Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain Bombardier Model DHC-8-301, -311, and -315 airplanes. This proposed AD would require replacing the pressure control valve of the Type 1 emergency door. This proposed AD is prompted by reports that the pressure control valve of the Type 1 emergency door is susceptible to freezing. We are proposing this AD to ensure that the pressure control valve does not freeze and prevent the door seal from deflating, which could result in the inability to open the door in an emergency.