Squawk Box

November 2007 Issue

Fretting And Chafing

During an annual inspection, the IA found black fretting corrosion below the center two, l/h aft engine mount bolts. The bolts were loose in the mount even though their nuts were tight. Investigation revealed the bolts are a little too long and the nuts were running out of threads. The solution was to add another washer below the nuts, then re-torque back to specifications.

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