I donīt understand this statement:
"Also, the HUMS appears unable to identify symptoms of such degradation in the epicyclic module"
From the G-REDL report, it is quite clear that there was abnormal HUMS readouts in the days before the accident.ī
But it was not known how to interpret the data,
that showed increased vibrations. According to Eurocopter the debris should be determining the Health of the gearbox and not the HUMS readouts.
So it is strange to me no HUMS readouts on LN-OJF. Still no mention about the problems with the helicopter in the days before the accident.
Would be interesting to understand why AIBN concludes on the HUMS?
What about the chip detectors?
I already read that Visual inspection of gears are done at 2000 hours. up to that spalling can occur, that is not dangerous to the gearbox operation.
"The main gearbox (MGB) was received from Airbus Helicopters after modification, inspection and repair before it was installed in LN-OJF 15 January 2016. At the time of installation, the MGB had accumulated 1 080 hrs since new"
Why is the gearbox modified, inspected and repaired by Airbus at 1080 hours?
I am disappointed in AIBN, a very weak preliminary report
with vague statements.