Airworthiness Directives; Bombardier, Inc., Airplanes

We propose to supersede Airworthiness Directive (AD) 2014-05- 28, for certain Bombardier, Inc., Model DHC-8-400 series airplanes. AD 2014-05-28 requires revising the maintenance or inspection program, as applicable. Since we issued AD 2014-05-28, we have determined that the interval from maintenance review board (MRB) task number 323100-202 should not be escalated, and that Certification Maintenance Requirements (CMR) task number 323100-102 should be applicable to all Model DHC-8-400 series airplanes, regardless of which main landing gear (MLG) up-lock assembly is installed. This proposed AD would require revising the maintenance or inspection program, as applicable. We are proposing this AD to address the unsafe condition on these products.