Vision B732 at Lahore on May 9th 2016, engine shut down in flight
Last Update: April 1, 2020 / 15:51:52 GMT/Zulu time
Pakistan's CAA released their final report concluding the probable cause of the serious incident was:
The engine in-flight shut down took place due to premature failure of one of the 1st stage HPT blade fracture due to fatigue originating from the airfoil trailing edge.
The CAA reported the FDR recordings confirm the left hand engine failed at 525 feet AGL.
A post flight inspection of the engine found no evidence of any foreign object ingestion. The blades of the last low pressure turbinece were found damaged. A tear down examination revealed a blade at the high pressure turbine stage 1 had fractured and separated at the blade platform due to fatigue, the two adjacent blades as well as 5 other HPT stage 1 blades had fractured and separated at about mid span as collateral damage, all other blades of the HPT stage showed impact damage.
Although the failure of HPT blades was a known weakness at least since 1990, this particular failure was only the second case where the fracture originated from the airfoils trailing edge.
This article is published under license from Avherald.com. © of text by Avherald.com.
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