VH-OQF ex DRS-SYD (18.5hr nonstop flight), then SYD-LAX (delayed) then LAX-SYD as QF18 returned to LAX after a significant delaySo after last night’s 5 hour delay out of SYD, the return was also delayed by 5 hours. And now has been returned back to LAX after circling and dumping fuel.
This isn’t an emergency descent. They aren‘t even trying. It’s just a normal descent profile. It also has a small level period at FL200. You don’t stop an emergency descent until you get to 10,000’ or the MSA.VH-OQF ex DRS-SYD (18.5hr nonstop flight), then SYD-LAX (delayed) then LAX-SYD as QF18 returned to LAX after a significant delay
Here is the altitude/speed profile:
The descent from FL300 to FL100 took 15 minutes.
If I recall correctly, the @jb747 QF30 emergency descent over MNL took 7 minutes for the same altitudes.
The speed you’re showing is the ground speed. The spike is associated with a turn that gives them a tailwind. The reduction in speed over the rest of the graph corresponds to the reduction that happens on all descents as the IAS and TAS slowly converge. The other bumps in speed are also associated with turns, as the aircraft holds off LA.It appeared that the aircraft turned around before making an altitude descent change. The “spike” in the speed is likely due to a turn into headwinds before a significant reduction in speed and altitude.
There’s nothing all that notable about the energy state. The only item of note is the the descent to about 6,000’ followed by a small climb to 8,000’. I wonder if the original plan was to land on 07R, with that later changing to 25L.would be interesting to find out what happened to cause the pilots to take so much kinetic and potential energy out of the aircraft.