Summary
We propose to adopt a new airworthiness directive (AD) for the products listed above that would revise an existing AD. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: Inspection of a high time aircraft has revealed cracks in the Horizontal Stabilizer rear spar splice plate and inboard main ribs around the area of the Horizontal Stabilizer rear pivot attachment. Additionally, failure of some attach bolts in service may be due to improper assembly. This amendment is issued to include an applicability matrix (Table 1, page 2) in the compliance section of the service bulletin for improved clarity. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.