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Safety Action

Summary

As a result of this occurrence and the subsequent discovery of two other aircraft found to have sustained similar structural deterioration due to moisture ingress, the aircraft manufacturer issued Service Bulletin No 24 on 27 February 1998. This Service Bulletin required an immediate inspection of the aileron hanger ribs of factory-built aircraft which had accumulated more than 300 flight hours or were more than 12 months old. The Civil Aviation Safety Authority issued Airworthiness Directive AD/CA25/7 requiring inspection in accordance with the manufacturer's service bulletin by 3 March 1998 or before further flight.

 
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