Document ID: chunk:federal_register_of_legislation:F2006B03461:reg:3505
Version: federal_register_of_legislation:F2006B03461
Segment Type: reg
Provision Reference: reg 3505
Character Range: 1400–2956

3505            3665            3858 to 3861    4099 to 4104
3518 to 3521    3672            3901            4137
3528 to 3531    3673            3902            4138
3544 to 3547    3686            3912 to 3915

            Requirement: Determine the part number and serial number of the DBI in accordance with BAE Systems (Operations) Service Bulletin SB 34-371-70671A dated 19 September 2003. If the DBI is found to be one of those identified in the above Applicability Statement, remove the DBI from the aeroplane and replace it with a modified Thales DBI P/N 63543-280-2 or a DBI P/N 63543-280-1, whose serial number is not listed in the Applicability Statement, in accordance with SB 34-371-70671A.

            Note: CAA(UK) AD G-2004-0006 refers.

 Compliance: Within four calendar months after the effective date of this Directive.

            This Airworthiness Directive becomes effective on 13 May 2004.

 British Aerospace BAe 146 Series Aeroplanes

 AD/BAe 146/109 (continued)

            Background: A manufacturing fault with the DBI PSU transformer could result in the propagation of the aircraft 115VAC input power supply through the instrument onto the DBI ARINC 429 Input/Output interfaces. An analysis of this failure concluded that at the aircraft level the failure effect could be loss of all aircraft primary navigation instruments.

 James Coyne
 Delegate of the Civil Aviation Safety Authority 1 April 2004

 The above AD is notified in the Commonwealth of Australia Gazette on 21 April 2004.