EASA SIB SW-09-44: WITHDRAWN — REPLACED BY EASA AD 2010-0219

What to do

Operators should perform visual inspections of the cabin door hinge installation before each flight until the appropriate Schweizer service bulletin (DB-026, C1B-028, or B-292) is implemented at the next maintenance opportunity. Installation of the new production hinges or compliance with the service bulletins will mitigate the risk. No immediate mandatory action is required, but adherence to these recommendations is strongly advised.

Summary

WITHDRAWN — REPLACED BY EASA AD 2010-0219 is a Special Airworthiness Information Bulletin issued by the FAA regarding the potential in-flight separation of cabin doors on Schweizer Models 269 series helicopters, including 269A, TH-55A, 269A-1, 269B, 269C, 269C-1, and 269D with specified serial numbers. The bulletin addresses a design issue with the door hinge pins that could lead to door detachment during flight. It informs operators about the concern and provides recommendations to mitigate the risk.

What changed

This bulletin highlights the risk of cabin door separation due to loss of serrated hinge pins on Schweizer 269 series helicopters and introduces a 'fail safe' solution involving the installation of caps or welded stainless steel rods on hinge pin receptacles to prevent door hinge pins from falling out. Schweizer has updated production hinges with these caps and issued service bulletins for retrofit on existing aircraft. The FAA does not consider this an unsafe condition warranting an Airworthiness Directive at this time.

Why it matters

This information is critical for operators and maintenance personnel of Schweizer 269 series helicopters to prevent potential in-flight cabin door separation, which poses safety risks. Understanding the hinge design flaw and the recommended corrective actions helps ensure continued airworthiness and operational safety. Compliance with the service bulletins reduces the risk of door loss and associated hazards during flight.