EASA SIB NM-15-24
Beechcraft (formerly De Havilland, Hawker Siddeley, British Aerospace, Raytheon, Hawker Beechcraft) 125 and Hawker 800, 1000 aeroplanes — MLG Tire Tread Separation
Summary
The Special Airworthiness Information Bulletin SAIB: NM-15-24 is an FAA advisory addressing the risk of main landing gear (MLG) tire tread separation on Beechcraft 125 and Hawker 800 and 1000 series airplanes. It alerts operators and maintenance personnel about potential damage to the hydraulic servo block mounted on the MLG retraction jack caused by debris from tire tread separation during takeoff. The affected aircraft include various Beechcraft DH.125, HS.125, BH.125, BAe.125 series, and Hawker 800 and 1000 models up to specified serial numbers.
What Changed
This bulletin informs stakeholders of reported incidents where tire tread separation caused hydraulic servo block separation, leading to loss of hydraulic pressure and inability to lower landing gear and flaps. It highlights the existence of Beechcraft Service Bulletin 32-3777 from 2006, which provides procedures to replace the MLG jacks with improved mounts to resist tire debris damage. The FAA does not mandate corrective action but recommends compliance with the service bulletin.
Why It Matters
This information is critical for aviation professionals because tire tread separation can cause serious hydraulic system failures affecting landing gear and flap operation, potentially leading to gear-up landings and safety hazards. Operators and maintenance teams need to be aware of this risk to prevent incidents and maintain aircraft airworthiness. Early adoption of the recommended service bulletin can mitigate the risk of hydraulic system damage and improve flight safety.
What To Do
Owners, operators, and maintenance personnel of the affected Beechcraft and Hawker airplanes should review and implement the procedures in Beechcraft Service Bulletin 32-3777 dated October 2006 at the earliest opportunity. Although not mandatory, timely incorporation of the service bulletin is advised to reduce the risk of hydraulic servo block damage from tire debris. For further technical information, contact the FAA Wichita Aircraft Certification Office or Beechcraft Corporation.