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. Boeing 737 Series Aeroplanes AD/B737/324 Forward and Aft Water Drain Masts 6/2008 Applicability: Model 737-600, -700, -700C, -800, and -900 series aircraft; as identified in Boeing Special Attention Service Bulletin 737-30-1056 Revision 1, or later FAA approved revision. Requirement: Action in accordance with the technical requirements of FAA AD 2008-08-22 Amdt 39-15476. Compliance: As specified in the Requirement document, with a revised effective date of 5 June 2008. This Airworthiness Directive becomes effective on 5 June 2008. Background: The FAA received a report of charred insulation blankets and burned wires around the forward grey water composite drain mast found during an inspection of the forward cargo compartment on a Model 767-300F aircraft. The actions required by this Directive are intended to prevent a fire near a composite drain mast and possible disruption of the electrical power system caused by a lightning strike on the composite drain mast. David Villiers Delegate of the Civil Aviation Safety Authority 23 April 2008