PPRuNe Forums

PPRuNe Forums (https://www.pprune.org/)
-   Rumours & News (https://www.pprune.org/rumours-news-13/)
-   -   Polar Cargo B748 at Tokyo 15 Jul, overran runway on takeoff (https://www.pprune.org/rumours-news/598200-polar-cargo-b748-tokyo-15-jul-overran-runway-takeoff.html)

parabellum 15th Aug 2017 05:34

Obviously some different theories abound, having flown the B747-400, 757-200 and 767-300ER, different companies, the rule was always the same, never reduce TO power below CLB power. I was comfortable with that! :)

White Knight 15th Aug 2017 05:41


Originally Posted by arw.ryder
It seems unwise and unnecessary to set takeoff power to less than climb. How do pilots justify this? Is it a case of blindly following formulas without putting thought in to what you're doing?

I don't fly Boeings but I can tell you that a full flex take off with the 380-800 gives about 62% Thrust and at 'Thrust Reduction' it will actually increase to a value based on the 'Derate Climb' selected in the FMS (EA engines). So we could easily get a 15 to 20% thrust increase for the climb.

As long as all performance requirements are met then it works for me:ok:

RandomPerson8008 15th Aug 2017 06:38

How about we wait for facts before condemning crews and entire airlines. Oh wait, I forgot for a second that this was pprune.

kungfu panda 15th Aug 2017 08:10

I would accept that under almost all other circumstances but when an Airline has as much history of occurences as Atlas/Polar the right to innocent before proved guilty is diminished. The management of this company clearly does not address the root causes of the safety issues they have. I am surprised that the Chinese with the Aviation standards they set allow this Airline into Shanghai.

Enos 16th Aug 2017 05:21


Originally Posted by parabellum (Post 9862200)
Obviously some different theories abound, having flown the B747-400, 757-200 and 767-300ER, different companies, the rule was always the same, never reduce TO power below CLB power. I was comfortable with that! :)

It can be down to what the operator pays Boeing for the derate 777-300ER can be 40% giving an assumed temperature of around 76deg, (aircraft virtually empty) but if you've got full thrust climb in the climb page at thrust reduction the thrust levers will go forward and give more thrust, weird to see. (Old SOP to always have full climb, days of expensive fuel)

The 777-200 F and LR with a max derate of 25% empty gives excessive exceleration (trend vector of 80kts) and higher than normal pitch attitudes after TO, great to get the power off at 1000ft if you don't fly these aircraft empty regularly.

Never saw it on the 75/76 never had the pleasure of the 747.

Cheers Enos

act700 18th Aug 2017 15:06


Originally Posted by kungfu panda (Post 9862320)
I would accept that under almost all other circumstances but when an Airline has as much history of occurences as Atlas/Polar the right to innocent before proved guilty is diminished. The management of this company clearly does not address the root causes of the safety issues they have. I am surprised that the Chinese with the Aviation standards they set allow this Airline into Shanghai.

HAHAHAHAHA....good one panda...I'm surprised with the high standards the Chinese themselves operate to, they're allowed out of China!!!


All times are GMT. The time now is 16:03.


Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.