2014-2014ACE072501 NAS577B7A

Suspected Unapproved Parts Details

Product
Multiple
Part name
Alcoa Fastening Systems Barrel Nuts
Part Number
NAS577B7A
Serial Number
5334992-000 (batch)

On July 25, 2014, the FAA issued Emergency AD (EAD) 2014-15-51, which requires inspection and replacement as necessary of the barrel nuts at the horizontal stabilizer to vertical stabilizer attachment joint on Embraer S.A. Model EMB-500 airplanes. This emergency AD was sent previously to all known U.S. owners and operators of these airplanes. After reviewing the available information and recognising that the FAA may not be the ‘State of Design’ authority for all the products (aircraft, engines, propellers), parts and appliances on which the affected nuts are used, EASA concurs with the UPN and the recommendations contained therein. This EAD results from a report of cracking in the barrel nuts at the horizontal stabilizer-to-vertical stabilizer attachment joint found during an inspection at the assembly line. This EAD is being issued to detect and correct cracking of the barrel nuts at the horizontal stabilizer-to-vertical stabilizer attachment joint, which could result in reduced structural integrity of the affected part and consequent detachment of the horizontal stabilizer from the airplane.
Since this condition may exist in other airplanes of the same type and affects flight safety, an immediate corrective action is required. Thus, sufficient reason exists to request compliance with this EAD in the indicated time limit without prior notice.”

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