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Wed, Mar 17, 2010

FAA Issues SAIB For Cessna 336, 337 Wingtip Mods

Notice Follows Fatal Accident In New Jersey

The FAA has issued a Special Airworthiness Information Bulletin (SAIB) for the type of wingtip modification that separated from a Cessna 337 in Monmouth, New Jersey. The airplane went down, killing all five people aboard.

The SAIB is based on preliminary investigation findings from a fatal accident involving a Cessna Model T336G. The airplane experienced separation of a six-foot section of the outboard right wing. This airplane had been modified with an STC for extended wingtips. It also had an additional STC for winglets. For more information on the accident, see the NTSB preliminary report ERA10FA140.

The subsequent investigation revealed there have also been reports from the field of wrinkled skins, working rivets, cracks, and loose wing tips. The FAA notes that following service information has been issued:
Cessna Service Newsletter SNL06-6, FAA Approved Supplemental Type Certificates (STC’s) and FAA-PMA Approved Parts.
Aviation Enterprises Wing Extension Service Letter AE01-11-00.

After reviewing the above data, The FAA recommends you do the following:
Review and adhere to all published airspeed and maneuvering limitations for the modified airplane. Look for excessive “bowing” of the tip extensions in flight.
Perform a one-time general inspection of the wings for internal and external damage from Wing Station (WSTA) 23 to the wing tip within the next 100 hours time-in-service (TIS). Remove all wing access panels to conduct the inspection. Areas to focus on are listed below. Do this
inspection following the appropriate manufacture’s service information and any other appropriate guidance, such as FAA Advisory Circular AC 43.13-1B Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair.

Focused inspection items to focus on:
Wrinkles in upper wing skins.
Cracking of the upper wing skins. Pay particular attention to any wrinkles, the radius between stiffeners at Wing Station (WSTA) 150 (under fuel tank covers) and unreinforced access holes.
Smoking rivets at the rib near the inboard aileron hinge (WSTA 162).
Missing fastener hardware, particularly for attachment of the tips.
Excessive looseness of attachments of the tip extension to the wing and wing tip to wing extension when pushing up and down on the tip.
Any signs of distress along both front and rear spars.
Unusual repairs to the upper skins, particularly in the area of WSTA 150-162.

Since this is an on-going investigation, the FAA requests that if any damage if found, notify us at the address for the Atlanta Aircraft Certification Office listed below. Please include as much information as possible, including “N” number, model number, serial number, list of STC
modifications, TIS on aircraft and wing extension, physical description of damage (location, length, orientation, parts cracked, etc.), and if possible, pictures of the damage.

FMI: www.faa.gov


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