This SAIB alerts owners/operators of potential corrosion on the vertical stabilizer forward attach point as a result of service data reports. This also provides our reminder to focus on the aircraft service manual (SM) as mitigating action. Affected part numbers are 62453-00 (steel fitting) and 62444-xx (aluminum bulkhead/frame assembly). There were four occurrences found during routine maintenance over a 21-year period, with an average in-service time of 2,160 hours. Due to similarity of design, the PA-32 is also susceptible to this corrosion. The service manuals for the PA-28, PA-32, and PA-34 provide specific inspection instructions.
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