Originally Posted by
oicur12.again
However, our QRH reads thus:
Trailing Edge Flap Asymmetry
Note: If there is no longer any indication of the flap asymmetry indication after the flap lever is reset in step 1 below, normal flap operation has likely been restored. The crew may stop the NNC and return to normal procedures.
NG or classic?
This is a company specific note. On the NG flaps are protected through the FSEU system (includes skew protection), on the classic it is simply a comparator.
On the classic there are known cases in which one of the 2 needles gets stuck inside the indicator and this blocks the extension of the flaps. It looks like an assymetry but it’s not. Putting the handle up might deblock the needle and resolve the problem... or it might not. We used to tap the indicator, but you might have to wait for touchdown to ’kick’ the indicator out of friction zone and then prepare for a battle with maintenance about your eyes 😀. Ah yes, flaps and slats on the 737... always fun.