Flight Controls — Multi-Function Spoiler (MFS) Failure to deploy
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect all four MFS PCUs installed on affected BD-100-1A10 aircraft within 12 months from August 18, 2020, using the specified service bulletins. If any affected PCUs are found, they must be replaced within the same 12-month period. Additionally, no affected MFS PCUs may be installed on these aircraft after the directive's effective date.
Summary
The Canadian Airworthiness Directive CF-2020-26 addresses a failure issue with the Multi-Function Spoiler (MFS) on Bombardier Inc. BD-100-1A10 aircraft, specifically serial numbers 20003 through 20457 and 20501 through 22999. It mandates inspection and replacement of affected MFS Power Control Units (PCUs) to ensure proper deployment and maintain proportional lift dumping functionality. This directive aims to prevent potential structural damage and passenger injury caused by degraded spoiler performance during emergency descents.
What changed
CF-2020-26 introduces mandatory inspections of the MFS PCUs within 12 months of the effective date and requires replacement of any affected units that do not meet the specified serial number criteria. It also prohibits installation of affected MFS PCUs on the specified Bombardier BD-100-1A10 aircraft models from the effective date onward. The directive specifies applicable service bulletins for compliance procedures.
Why it matters
This directive is critical for operators and maintenance organizations to ensure the reliability of the flight control system, particularly the Multi-Function Spoilers that contribute to safe emergency descents. Failure to comply could result in compromised aircraft performance during sudden cabin depressurization, increasing risk of structural damage and passenger injury. Compliance teams must track affected serial numbers and ensure timely inspections and replacements to maintain airworthiness.
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- EASA AD CF-2025-42Flight Controls — Horizontal Stabilizer — Autopilot Inability to Trim Horizontal StabilizerAug 28, 2025
- EASA SIB CASA-2025-03Flight Controls — Unannunciated Loss of Ground Lift Dump Spoilers due to Faulty Throttle Quadrant AssemblyApr 9, 2025
- EASA AD CF-2024-38Flight Controls — Horizontal Stabilizer Trim Actuator (HSTA) — Incomplete OverhaulNov 15, 2024
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