Summary
We propose to adopt a new airworthiness directive (AD) for all Gulfstream Aerospace Corporation Model G-1159B airplanes. This proposed AD was prompted by a review of airplane maintenance records, which revealed that incorrect rudder assemblies were installed on certain airplanes. This proposed AD would require certain inspections, and replacement or modification of the rudder assembly if necessary. We are proposing this AD to address the unsafe condition on these products.