You ask a very relevant question, Kathy. It's a subject that has concerned
me frequently in different places, and we've gotten around it this way:

1. You ensure that your torque wrench is calibrated and adjusted to the
correct torque for the job. It is then locked so that it cannot be easily
changed.
2. The setting is verified by a QA chap/chapess before the job begins.
3. Another wrench, also calibrated, is set to a figure slightly lower than
that of the wrench used to do the tightening (slightly = nominal tightness
figure minus four times the tightening tolerence (an arbitrary formula of
my own, that leaves a small but defininte gap between the tightness figure
and the testing figure)). I use four times the tolerence where I once used
three, to allow for tolerence in the calibration testing and to reduce
further the risk of loosening correctly tightened fasteners. Using this,
only loose fasteners should come undone.

If any do come undone, and Loctite is involved, they have to be completely
removed, of course, to be re-loctited and re-torqued.

Peter



Kathy Kuhlow <[log in to unmask]>    06/09/2002 01:03 AM
Sent by: TechNet <[log in to unmask]>

Please respond to "TechNet E-Mail Forum."; Please respond to Kathy Kuhlow

              To:  [log in to unmask]
              cc:  (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
              Subject: [TN] Torque Inspections








I was curious how are torque requirements for hardware are being confirmed?
If a particular piece of hardware has a torque requirement of 12in/lbs how
would the verification of that piece of hardware be done?  Do you use a
torque driver at the same in/lbs or back off of the torque range or look
for loose(gap only)?

TIA
Kat

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