Service difficulty report · Nut

Difficulty date
November 28, 2012
Submitted
September 14, 2015
Operation
General aviation
Part
Nut
Condition
Mismanufactured
Stage of operation
IN
How discovered
9
Nature of condition
W
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) DURING INSTALLATION, THE NUTS FAILED TO HAVE SUFFICIENT RUN ON TORQUE. THE LOT WAS QUARRANTINED AND TESTED AGAINST THE MS21042 SPECIFICATION SHEET. THE MINIMUM WRENCHING TORQUE TEST VALUE FOR A -06 NUT IS 20" LB. 10 NUTS FROM LOT 510635 WERE RANDOMLY SELECTED AND THE RUN ON TORQUE MEASURED USING NEW AN-6 BOLTS. THE MAXIMUM TORQUE RECORDED WAS 5" LB AND SEVERAL WERE ABLE TO BE THREADED ON FULLY BY FINGER. THE SUPPLIER WAS NOTIFIED OF THE SUBSTANDARD PART AND LOT NUMBER.