A PIA Pakistan International Airlines Avions de Transport Regional ATR-72-212A, registration AP-BKX performing flight PK-580 from Karachi to Multan (Pakistan), was accelerating for takeoff from one of the runways 25, when the crew rejected takeoff due to a problem with the right hand engine (PW127) and returned to the apron.
Pakistan's AIB rated the occurrence a serious incident and opened an investigation.
Pakistan's BASIP released their final report on Aug 6th 2026 concluding the probable causes of the serious incident were:
Cause
The aborted take-off occurred as a result of a fracture of the second-stage power turbine blade(s) in the PW127M engine. The fracture originated from leading-edge cracks caused by Type I sulphidation hot corrosion, which propagated by fatigue and culminated in overload failure of the blade(s).
Contributory Factors
Susceptibility of the Second Stage Power Turbine Blade
Configuration
The blade configuration installed on the incident engine remained susceptible to sulphidation-related leading-edge degradation despite incorporation of SB 21876.
Known in-service trend
Prior to the incident, P&W Canada had identified a continuing trend of secondstage power turbine blade distress involving post-SB 21876 blades and had issued SB 21917 and SIL PW100-188 as further mitigation measures.
Pakistan's AIB rated the occurrence a serious incident and opened an investigation.
Pakistan's BASIP released their final report on Aug 6th 2026 concluding the probable causes of the serious incident were:
Cause
The aborted take-off occurred as a result of a fracture of the second-stage power turbine blade(s) in the PW127M engine. The fracture originated from leading-edge cracks caused by Type I sulphidation hot corrosion, which propagated by fatigue and culminated in overload failure of the blade(s).
Contributory Factors
Susceptibility of the Second Stage Power Turbine Blade
Configuration
The blade configuration installed on the incident engine remained susceptible to sulphidation-related leading-edge degradation despite incorporation of SB 21876.
Known in-service trend
Prior to the incident, P&W Canada had identified a continuing trend of secondstage power turbine blade distress involving post-SB 21876 blades and had issued SB 21917 and SIL PW100-188 as further mitigation measures.
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