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Accident: Beechcraft 200 Super King Air hit snow bank at Bariloche, Argentina
17 July 2017

Accident: Beechcraft 200 Super King Air hit snow bank at Bariloche, Argentina

Serious near miss incident when approaching A320 lines up with occupied taxiway, San Francisco

Accident: Martinaire Cessna 208B Cargomaster impacted terrain near Alpine, Texas, USA

Accident Antonov 2: impacted terrain, Kiliya District, Ukraine; both crew survived

ATSB issues investigation update of Saab 340B in-flight loss of propeller incident

The ATSB issued an update of their investigation into the in-flight loss of a Saab 340B propeller in March 2017.

Since the occurrence, the ATSB has been working closely with the engine manufacturer, GE Aviation, in order to establish the factors that led to cracking and fracture of the main propeller shaft from the Regional Express (REX)-operated SAAB 340B aircraft, VH-NRX.

The engine manufacturer’s preliminary metallurgical analysis of the fractured shaft has identified that fatigue cracking in the propeller main shaft originated within a dowel pin bore that was located on the forward face of the propeller flange from the propeller reduction gearbox (PGB). Their analysis indicates that the initiation of fatigue cracking within the hub flange may be associated with a combination of factors that include:

  • the accumulation of significant operational hours for each propeller reduction gearbox
  • the development of pitting corrosion damage within the dowel pin bore and at the front face of the propeller flange
  • progressive wear and subsequent surface damage of the hub flange at stress-critical regions surrounding the dowel pin.

GE Aviation have released two service bulletins (SBs) to help understand the potential fleet risk for fatigue cracking in other CT7 PGB main propeller shafts.

More information:

Accident: Beechcraft 200 Super King Air, gear-up landing, Bamako, Mali

Serious incident: Antonov An-32B runway excursion on landing, Tarapacá Airport, Colombia

Serious incident: Airbus A330-200 loss of engine inlet cowling on departure from Sydney Airport, Australia

Accident: Antonov TVS-2MS (An-2 turbine), takeoff accident, Ulan Bator, Mongolia

Incident: A320 premature departure turn towards terrain, below MSA at Hong Kong