AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section. BAe Systems (Operations) Jetstream 4100 Series Aeroplanes AD/J4100/20 Passenger Cabin Seat Rails 4/2008 DM Applicability: All Model Jetstream Series 4100 aircraft. Requirement: Action in accordance with BAE Systems Mandatory Service Bulletin J41-53-050 Revision 1, or later CAA/EASA approved revision. Note: UK CAA AD 005-01-2002 refers. Compliance: Unless the initial inspection is already accomplished, within 30 days after 20 February 2008. Inspect thereafter at intervals not to exceed 2 years. This Airworthiness Directive becomes effective on 20 February 2008. Background: Corrosion found on the passenger cabin seat rails has been attributed to fluid spillage and collection of debris inside the seat rail track. A dedicated inspection is required to maintain structural integrity. David Villiers Delegate of the Civil Aviation Safety Authority 15 February 2008