AD/B737/203 - Pressure Fuelling System (Cth)

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 39.1 (1) of CAR 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/B737/203 Pressure Fuelling System 2/2003

Applicability: Model 737-600, -700, -700C, -800 and -900 series aeroplanes, as listed in Boeing Alert Service Bulletin (ASB) 737-28A1142, Revision 2, dated 26 November 2002.

Requirement: Replace the existing fuelling float switch and conduit assemblies in the main and centre fuel tanks with new, improved assemblies (includes a new float switch and a new conduit assembly with a liner system inside the conduit), in accordance with Work Packages I and II of the Accomplishment Instructions of Boeing ASB 737- 28A1142, Revision 2.

Replacements carried out before the effective date of this Directive in accordance with Boeing ASB 737-28A1142, dated 7 February 2002, are considered acceptable for compliance with this Directive.

Note 1: Due to the lack of sleeving on the existing electrical wire installations of the centre fuel tank, it is recommended that Work Package II be completed before Work Package I.

Note 2: FAA AD 2002-26-18 Amdt 39-13006 refers.

Compliance: For aeroplanes that have accumulated fewer than 5,000 total hours time in service (TIS) as of the effective date of this Directive - Within 2 years after the effective date of this Directive.