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Published on : Thursday, April 13, 2017
The incident occurred after one of its propellers flew off in mid-flight above south-west Sydney many weeks ago. According to a preliminary report that was released on Thursday, the Australian Transport Safety bureau declared that a fatigue had started inside the propeller’s gear box prior to spreading to a shaft portion.
The Saab 340 plane was carrying 16 passengers and three crew members and had to make an emergency landing at Sydney Airport on 17th March.
Actually, the propeller narrowly missed the wing and the tail. Later, it was found in the bushland in south-west Sydney. The investigators also discovered that a dowel pin close to the front of the propeller was corroded.
Currently, they are investigating whether the corrosion or other factors were responsible for the fracture.
The air safety bureau said that the ‘critical failure of this type’ was the first time it was said to have begun inside the propeller hub flange of a General Electric Aviation engine of the type that was fitted to the Regional Express plane.
Besides, the investigators also mentioned that the maintenance manuals did not require the engineers to work on any routine inspections within dowel pin bores.
The two pilots of the plane had first observed the uncommanded engine indications about 55 miles south-west of Sydney Airport during the flight from Albury. While they were undertaking the checks, they had felt minor vibrations from the right-hand engine of the plane that had worsened even as the pilots carried out the checks.
While the pilots were shutting down the engine, the propeller sheared away and then disappeared into the distance.
Later, they landed safely at the Sydney Airport.