Couldn't help but check AC 43.13-1A, though I don't have the latest
edition. In Chapter 5, Aircraft Hardware, 227.e. Torques
1. Calibrate the torque wrench periodically to assure accureacy; and
re-check frequently
2. Be sure that bolt and nut threads are clean and dry (unless otherwise
specified by the manufacturer.
3. Run nut down to near contact with the washer or bearing surface and
check "friction drag torque" required to turn the nut.
4. Add the friction drag torque to the desired torque recommended by the
manufacturer, or obtain desired torqued as shown in figure 5.2. This is
referred to as final torque which should register on the indicator or the
setting for a snapover type wrench.
5. Apply a smooth even pull when applying torque pressure. If chattering
or a jerking motion occurs during final torque, back off and re-torque.
6. When installing a castle nut, start alignment with the cotter pin hole
at mminimum recommended torque, plus friction drag. If the hole and nut
castellation do not aligh, change washers and try again. Exceeding the
maximum recommended torque is not recommended.
7. If torque is applied to capscrews or boltheads, apply recommended
torque plus friciton drag torque as determined in step (3).
8. If special adapters are used which will change the effect length of
the torque wrench, the final torque indiciation or wrench setting must be
adjusted accordingly. Determine the torque wrench indication or setting
with adapter installed as shown in figure 5.3. Figure 5.2 is a composite
chart or recommended torque to be used when specific torque is not
recommended by the manufacturer. The chart includes standard nut and
bolt combinations currently used in aviaion maintenance.
Well there it is from the FAA. Looks like the correct value is running
torque ("friction drag") plus desired torque recomended by manufacturer.
Terry
Rebel #666
On Sun, 30 Jan 2000 12:58:11 -0800 Dave Klimas <
drk@cts.com> writes:
Correct me if I am wrong, but shouldn't the final torque value be
from the torque tables for hardware in use plus the torque required
to move the elastic stop nut?
In regard to chromating bolts, no-one makes mention of chromating
the
threads of the bolt and nut. Tightening bolts without lubrication
can
reduce the final torque by up to 50% - no-one makes any mention of
lubricating the AN365 elastic-stop nuts (chromate or lubricant?) to
end
up with the proper torque.
Anyone have any comments on that?
Peter Kopasovic
SR003
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