How much of the DG skin over the spar cap was delaminated? Sounds
like it doesn't do anything to the stiffness of the wing anyway.
If there is a 30% change between annuals and you can't find any
damage I'd suspect the test wasn't done properly at the previous
annual. Interesting to know how you propose to return the aircraft to service.
Alan, heavens you'll be wanting all rules and regulations to have a
sound, quantifiable, rational basis next.:-)
Mike
At 08:42 PM 12/1/2015, you wrote:
On 1/12/2015 8:16 PM, Alan wrote:
My question would be has the wing frequency test ever proved anything?
I'm aware of two cases where it has picked up significant structural
problems in a wing that were then found with more detailed
inspection. I know of another where the change was quite drastic
(30% change between annuals), but has been unable to identify the
cause to date and the aircraft is still grounded. There is also one
case where it didn't (Bathurst's DG300 that delaminated the spar
caps from the wing didn't pick up a freq change, but the tap test did).
--
Justin
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