EASA AD CF-2024-29
SUPERSEDED BY TCCA AD CF-2024-34
Summary
Canadian Airworthiness Directive CF-2024-29 is an emergency directive issued by Transport Canada Civil Aviation affecting Airbus Canada Limited Partnership aeroplanes Model BD-500-1A10 (serial numbers 50010 through 50047) and Model BD-500-1A11 (serial numbers 55003 through 55070). It addresses the risk of chafing and damage to the Variable Frequency Generator (VFG) power-feeder harnesses, which can lead to generator failure and loss of critical aircraft systems. This directive prohibits dispatching affected aircraft under certain Master Minimum Equipment List (MMEL) items to mitigate safety risks.
What Changed
This new directive introduces a prohibition on dispatching affected Airbus Canada BD-500-1A10 and BD-500-1A11 aeroplanes under specific MMEL items related to the VFG systems and Auxiliary Power Unit (APU) systems. It identifies a new risk of harness chafing caused by the implementation of Part C of ACLP Service Bulletin BD500-534101 Issues 005 through 008, which may cause unsupported harness lengths leading to damage. The directive is interim and does not change previous AD CF-2023-24 requirements but adds operational restrictions to reduce risk.
Why It Matters
This directive is critical for operators and maintenance organizations as it addresses a newly identified safety risk that could result in loss of electrical power from the main generators, potentially compromising aircraft safety. Compliance ensures that aircraft are not dispatched with certain inoperative systems that could exacerbate the risk of generator failure. It also informs compliance teams of new operational restrictions and the need to monitor further AD actions that may follow.
What To Do
Operators of affected Airbus Canada BD-500-1A10 and BD-500-1A11 aeroplanes must immediately comply with the prohibition against dispatching aircraft under the specified MMEL items related to VFG and APU systems. They should review aircraft maintenance records to identify incorporation of Part C of ACLP SB BD500-534101 Issues 005 to 008 and adjust dispatch procedures accordingly. Contact Transport Canada Civil Aviation for further guidance and monitor for any subsequent directives.