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AD/B747/212 Amdt 1 - Modular Avionics Warning Electronic Assembly
Boeing 747 Series AeroplanesBoeing 747 Series Aeroplanes
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Boeing 747 Series Aeroplanes
| AD/B747/212 Amdt 1 | Modular Avionics Warning Electronic Assembly | 8/2009 |
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| 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. |
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| 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 285T0035-202Mod 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 SB747-31-2288, 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/N285T0035-9, 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. |
| 4. MAWEA power supply P/N 285T0035-201 may not be installed on any aeroplane as a replacement part. |
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