Summary
We propose to adopt a new airworthiness directive (AD) for the products listed above that would supersede 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: In 1991, the UK Civil Aviation Authority (CAA) issued AD 015-08-91 [which corresponds to FAA AD 93-01- 11], requiring the accomplishment of inspections of, and in case of crack findings, corrective actions on, the wing top skin at rib `0' of pre-modification HCM00851C BAe 146 series aircraft in accordance with British Aerospace Service Bulletin (SB) 57-41 dated 26 July 1991. Recently, BAE Systems (Operations) Ltd has determined that a revised inspection programme for the wing top skin and joint strap at rib `0' on all BAe 146 and AVRO 146-RJ aircraft is necessary to assure the continued structural integrity ofthis area. Cracking of the wing centre section top skin, if undetected, could lead to structural failure and consequent loss of the aircraft. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.