EASA SIB NM-13-38
Learjet 23, 24, 25, 28, 29, 31, 35 and 36 Aeroplanes - Flight Control Column Section
Summary
The FAA Special Airworthiness Information Bulletin SAIB: NM-13-38 addresses a potential airworthiness concern involving possible cracking in the flight control column section of Learjet Model 23, 24, 25, 28, 29, 31, 35, and 36 airplanes. This bulletin informs owners, operators, and maintenance personnel about the issue without mandating regulatory action. It highlights findings of cracks at the base of the control column where it attaches to the floor structure and references related Learjet Service Bulletins for inspection and repair.
What Changed
This bulletin introduces awareness of cracking issues found in the control column bearing boss area on several Learjet models. It provides information on the affected parts and references specific Learjet Service Bulletins that detail inspection and repair procedures. No new mandatory Airworthiness Directive has been issued, but the FAA recommends following the service instructions promptly.
Why It Matters
This information is critical for aviation professionals to ensure continued safe operation of affected Learjet aircraft by identifying a structural concern that could impact flight control integrity. Maintenance and compliance teams need to be aware of the potential for cracks to prevent possible control system failures. Early detection and repair as outlined in the service bulletins help maintain airworthiness and avoid more serious safety issues.
What To Do
Owners and operators of the affected Learjet models should inspect the flight control column for cracks following the procedures in the referenced Learjet Service Bulletins. If cracks are found, the control column assembly should be replaced or repaired with reinforcement as specified. These actions should be performed at the earliest opportunity to ensure continued safe operation.