ASN Aircraft accident Boeing 737-4Q8 EP-TBJ Ardabil Airport (ADU)
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Status:Accident investigation report completed and information captured
Date:Monday 27 March 2017
Type:Silhouette image of generic B734 model; specific model in this crash may look slightly different
Boeing 737-4Q8
Operator:Taban Air
Registration: EP-TBJ
MSN: 28202/3009
First flight: 1998-03-02 (19 years 1 month)
Total airframe hrs:46231
Engines: 2 CFMI CFM56-3C1
Crew:Fatalities: 0 / Occupants: 12
Passengers:Fatalities: 0 / Occupants: 173
Total:Fatalities: 0 / Occupants: 185
Aircraft damage: Substantial
Aircraft fate: Repaired
Location:Ardabil Airport (ADU) (   Iran)
Phase: Landing (LDG)
Nature:Domestic Scheduled Passenger
Departure airport:Mashhad Airport (MHD/OIMM), Iran
Destination airport:Ardabil Airport (ADU/OITL), Iran
Taban Air flight 6243, a Boeing 737-400, suffered severe vibrations on touchdown on runway 33 at Ardabil Airport, Iran. The right-hand main gear leg folded inwards and the aircraft tilted to the right, causing the no.2 engine to hit the runway.

The aircraft was ferried to Mashhad on May 1 and test flown after repairs on June 18, 2017. It re-entered service on June 21.

Probable Cause:

Main cause:
The main cause of the crash was a technical failure in the Shimmy Damper of the right-hand landing gear system.
Contributory factors:
- Failure to comply with the pilot's operating instructions
- Lack of technical supervision and disregard for the manufacturer's publications
- Weak design of landing gear control systems) Inspection of Shimmy Damper system and poor Torsion Link metallurgy
- Lack of quality oversight of Taban Airlines technical training units

Accident investigation:
Investigating agency: AAIB Iran
Status: Investigation completed
Duration: 295 days (10 months)
Accident number: A960107EPTBJ
Download report: Final report

Landing gear collapse
Runway mishap

METAR Weather report:
05:00 UTC / local time:
OITL 270500Z 25006KT CAVOK 06/M02 Q1017

06:00 UTC / local time:
OITL 270600Z 20023KT 9999 FEW035 SCT200 13/M02 Q1016


photo of Boeing-737-4Q8-
Boeing 737 main gear torsion links

Video, social media

Aircraft history
date registration operator remarks
2 March 1998 TC-APP Boeing first flight
31 March 1998 TC-APP Pegasus delivered
2 Nov. 1998 TC-APP Winair leased
20 Nov. 1999 TC-APP Oman Air leased
9 June 2002 TC-APP Pegasus returned
28 March 2003 SP-KPI Polonia leased from ILFC
20 Dec. 2004 N401LF ILFC returned
23 Feb. 2005 VT-SJB Air Sahara leased
18 May 2008 OO-VET Brussels Airlines leased
19 Nov. 2013 EY-754 Tajik Air
8 July 2015 EY-754 Taban Airlines leased
26 July 2016 EP-TBJ Taban Airlines new registration

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 Mashhad Airport to Ardabil Airport as the crow flies is 1012 km (632 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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