CFM56-5B vs 7B reverse idle.

[TotalBeginner]

I've noticed on the A320 family, that when idle reverse is selected after touch-down, there is a very brief increase in thrust before the engine settles at flight idle. This doesn't seem to happen on the 737NG.

What is the reason for this?

[Fullblast]

It does happen on the 737NG as well; normally up to 43/45% N1 then below 40%. Don't know the reason but I guess is something to do with the inertia of the airflow changing direction rapidly.

[DevX]

Bleeds operating transiently perhaps?

[tdracer]

On most Boeings, there is a five second time delay on touchdown before going from approach idle to ground idle. Depending on how quickly you get the reversers deployed, you may be seeing that transition...

[TotalBeginner]

You can hear it in this video.

easyJet Landing Madrid Barajas A319 - YouTube (http://youtu.be/8MkfLDzu4Pk)