AD/B737/349 - Windshield Wiper Motors (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 39.001(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/B737/349 Windshield Wiper Motors 1/2009

Applicability: Model 737 aeroplanes as follows: Model 737-400 and -500 series aeroplanes as identified in Boeing Alert Service Bulletin (ASB) 737-30A1059, dated 10 September 2007. Model 737-600, -700, -700C, -800 and -900 series aeroplanes as identified in Boeing Service Bulletin (SB) 737-30A1057, Revision 1, dated 31 October 2007. Requirement: 1. Inspect to determine the part number and serial number of the windshield wiper motors for the pilot's and first officer's windshields, and do all applicable corrective actions, by accomplishing all of the applicable actions specified in the Accomplishment Instructions of ASB 737-30A1059, (for Model 737-400 and -500 series aeroplanes); or SB 737-30A1057, Revision 1 (for Model 737-600, -700, -700C, -800 and -900 series aeroplanes); as applicable. A review of aeroplane maintenance records is acceptable in lieu of the Requirement 1 inspection if the part number and serial number of the windshield wiper motors can be conclusively determined from that review. Following the inspection or records review, as applicable, for any windshield wiper motor that is found not to be affected by the requirements of this Directive, re-identifying the part number is not required. Note 1: ASB 737-30A1059 and SB 737-30A1057, Revision 1, refer to Rosemount Aerospace SB 2313M-347/2313M-348-30-01, dated 30 June 2006, as an additional source of service information for determining whether the windshield wiper motor (identified in the Rosemount SB as the "power module'') has been previously replaced and for changing the part number. Note 2: Appendix A of SB 2313M-347/2313M-348-30-01 identifies an incorrect serial number for Model Number 2313M-348-3. Serial number M252 should be M0252. Note 3: SB 2313M-347/2313M- 348-30-01 specifies marking affected parts with an approved opaque material per BAC5307, classification RO, with an approved permanent marking material; however, for the purposes of this Directive, any permanent method of part marking is acceptable.