willie.harrison(at)tinyon
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 Posted: Wed Jun 20, 2007 9:17 am Post subject: torque tube backlash specs |
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Dear All
Can anyone tell me why finite backlash is permitted between the TR4 torque tube and the TP12 drive flanges, but none is permitted between the mass balance assembly and the torque tube?
Surely backlash anywhere in the chain between the mass balance and the tailplanes is equally undesirable from a flutter viewpoint? Or, looked at from the other way, if there is a finite amount of backlash allowable consistent with anti flutter behaviour, then why can this not be distributed as a "backlash budget" amongst all the links in the chain?
Have I missed something? Because if not, I suspect an awful lot of UK Europas are going to get grounded pending what may be an unnecessary and painful "repair" to the TP9 horn attachment. (In all the circumstances, don't expect any flexibility from your inspector in interpreting the document...)
Incidentally, the 1/2" drive flange backlash, (measured at the tailplane trailing edges), as specified in the Safety Bulletin, is a lot more than the 3/16" limit which I recall being told by Europa 3 years ago. Can anyone shed light on that?
Willie Harrison
On 20 Jun 2007, at 16:58, Mike Gregory wrote:
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To all Listers
Please see the updated safety bulletin on the PFA web site – see link below.
Mike
Europa Club Safety Officer
EUROPA SAFETY ALERT UPDATE!
EUROPA SAFETY BULLETIN RAISED TO ISSUE 2 TO INCLUDE FURTHER GUIDANCE ON ACCEPTANCE DESIGNS OF PIP-PIN RECESSES IN TAILPLANES.
Europa Flight Safety Bulletin 006
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