AD/DHC-8/138 Fuel System Safety (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.
Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes
| AD/DHC-8/138 | Fuel System Safety | 4/2008 DM |
Applicability: | DHC-8-400, DHC-8-401 and DHC-8-402 model aeroplanes. |
Requirement: | To ensure management and control of Critical Design Configuration Control Limitations (CDCCL) items, each operator must: |
| a. Amend their copies of DHC-8-400 Maintenance Requirements Manual, | |
| b. Amend any of their DHC-8-400 Series aircraft related procedures and documentation to highlight the existence of CDCCL items noted above and to highlight the necessary requirements to maintain the design features of those CDCCL items. | |
| Note 1: Maintenance Requirements Manual TRs introduced by this Directive may be removed from the manual when the TR is cancelled or superseded by either a further TR or later normal revision to the manual. | |
| Note 2: Transport Canada AD CF-2008-06 refers. | |
Compliance: | Within 60 days after the effective date of this Directive. |
| This Airworthiness Directive becomes effective on 22 February 2008. | |
Background: | Bombardier Aerospace has completed a system safety review of the aircraft fuel system against fuel tank safety standards introduced in Chapter 525 of the Airworthiness Manual through Notice of Proposed Amendment (NPA) 2002-043. The identified non-compliances were then assessed using Transport Canada Policy Letter No. 525-001, to determine if mandatory corrective action is required. |
| The assessment showed that it is necessary to introduce CDCCL, in order to preserve critical fuel tank system ignition source prevention features during configuration changes such as modifications and repairs, or during maintenance actions. Failure to preserve critical fuel tank system ignition source prevention features could result in a fuel tank explosion. Revisions have been made to Part 2 “Airworthiness Limitations List” of the Maintenance Requirements Manual of the affected aircraft models to introduce the required CDCCL. |
David Punshon
Delegate of the Civil Aviation Safety Authority
14 February 2008
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