Summary
The FAA proposes to supersede an existing airworthiness directive (AD) that applies to certain BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ airplanes. The existing AD currently requires a one-time inspection to detect corrosion of the flap structure and machined ribs, corrective actions if necessary, and reprotection of the rib boss bores. This proposed AD would require a records review of the results of that inspection, and an additional inspection and related investigative/corrective action if necessary. This proposed AD results from the development of an improved inspection for corrosion in the subject area. We are proposing this AD to detect and correct corrosion in the flap structure and machined ribs, which could result in reduced structural integrity of the airplane.