Originally Posted by
SpamCanDriver
If the liftoff time from the report is before the supposed liftoff time on FR24 (when it goes above 0ft) then obviously FR24 is in error.
Although I don't know the resolution of the timing data on FR24, it should be possible to make a gross error check.
OK, I think I see what you mean, although I'm still struggling to understand what a "gross error check" would prove, other than the existence of the FR24 QNH issue that I previously referred to.
Using the time from the report, you should be able to roughly estimate where on the rwy it did become airborne. Again subject to FR24 data being sufficient
Yes, that's more easily ascertained from the FR24 data as it's not QNH-dependent. At the quoted lift off time of 23:10:29 (per the report) the ADS-B data shows the 777 roughly abeam twy N4.