Airworthiness DirectiveSupersededEASA AD CF-2020-54R1

Landing Gear – Main Landing Gear (MLG) Shock Strut Lower Pin Cracking

Superseded. A newer version replaces this document.

Published: Dec 28, 2020
Effective: Jan 5, 2021
Deadline: Jan 5, 2021
Replaces: 2020-54

Bombardier CL-600 (Challenger)

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators of affected Bombardier CL-600-2B16 aircraft must perform initial and repetitive lubrication of the MLG shock strut lower pin at intervals not exceeding 200 flight hours or 12 months. Detailed visual inspections must be conducted before specified flight cycle thresholds and repeated every 400 flight hours or 24 months unless superseded by non-destructive testing, which must be performed initially and repeated every 900 flight cycles. Any detected cracks or damage require immediate replacement of the pin before further flight.

Summary

Canadian Airworthiness Directive CF-2020-54R1 addresses cracking issues in the main landing gear (MLG) shock strut lower pin, part number 19146-3, on Bombardier Inc. model CL-600-2B16 aircraft with specified serial numbers. The directive mandates repetitive lubrication, detailed visual inspections, and non-destructive testing of the affected pins to detect and prevent structural failure. It applies to various CL-600-2B16 variants including CL-604, CL-605, and CL-650 models.

What changed

AD CF-2020-54R1 revises the previous AD CF-2020-54 by correcting a typographical error in the effective date. It continues to require initial and repetitive lubrication, detailed visual inspections, and non-destructive testing of the MLG shock strut lower pin, with replacement mandated if cracks or damage are found. The revision clarifies compliance timelines and inspection intervals based on flight cycles and hours.

Why it matters

This directive is critical for aviation professionals to prevent potential structural failure of the main landing gear due to pin cracking, which could compromise aircraft safety during takeoff and landing. Operators and maintenance organizations must adhere to the inspection and lubrication schedules to ensure continued airworthiness and regulatory compliance. Failure to comply could lead to grounding of aircraft and increased maintenance costs.

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