New fasteners are cheaper than the labor to inspect and
clean old fasteners.




--
James H. Macklin
ATP,CFI,A&P

"C. Massey" wrote in message
. net...
|
| wrote in message
|
oups.com...
| You know what? I've been through this one so many times,
but it's been
| a few years, and I just don't have the energy to fight
this fight
| again.
|
| There is NO "torque-limiting" power screwdriver-type
tool that has both
| the ability to prevent over-tightening, and allow
sufficient "torque"
| to be applied to screws installed into aircraft
nutplates.
|
|
|
|
| But... a power screwdriver set below the specified torque
for a screw and
| then torqued by hand with a calibrated torque wrench set
to the proper
| setting will work just fine, or am I wrong?
|
| I believe that I am restating your paragraph below, but in
a way that my son
| or mother could read it.
|
|
|
|
|
| A slightly boogered screw or nutplate will NOT be
tightened
| sufficiently, or else other screws will be
over-tightened-there is NO
| middle ground.
|
|
|
| We were taught in A&P school not to reuse fasteners. I
doubt very seriously
| that this actually happens in the real world, but in the
schools perfect
| world, this should eleminate *most* of the "boogered"
fastener problems.
|
|
|
|
|
| In most cases, a quality torque-limiting screwdriver set
at minimal
| torque can be used by an experienced operator to run
screws and
| initially secure panels. The final "ginch" needs to be
performed by a
| human that knows what the **** he/she is doing.
|
| There is a large portion of the "certified technician"
population that
| isn't smart enuff to use the proper bit for the type of
screw to be
| r/r'd, let alone to use power to drive it. It's not much
of a stretch
| to say that this applies to owner-performed maintenance
also.
|
| TC
|
|
|
|
|
| ---
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