Nike GV Incident Results in Gulfstream Service Letter
Gulfstream's initial investigation into the November 21 incident involving a jammed right landing gear on Nike's GV revealed corrosion on the main landing gear (MLG) uplock linkage bungee. According to a December 5 service letter sent to GV, G500 and G550 operators, "It is suspected this corrosion caused the bungee to freeze in the extended position, contributing to the MLG door being out of sequence during the extension and retraction cycles... With the door linkage system out of sequence, hydraulic pressure was attempting to close the door before the landing gear had completed its retraction cycle." The gear finally was freed after the Nike crew removed hydraulic pressure by temporarily shutting down the left engine and performing a negative g maneuver. In addition to other solutions being considered, "Gulfstream is evaluating the addition of a filler to the inboard gear door where the tire made contact."