Taban B734 at Ardabil on Mar 27th 2017, right main gear collapse on landing
Last Update: January 28, 2018 / 17:08:22 GMT/Zulu time
On Jan 27th 2018 Iran's CAO released their final report in Persian concluding the probable causes of the accident were:
The main cause of the accident is a technical failure in the shimmy damper of the right main landing gear.
Contributing factors were:
- failure to comply with operational limitations by the pilot
- lack of technical oversight and non-compliance with manufacturer's recommendations
- design weakness in the landing gear, in particular shimmy damper system and metallurgy causing a weak torsion link piece
- inefficiency of quality control within maintenance of Taban Airlines
The CAO reported the aircraft had been dispatched to cruise at FL280 in non-RVSM airspace, the crew however climbed the aircraft to FL300. The crew performed an ILS approach to runway 33 for an overweight landing (as result of the lesser fuel burn than anticipated during cruise), the winds were reported from 200 degrees at 12 knots. The aircraft crossed the final approach fix at 216 KIAS (should be crossed at or below 185 KIAS), the EGPWS sounded "Sink Rate" aural warnings several times during the final approach, the aircraft crossed the runway threshold still at a speed higher than Vapp at a crab angle of 8 degrees due to crosswind, the aircraft touched down about 830 meters past the runway threshold at about 1600 fpm rate of descent and about 2.06G, the pilot input on the rudder pedals caused shimmy vibrations, the right hand main gear's shimmy damper failed to dampen the vibrations, during the roll out the torsion link fractured as result of the vibrations causing the right main gear strut to fold. The aircraft continued for another 1450 meters on left main gear and right engine pod until the aircraft came to a stop on the runway. The aircraft was evacuated, one passenger received a minor injury as result of the evacuation.
The CAO reported that there had been similiar occurrences prior to this accident, Boeing therefore had released a safety letter recommending non-mandatory inspections.
A1033/17 - RWY 15/33 CLSD DUE TO DISABLE ACFT, USABLE ONLY FOR TAXI. 28 MAR 06:07 2017 UNTIL 28 MAR 15:30 2017 ESTIMATED. CREATED: 28 MAR 06:15 2017
OITL 270700Z 20025KT 9999 FEW035 SCT200 14/M02 Q1016=
OITL 270651Z 20025KT 9999 FEW035 SCT200 14/M02 Q1016=
OITL 270630Z 20025KT 9999 FEW035 SCT200 14/M02 Q1016=
OITL 270600Z 20023KT 9999 FEW035 SCT200 13/M02 Q1016=
OITL 270552Z 20023KT 9999 FEW035 SCT200 13/M02 Q1016=
OITL 270530Z 20017KT 9999 FEW035 SCT200 12/M02 Q1017=
OITL 270500Z 25006KT CAVOK 06/M02 Q1017=
OITL 270451Z 25006KT CAVOK 06/M02 Q1017=
OITL 270430Z NIL=
OITL 270400Z 15006KT CAVOK 05/M04 Q1017=
OITL 270350Z 15006KT CAVOK 05/M04 Q1017=
OITL 270330Z NIL=
OITL 270300Z 27008KT CAVOK M02/M04 Q1016=
OITL 270250Z 27008KT CAVOK M02/M04 Q1016=
OITL 270200Z NIL=
This article is published under license from Avherald.com. © of text by Avherald.com.
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