Originally Posted by
MarkerInbound
Transport aircraft rarely use their full thrust for takeoff. To save wear and tear on the the aircraft a takeoff thrust setting is computed to just meet the performance requirements. At structural weight with a long runway there is often a large reduction in the takeoff thrust setting because full thrust wasn't needed.
Indeed that would have been the case with a full length departure off RWY09.
However, they departed from RWY09 intersection T1. Leaving a TODA of ~2600m/8500ft in which case with APU to Pack, and TOGA, under the prevailing conditions would have allowed for ~325,000kgs. A good 25,000kgs under MTOW and QR778 is consistently going out near/at MTOW.
Im going to say they calculated full length RWY09 with ~3900m TODA available. And ended up taking off with from T1 (fact) ~2600m of pavement available.