Summary
We propose to supersede airworthiness directive (AD) 2010-13- 04, which applies to certain Bombardier, Inc. Model DHC-8-400 series airplanes. AD 2010-13-04 requires modifying the nose landing gear (NLG) trailing arm. Since we issued AD 2010-13-04, we received a report of several missing or damaged pivot pin retention bolts. This proposed AD would require installing a new pivot pin retention mechanism. This proposed AD would also add airplanes to the applicability. We are proposing this AD to prevent failure of the pivot pin retention bolt, which could result in a loss of directional control or loss of a NLG tire during take-off or landing.