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AIRWORTHINESS DIRECTIVE

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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 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.

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British Aerospace BAe 146 Series Aeroplanes

 

AD/BAe 146/109 Thales Avionics Distance Bearing Indicator

5/2004

 

 

Applicability: Model Avro 146-RJ Series RJ70, RJ85 and RJ100 aeroplanes fitted with Thales Avionics Distance Bearing Indicator (DBI) part number (P/N) 63543-280-1 with the following serial numbers:

 

 

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.

Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.

James Coyne

Delegate of the Civil Aviation Safety Authority 1 April 2004

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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