747/777 minimum safe speed at MTOW below ten.
05-11-2020 | 01:57 AM
#11
New Hire
Joined: Mar 2009
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Happens everyday taking off 747-8f at mtow out of LAX to Asia. Often clean speed of 270-287. Normally we tell ATC as courtesy so they can plan, but they are more than used to it.
05-11-2020 | 05:09 AM
#13
Line Holder
Joined: Jul 2017
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Good answers here. I'd also add that interpretation of these requirements vary by region of the world. So it's pretty easy to request high speed in some parts of the world, while other places will have you maintain 250 knots regardless. This means in some parts of the world I'm dragging flaps 1 to 10k while other places I'll be clean and 270ish ASAP. People smarter than me can wade into which regions require what, when a reconfiguration of the airplane is required based on interpretations from chief counsel, etc.
05-11-2020 | 05:38 AM
#14
On Reserve
Joined: Mar 2014
Posts: 163
Likes: 1
From: F/O
No need to request “high speed” if it’s an operational requirement. You can do it as a courtesy, but that’s really all it is.
and no, ATC cannot give you greater than 250 if you just ask for it...
and no, ATC cannot give you greater than 250 if you just ask for it...
05-11-2020 | 06:45 AM
#17
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Joined: Sep 2017
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This discussion reminded me.......what speed can a 777 (ER or LR I guess) reach flying SE at MGTOW in the clean config with MCT set in level flight on a standard day at clean up altitude?
I'm guessing 280-300 KIAS, but is it even faster?
I'm guessing 280-300 KIAS, but is it even faster?
05-11-2020 | 07:24 AM
#18
Gets Weekends Off
Joined: Jul 2007
Posts: 4,065
Likes: 40
From: 767 Captain
Vmo if you don’t modulate your thrust. About 330 kias at sea level. The engines have ridiculous power. When they initially had the auto-rudder feature put in 100% of the required rudder on a V1 cut, there were crews that didn’t know they had lost an engine until they got airborne and cleaned up.
05-11-2020 | 07:29 AM
#19
Gets Weekends Off
Joined: Jan 2015
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There is no authorization request to exceed 250 when the minimum safe speed is above 250 however. The reg clearly authorizes exceeding the 250 limit without asking. So even if you ask the ATC they will only be only clarifying to you that you are already authorized by the regulating body. They themselves aren’t giving you permission as it was already given.
05-11-2020 | 07:32 AM
#20
Gets Weekends Off
Joined: Jul 2016
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747/777 minimum safe speed at MTOW below ten.
Not to speak for them but I think the insinuation is if it’s not due to operational necessity the ATC can’t authorize exceeding the 250 below 10. In other words a 737 can’t be authorized to go 280 below 10 just because they felt like it. That would imply the ATC has authority to give permission which they do not.
There is no authorization request to exceed 250 when the minimum safe speed is above 250 however. The reg clearly authorizes exceeding the 250 limit without asking. So even if you ask the ATC they will only be only clarifying to you that you are already authorized by the regulating body. They themselves aren’t giving you permission as it was already given.
There is no authorization request to exceed 250 when the minimum safe speed is above 250 however. The reg clearly authorizes exceeding the 250 limit without asking. So even if you ask the ATC they will only be only clarifying to you that you are already authorized by the regulating body. They themselves aren’t giving you permission as it was already given.
In America, correct.
Overseas and military, Ive has other experiences.
EDIT- added military which kinda goes off topic.
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