Guy's, I have noticed that particarly on descent or high speed climb out I get markedly increased noise accomapined by slight vibration. Is this to do with power setting (appears to correlate somewhat with higher rpm settings). Has anyon e experienced this phenomenon and would it be related to a natural harmonic for the aircraft?

Gerard,

 

Have you noticed aluminum dust streaks behind the outboard elevator hinges or, more likely in Australia,  extra wear on the outboard center-line hinges in the case of the MKII tail?

 

Anyone else?  I have this problem since using larger diameter hinge pins instead of teflon coated ones.