Jsposaune From United States of America, joined Oct 2005, 291 posts, RR: 1 Reply 1, posted (6 years 9 months 2 weeks 16 hours ago) and read 9366 times:
Most likely brake dust... There was a thread on here not too long ago with a series of similar pictures.
There are no stupid questions....only stupid people!!!
Kaddyuk From Wallis and Futuna, joined Nov 2001, 4125 posts, RR: 29 Reply 5, posted (6 years 9 months 2 weeks 16 hours ago) and read 9299 times:
Quoting PipoA380 (Reply 4): Why would that brake dust come out at takeoff, would it be from the braking during the preceeding landing? Or during taxiing to the runway?
But the aircraft will have landed previous to the takeoff. It will come to a stop and move reasonably slowly preventing the dust to blow away.
The brake units wear by about 1 or 2 1/1000ths of an inch each time they're used. This can and does build up, eventually it blows off...
Whoever said "laughter is the best medicine" never had Gonorrhea
TK787 From United States of America, joined Jan 2006, 4102 posts, RR: 13 Reply 6, posted (6 years 9 months 2 weeks 16 hours ago) and read 9282 times:
Quoting PipoA380 (Reply 4): Thanks for raising that question TK787, as this is my photo, I'm wondering what it is!
Nice photo by the way. And what a nice way to meet a photographer.
I just didn't know if you visit the forums or not, so I posted it. Wouldn't want to step on your toes.
PipoA380 From Switzerland, joined May 2005, 1591 posts, RR: 52 Reply 7, posted (6 years 9 months 2 weeks 16 hours ago) and read 9282 times:
Quoting Kaddyuk (Reply 5): But the aircraft will have landed previous to the takeoff
Okay, that's what I meant with "would it be from the braking during the preceeding landing".
Quoting Kaddyuk (Reply 5): This can and does build up, eventually it blows off...
Okay, that explains why you don't see it every time. Thanks for these infos kaddyuk
Quoting TK787 (Reply 6): Nice photo by the way. And what a nice way to meet a photographer.
I just didn't know if you visit the forums or not, so I posted it. Wouldn't want to step on your toes.
Thanks for the comment. It's a complete coincidence by the way, the title seemed interesting, I was surprised to see my image Nice to meet you too!
Regards
Philippe
[Edited 2006-08-09 02:11:42]
It's not about AIRBUS. it's not about BOEING. It's all about the beauty of FLYING.
LH526 From Germany, joined Aug 2000, 2253 posts, RR: 17 Reply 9, posted (6 years 9 months 2 weeks 7 hours ago) and read 8942 times:
AIRLINERS.NET CREW FORUM MODERATOR
As covered, it's brake dust!
It's safer to have the wheels retracted after they have come to a complete stiop, hence some seconds before retracting the gear the wheels (wich still run at take off speed rotation) will be slowed down by the brakes to prevent rotatation in the wheel well.
Mario
LH526
Trittst im Morgenrot daher, seh ich dich im Strahlenmeer ...
Lufthansi From Germany, joined May 2002, 454 posts, RR: 2 Reply 10, posted (6 years 9 months 2 weeks 6 hours ago) and read 8895 times:
Try to take a bicyles wheel and hold in in your hand while it is turning. Now do the movement of the retracting landing gear. The gyro forces would put the whole aircraft in rotation/sideward movement. Gyro forces always react against the force you put in when "retracting" your bicycle wheel. Actio=reactio
This experiment is even more impressive when you sit on a moveable office chair with wheels. It will start to turn during your experiment as a reaction of your input force.
This is how the old standby horizons for i.e. A gyro remains it's axis' direction in a room. So the aircraft is turning around the stby. horizon. No imagine the aircraft to rotate around the landing gear...
Maybe someone finds a good physical site in English...
HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58 Reply 11, posted (6 years 9 months 2 weeks 5 hours ago) and read 8756 times:
Quoting LH526 (Reply 9): It's safer to have the wheels retracted after they have come to a complete stiop, hence some seconds before retracting the gear the wheels (wich still run at take off speed rotation) will be slowed down by the brakes to prevent rotatation in the wheel well.
Auto Retract Braking serves the Purpose.
regds
MEL
PipoA380 From Switzerland, joined May 2005, 1591 posts, RR: 52 Reply 13, posted (6 years 9 months 1 week 6 days 21 hours ago) and read 5701 times:
I got a mail from someone working at ATC in Amsterdam, here's the mail:
"Probably hot brakes...it is a long way to the runway. He was flying a long time with his gear down , when I asked him if he had any problems....he anwered ..."just hot brakes, keeping the gear down for cooling" That happened somewhere near the date this picture was made."
Excellent coincidence if it really was the same day!
Regards
Philippe
It's not about AIRBUS. it's not about BOEING. It's all about the beauty of FLYING.
AirFrance From United States of America, joined May 2006, 60 posts, RR: 1 Reply 15, posted (6 years 9 months 1 week 6 days 20 hours ago) and read 5148 times:
It is brake dust. Most maybe all planes have brake dust in the air after they takeoff from the runway.
Kaddyuk From Wallis and Futuna, joined Nov 2001, 4125 posts, RR: 29 Reply 16, posted (6 years 9 months 1 week 6 days 20 hours ago) and read 5060 times:
Quoting AirFrance (Reply 15): Most maybe all planes have brake dust in the air after they takeoff from the runway
Most certainly, however you need the right conditions to be able to see it
Whoever said "laughter is the best medicine" never had Gonorrhea
KC135R From United States of America, joined Apr 2005, 699 posts, RR: 5 Reply 17, posted (6 years 9 months 1 week 6 days 16 hours ago) and read 2668 times:
I seriously doubt that since it appears as if (judging by the nose gear doors) the gear is beginning the retraction sequence. If it is retracting, the braking that occurs automatically during retraction is the cause, as explained above by a couple of people.
On the planes I work, you can see it each and every time you watch one take off - just after the gear unlocks and begins moving the brakes auto-actuate and there's a puff of black smoke as the dust comes off.
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