EASA AD CF-2021-33
Flight Controls — Rudder Control System — Inspection for Missing Crimping of Rudder Power Control Unit Load Limiter
Summary
Canadian Airworthiness Directive CF-2021-33 addresses the inspection and replacement of rudder power control unit (PCU) load limiters on Bombardier CL-600 series aircraft, including models CL-600-1A11, CL-600-2A12, and CL-600-2B16. The directive targets specific serial number ranges and part numbers 600-91302-43 and 600-91302-53 to ensure the integrity of the rudder control system. It mandates visual inspections and functional testing to detect missing crimping on the load limiter end caps, which could impair rudder control.
What Changed
This new Airworthiness Directive introduces mandatory inspections and testing procedures for the rudder PCU load limiters on affected Bombardier aircraft. It requires operators to perform one-time or repeated inspections depending on the aircraft model and serial number, followed by replacement of any defective load limiters before further flight. The directive also specifies compliance times and references applicable service bulletins for corrective actions.
Why It Matters
The integrity of the rudder PCU load limiter is critical for proper rudder control and overall flight safety. Missing crimping on the load limiter end caps can lead to loss of adequate rudder control, posing a significant risk during flight operations. Compliance with this directive is essential for operators, maintenance organizations, and compliance teams to prevent potential control failures and ensure continued airworthiness.
What To Do
Operators of affected Bombardier CL-600-1A11, CL-600-2A12, and CL-600-2B16 aircraft must inspect the rudder PCU load limiters within specified air time limits ranging from 800 to 3400 hours after the directive's effective date of October 20, 2021. Defective load limiters identified by missing crimping or failed testing must be replaced before further flight. Repeat testing is required every 800 hours air time for certain serial number ranges until a terminating inspection is completed.
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