Safety - When should PAX alert crew
I was recently traveling from LTN to MXP on easyjet A319. i fly this route regular and i am quite familiar with this aircraft,
On taxiway i became aware of an unusual noise after the 'squeaking' sound of the hydraulics. Other passengers looked concerned. The sound continued for several mins, i decided to alert the crew, other passenger said it was not necessary as the crew would hear it also. i did alert the crew who didn't initially respond to my "Call Button' even though at this stage we hadn't arrived at the runway. Then a member of the crew did come and ask if i was concerned about the noise, and not to worry as it's normal but "we cannot hear it at the front". If they cannot hear it and it had stopped then how do they know what it was?
Was i correct to alert the crew as it's not helpful to make this observation at 35,000 Ft when in the unlikely event a hydraulic problem has occured.
I would like to hear a professional opinion about passenger comments and observation.