AD/B747/212 Amdt 1 - Modular Avionics Warning Electronic Assembly (Cth)

AIRWORTHINESS DIRECTIVE On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B747/212 and issues the following 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 747 Series Aeroplanes AD/B747/212 Amdt 1 Modular Avionics Warning Electronic Assembly 8/2009

Applicability: Model 747-400 and 747-400F series aeroplanes equipped with a modular avionics warning electronic assembly (MAWEA) power supply Part Number (P/N) 285T0035-201. Requirement: 1. Check the status page of the engine indication and crew alerting system (EICAS) for any MAWEA failure. 2. If any failure of the MAWEA or the loss of any visual, aural, or tactile alert is detected during any Requirement 1 check replace the power supplies of the MAWEA with new or modified power supplies having P/N 285T0035-202 Mod A, in accordance with either Boeing Service Bulletin (SB) 747-31-2288, dated 17 December 1998, or Revision 1, dated 28 January 1999; or with new, modified, or serviceable power supplies having P/N 285T0035-202 Mod A, P/N 285T0035-10, or P/N 285T0035-11, in accordance with Boeing SB 747-31-2288, Revision 2, dated 18 November 1999. Note 1: Page 59 of Boeing Service Bulletin 747-31-2288, Revision 1, incorrectly references the Boeing 767 AMM as the appropriate source of service information for accomplishment of the removal and installation of the power supply. However, the correct reference is the Boeing 747 AMM. Note 2: Boeing Component Service Bulletin 285T0035-31-07, dated December 17, 1998, describes procedures for modifying MAWEA power supplies having P/N 28T0035-201 to 285T0035-202 Mod A. 3. If not already accomplished, replace MAWEA power supplies having P/N 285T0035-201, with new or modified power supplies having P/N 285T0035-202 Mod A; or new, modified, or serviceable power supplies having P/N 285T0035-9, P/N 285T0035-10, or P/N 285T0035-11, in accordance with SB 747-31-2288, or Revision 1, or Revision 2. After the effective date of this Directive only SB 747-31-2288 Revision 2 may be used to accomplish MAEWA power supply replacement unless later revisions of the SB have been approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to the equivalent Requirements of FAA AD 2001-11-08.