Airworthiness DirectiveSupersededEASA AD CF-2022-14

Landing Gear – Introduction of New Brake Accumulator Life Limit

Superseded. A newer version replaces this document.

Published: Apr 8, 2022
Effective: Apr 14, 2022
Deadline: Apr 14, 2022

Bombardier BD-700 1A10

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What to do

Operators must amend their Transport Canada approved maintenance schedules within 90 days of the effective date to include the new brake accumulator life limits and discard tasks. They must also determine the number of accumulated landings on the affected brake accumulators using the specified Bombardier Service Bulletins. Initial compliance with life limits must occur before the accumulators reach their limits or within six months from the effective date, with ongoing replacements before exceeding these limits.

Summary

Canadian Airworthiness Directive CF-2022-14 introduces new brake accumulator life limits for Bombardier BD-700-1A10 and BD-700-1A11 aircraft, specifically serial numbers 9002 through 9998 and 60001 through 60046. This directive mandates updates to maintenance schedules to incorporate these life limits for specific brake accumulator part numbers GW415-1250-1 and GW415-1200 series. It aims to prevent brake accumulator failures that could lead to loss of hydraulic pressure and reduced braking capability.

What changed

This Airworthiness Directive establishes mandatory life limits for the No. 2 and No. 3 brake accumulators on affected Bombardier BD-700 aircraft models. It requires operators to amend their approved maintenance schedules to include discard tasks for these accumulators and to determine the accumulated landings on installed units according to Bombardier Service Bulletins. The directive also sets initial and ongoing replacement requirements based on these life limits.

Why it matters

The directive is critical for maintaining safe braking performance on the main landing gear by preventing failures of brake accumulators due to exceeding their service life. Compliance ensures continued airworthiness and reduces the risk of runway excursions caused by loss of hydraulic pressure in braking systems. Operators, maintenance organizations, and compliance teams must integrate these new life limits to avoid operational disruptions and regulatory non-compliance.

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