Ok, so the original premise of this thread was wrong, it turns out there is apparently a 3,000 ft AFE takeoff thrust limit per ICAO noise abatement procedures? At least this is according to my airline’s technical authorities. Can anyone point me to a reference for this? The closest I can find are statements such as:
“(6) Maintain the speed and thrust criteria as described in subparagraph 6 b(3) through 6 b(5) to 3,000 feet AFF or above, or until the airplane has been fully transitioned to the en route climb configuration (whichever occurs first), then transition to normal en route climb procedure”
It is coming up in HKG on the NADP-2 runways there, after the new SID’s were constructed in 2024 that have speed limits requiring takeoff flap settings to remain in place until ~6000 ft AFE at heavy weights. Normally the reduction to climb thrust happens at flaps 5 on NADP-2 (B-747 with flaps 10 or 20 takeoff settings) but we are now being instructed to manually reduce thrust at 3,000. This is being mandated irrespective of the 5 minute takeoff thrust limitation.
Last edited by RandomPerson8008; 23rd January 2026 at 21:00.