Summary
This document withdraws a supplemental notice of proposed rulemaking (NPRM) that would have applied to all Bombardier Inc. Models DHC-6-1, DHC-6-100, DHC-6-200, and DHC-6-300 airplanes. The NPRM would have superseded both AD 80-13-11 R2 and AD 80-03-08, which currently require repetitive inspections of the flight control rods for cracks on the above-referenced airplanes, with replacement of any cracked flight control rods. The NPRM would have required replacement of these flight control rods with improved design parts and would have reduced the need for the number of repetitions of the inspections. After evaluating all the comments received on the proposal, we have determined that, since the need for repetitive inspections is not eliminated by the replacements, the requirements of the current AD's should stand. We have not received any recent service problems regarding this subject on the affected airplanes. For these reasons, we are withdrawing the supplemental NPRM.