A320 Airframe VIB
I experienced quite a pronounced vibration enroute from LCA - STN last week.
There had been entries in the Tech Log for similar reports. The aorcraft had all the Ailerons, Rudder and Elevator rigging re-examined, all found within tolerance, gear bays doors were examined for excess play...nothing
I found that reducing from .79 using IAS rather than Mach No, when the speed/mach was equal to appprox 0.765 the vibration ceased. After approx. 3 -4 min at 0.76 accelerated to ECON, no vibration thereafter.
2 days later crews reporting the same vib...strange