Landing Gear — Main Landing Gear Side Brace Actuators Contain Non-Conforming Split Ball Bearing
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must verify the serial numbers of the left and right main landing gear side brace actuator assemblies according to Bombardier Service Bulletins 100-32-30 or 350-32-006. If the serial number is listed as affected, the split ball bearing must be replaced following the service bulletin instructions. Compliance must occur before accumulating 3750 total flight cycles or within 48 months for aircraft with 3350 or fewer cycles, or within 400 flight cycles or 12 months for those with more than 3350 cycles. Installation of affected actuators without bearing replacement is prohibited from the effective date.
Summary
Airworthiness Directive CF-2018-20 addresses a quality issue with the main landing gear side brace actuators on Bombardier BD-100-1A10 aircraft, specifically those equipped with split ball bearing part number 104467672. The directive requires verification and possible replacement of non-conforming split ball bearings to prevent asymmetric gear extension or retraction and potential gear collapse during landing. This directive applies to serial numbers 20003 through 20665 of the BD-100-1A10 model.
What changed
This new Airworthiness Directive introduces mandatory inspections of the serial numbers of main landing gear side brace actuator assemblies and requires replacement of split ball bearings if they are found to be non-conforming. It prohibits installation of affected actuators unless the split ball bearing has been replaced. The directive also provides specific compliance schedules based on aircraft flight cycles.
Why it matters
This directive is critical for aviation professionals to ensure the safety and airworthiness of Bombardier BD-100-1A10 aircraft by preventing landing gear failures caused by defective bearings. Operators and maintenance organizations must comply to avoid asymmetric gear operation and potential gear collapse, which could lead to accidents or costly repairs. Compliance teams must track affected serial numbers and ensure timely corrective actions to maintain regulatory compliance.
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