B738-smoke coming from maingear during rotation?

[danielk]

Hi!
I was watching a 738 takeoff this morning and just as they rotated i saw smoke coming from both mainlandinggears. I've never seen that happen before so it struck me as quite odd.
Any theories?

[Storminnorm]

Smoke? Are you sure? Wasn't spray from a wet run-way was it?

[leewan]

If it was on the ground, could be the spray from a wet runway or dust from the runway ? If it was in the air, could be the brakes being applied and the dust coming off.

[danielk]

No rain today. The runway was dry. It came off the tires just after they had rotated and the main gears were still on the tarmac.

[leewan]

What was the smoke's colour ? And where were you in relation to the a/c when the incident happened ?

[ampclamp]

No reason for a puff of smoke at that time in normal ops.
Could it have been a brief low pressure area creating water vapour such as seen of wing tips / flaps etc in more humid weather?

[rmm]

Brake dust can do it.

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