Runway deceleration?
 

On EI A319 from LHR yesterday. Twice during take off roll the a/c decelarated briefly. We eventually took off normally albeit towards end of runway...
I'm curious as to what may have caused this?

Runway deceleration?
 

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Thanks Radix. It was not especially windy. But thunderstorm activity in the area earlier.
And yes you are right it was brief loss of acceleration rather than deceleration.

Was the aircraft full? Either way it would be relatively light due to short sector length and operating off a very long runway so the power would have most likely been de-rated making the perception of acceleration changes greater.

Rest assured there would have been plenty of extra power available if required!

"would have most likely been de-rated making the perception of acceleration changes greater." - ??????

Maybe it was a learner pilot having problems with the clutch whilst changing gears...

I'm sure Aer Lingus ABs are all automatic gearboxes, are they not?

Lack of traction from the driving wheels? Maybe a slick runway? :rolleyes:

Blocked Carburettors and diesel - never changes

Well, if they WILL buy their fuel from Tesco ...? :=

Runway deceleration?
 

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Radix - you'll be OK - it was an AB319. The 787 has electric motors, I think, so no clutch?

Maybe the conveyor belt bearings are worn out.

Being reminded that it was a 319, I realised the REAL reason - the pilots got distracted by the barking dog. :eek:

dochealth Thank you for giving such an opportunity for diversion from the main flight plan (terrible pun intended) please don't take it personally!


Further suggestions are welcome.

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Hit a puddle!

Runway deceleration?
 

The runway is a bit rough and it was the pilot's foot bouncing off the accelerator pedal briefly.

I'm not a pilot nor have a great understanding of a/c flight systems. I always presumed commercial jets had leavers, when pushed forward the thrust would increase. I never knew some AB models have accelerator/thrust pedals.

I have one concern about the thrust pedal, on a long flight does the pilot have to keep pressure on the pedal as one does when driving a car?

No, there's a cruise control for that.