Incident Overview
Description
Scoot flight TR897, a Boeing 787-9 Dreamliner, lost the nose landing gear left hand wheel during takeoff from Seoul-Incheon International Airport (ICN/RKSI). After landing in Taipei and arriving at the gate, wheel was found missing. Results of metallurgical examinations suggest that the LH nose wheel inboard bearing had seized. This seizure resulted in the generation of high heat and eventually intergranular fracture of the LH axle. The seizure was likely due to roller skewing. However, the cause of the rollers skewing could not be determined. Visual bearing inspection is subjected to human factors in the inspectors? ability to spot defects, in particular defects on the inner race surface, given the limited access. This can result in inconsistent inspection outcome. The investigation team could not establish the cause of corrosion found on the outboard bearing cup. However, the corrosion was not the cause of the inboard bearing failure.
Source of Information
https://focustaiwan.tw/society/202306190006, https://bea.aero/en/investigation-reports/notified-events/detail/accident-to-the-boeing-787-registered-9v-ojf-operated-by-scoot-at-incheon/, https://www.flightradar24.com/data/flights/tr897#30c58563https://focustaiwan.tw/society/202306190006, https://bea.aero/en/investigation-reports/notified-events/detail/accident-to-the-boeing-787-registered-9v-ojf-operated-by-scoot-at-incheon/, https://www.flightradar24.com/data/flights/tr897#30c58563Primary Cause
Roller skewing caused by the lack of access to the outboard bearing cup during visual bearing inspection.Roller skewing caused by the lack of access to the outboard bearing cup during visual bearing inspection.Share on:
