Summary
We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc., Model DHC-8-300 series airplanes. This proposed AD was prompted by reports indicating that a certain emergency exit door could not be opened during maintenance. This proposed AD would require a detailed inspection of the ball bearings of an emergency exit, replacement of bearings if necessary, application of corrosion inhibiting compound (CIC), and revision of the maintenance or inspection program, as applicable. We are proposing this AD to address the unsafe condition on these products.