Fuel – Distribution – Fuel Pressure Switch Missing Lockwire
Superseded. A newer version replaces this document.
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected BD-500-1A10 and BD-500-1A11 aircraft must perform a one-time inspection and corrective action on AC boost pump cartridge fuel pressure switches before 2450 flight hours from the AD effective date. Additionally, they must conduct initial and repetitive inspections and torquing of engine feed pressure switches every 935 flight hours. All actions must follow the specified Airbus Canada Service Bulletins.
Summary
Canadian Airworthiness Directive CF-2021-21 addresses a fuel system safety issue on Airbus Canada Limited Partnership aircraft models BD-500-1A10 and BD-500-1A11. The directive mandates inspections and corrective actions related to missing lockwire on fuel pressure switches installed on AC boost pump cartridges and engine feed pressure switches. This AD aims to prevent fuel leaks and potential fire hazards caused by loose fuel pressure switches.
What changed
Airworthiness Directive CF-2021-21 introduces mandatory visual inspections of torque identification stripes and torquing of fuel pressure switches if required, along with installation of lockwire on AC boost pump cartridges. It also requires repetitive inspections and torquing of engine feed pressure switches at specified intervals. These measures address the absence of a secondary locking feature on certain fuel pressure switches.
Why it matters
This directive is critical for aviation professionals to ensure the integrity of fuel system components and prevent fuel leaks that could lead to fire hazards. Operators and maintenance teams must comply to maintain aircraft airworthiness and safety. Failure to comply could result in unsafe conditions and regulatory non-compliance.
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New ADs and bulletins for Airbus BD-500 (A220 Series), Canada BD-500-1A10 and Canada BD-500-1A11, summarized like this page, every Monday.