Does this report (I haven't looked at the base report) break it down by operator?
The 747/400/RR operators are BA/QF/CX.
I know BA use F25 as the standard landing config. After BKK, do QF use F30? What about CX?
There could be a correlation between operator, land flap and noise.
Where are the noise measurement points? Could be that the gear lowering points are also relevant....