Landing Gear — Main Landing Gear Side Stay Actuators Contain Non-Conforming Split Ball Bearing
- Published
- Effective
- Deadline
- Replaces
- 2018-26
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 stay actuator assemblies using the specified Service Bulletins and tables. If the serial number is listed as affected, the split ball bearing Part Number 104467672 must be replaced according to the Service Bulletin instructions. Compliance must be achieved before the bearing reaches 3750 flight cycles or within 48 months from the original AD effective date, or within 400 flight cycles or 12 months if the bearing has already exceeded 3350 flight cycles.
Summary
The Canadian Airworthiness Directive CF-2018-26R1 addresses an issue with Bombardier Inc. CL-600-2B16 aircraft, serial numbers 5301 through 5665, 5701 through 5988, and 6050 through 6091, equipped with split ball bearing Part Number 104467672 in the main landing gear side stay actuators. This directive mandates verification and possible replacement of non-conforming split ball bearings to prevent asymmetric landing gear extension or retraction that could lead to gear collapse during landing.
What changed
CF-2018-26R1 revises the original AD CF-2018-26 by adding references to Table 2 in the applicable Service Bulletins, which list affected serial numbers for part number 19011-105. It clarifies the serial number verification process and updates compliance requirements for replacement of the split ball bearings in the main landing gear side stay actuators.
Why it matters
This directive is critical for aviation professionals because non-conforming split ball bearings in the main landing gear side stay actuators can cause asymmetric gear operation and potential gear collapse, posing a serious safety risk. Operators, maintenance organizations, and compliance teams must ensure affected parts are identified and replaced promptly to maintain airworthiness and regulatory compliance.
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