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Comments on your comments:
On 2011-08-15, at 11:20 PM, Kent wrote: But a FYI about the Dynavibe, when I looked at them couple years ago, their vibration pickup had its cable integrated in one piece with the MEMS sensor. If misfortune caused a cable to burn after touching an exhaust pipe, one would have to send the whole cable and sensor back for repair or replacement, which I was told was "several hundred dollars".Dynavibe told me the sensor has not been returned for any failures. The cable I think must be kept clear of exhaust and prop and doors and should be tied down for the testing--just common sense. I did not see any abnormal risk. Another thing I wonder about, Dynavibe provides a calibration certificate but only after paying additional cost. You think they would check each unit after assembly? Two channels is also additional cost. The units are identical and meet the same standards out of the factory--from OSH reps I spoke with 2011.
Hartzell has instructions for dynamic balance too. Hartzell does not prohibit adjusting the shim static weights. Kent, I'm not an A&P or prop expert. However, I did reference the ACES materials in my research, that material is referenced in some FAA materials to use as a source for dynamic balance instructions. In that reference, ACES states "WARNING Static balance weight attached to the propeller hub by a certified propeller shop MUST NOT be removed." I personally looked at those weights and understand them to be static balance weights installed (in my case) by Hartzell factory and not adjustable. I came away with an understanding that the only adjustable dynamic weight change is to be installed elsewhere such as starter ring, spinner backplate, spinner screws but not by adjusting the factory static weights. I'd like your comments on this.Paul Calgary/Legacy |
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