Taban MD88 at Najaf on Jun 6th 2019, rejected takeoff due to engine failure

Last Update: June 27, 2019 / 07:59:40 GMT/Zulu time

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Incident Facts

Date of incident
Jun 6, 2019

Classification
Incident

Airline
Taban Air

Flight number
HH-258

Departure
Najaf, Iraq

Destination
Mashhad, Iran

Aircraft Registration
EP-TBE

ICAO Type Designator
MD88

A Taban Air McDonnell Douglas MD-88, registration EP-TBE performing flight HH-258 from Najaf (Iraq) to Mashhad (Iran), was accelerating for takeoff from Najaf's runway 28 when the crew rejected takoff at low speed due to the failure of the right hand engine (JT8D). The aircraft slowed safely and returned to the apron.

The occurrence aircraft remained on the ground in Najaf for 60 hours before returning to service.

Iran's AIB have opened an investigation into the occurrence rated an incident.

On Jun 26th 2019 Iran's AIB released their final report concluding the probable cause of the incident was:

There was an internal damage in the turbine rotors, as a result of fatigue and possible back pressure resulting from stall and engine "Surged". The damage led to subsequent failures of airstream and a general failure of engine failure.

The AIB analysed:

Damage observed in the turbine section was consistent with a disruption in airflow from the compressor resulting in increased exhaust temperatures beyond the limits of the turbine components. Due to the mechanical damage to the engine, the origin of the engine failure and an accurate assessment of the engine condition prior to the occurrence could not be established with certainty but probably by considering effects of above factors, engine compressor stall occurred with high EGT and Vibration exponentially until they reach above their allowable limits. Engine hot zone parts was on exposure to high temperature leaded to fracture of low-pressure turbine 4th stage rotor blades at root which had been creep and elongated before. The number of turbine rotor airfoils that exhibited fatigue is consistent with significant vibratory excitement of turbine stages. Prior to the engine failure, a liberated piece of material, either just preceding or just following from HPT, could travel aft, inducing damage to subsequent turbine stages and resulting in reduced N1 and the subsequent engine failure.
Incident Facts

Date of incident
Jun 6, 2019

Classification
Incident

Airline
Taban Air

Flight number
HH-258

Departure
Najaf, Iraq

Destination
Mashhad, Iran

Aircraft Registration
EP-TBE

ICAO Type Designator
MD88

This article is published under license from Avherald.com. © of text by Avherald.com.
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