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Gfa ad 645 issue 1

MAIN UNDERCARRIAGE LEGS INSPECTION / REPLACEMENT

GROB has received several reports of G109 and G109B Main Undercarriage Leg failure during landing. In two of these cases it was found that the aircraft had been subjected to severe training use. The failures have occurred between 2500 & 3000 landings and the origin of the failure appears to be associated with incorrectly installed retaining bars, and pitting due to corrosion. The LBA has issued AD 94-004/2, & GROB has issued Service Bulletin TM 817-39 04 Jan 1994, which is attached to and forms part of this AD. Once the Undercarriage Legs have been replaced the requirement for periodic inspections at 1000 flight cycle intervals is removed.