Q1022

06:00 UTC / 09:30 local time:
OISY 180600Z 13004KT 9999 FEW035CB SCT040 OVC090 13/M00 Q1021

06:30 UTC / 10:00 local time:
OISY 180630Z 14006KT 9999 FEW035CB SCT040 OVC090 15/M02 Q1021


Photos

photo of ATR 72-212 EP-ATS
debris on mountain slope
photo of ATR 72-212 EP-ATS
accident mountain
photo of ATR 72-212 EP-ATS
Direct line from OBTUX navaid to Yasuj DVOR/DME; accident location 2 km to the left
photo of ATR 72-212 EP-ATS
Yasuj approach chart with accident location
photo of ATR 72-212 EP-ATS
Add your photo of this accident or aircraft
 

Aircraft history
date registration operator remarks
26 Oct. 1993 F-WWED ATR first flight
12 Dec. 1993 EP-ATS Iran Aseman Airlines delivered
2011 EP-ATS Iran Aseman Airlines stored at Shiraz
Nov. 2017 EP-ATS Iran Aseman Airlines restored to service

Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Tehran-Mehrabad Airport to Yasuj Airport as the crow flies is 551 km (345 miles).
Accident location: Approximate; accuracy within a few kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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ATR-72

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