pdf Gfa ad 671 Cancelled 2018.09.13 Popular

FLIGHT CONTROLS – AIR BRAKE CONTROL SYSTEM TORSION TUBE – TEST / INSPECTION / PROTECTION / REPLACEMENT

CANCELLED Refer EASA AD 2011-0110

A report has been received of a failed air brake control system torsion tube on a Diamond (formerly Hoffmann) H 36 powered sailplane. The results of the subsequent investigation show that the failure was due to corrosion damage. This condition, if not detected and corrected, may lead to failure of the air brake control system in flight, resulting in reduced control of the aeroplane. To address this unsafe condition, Diamond published Mandatory Service Bulletin (MSB) 36-105, containing instructions to test and inspect the air brake control system torsion tube for corrosion damage and, depending on findings, the application of anticorrosive agent to the inside of the torsion tube, or replacement of the torsion tube with a serviceable part. For the reasons described above, this new AD requires repetitive tests and inspections of the air brake control system torsion tube and applicable corrective actions, depending on findings.