Summary
We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2E25 (Regional Jet Series 1000) airplanes. This proposed AD was prompted by a determination that without an effective maintenance task to maintain the airplane's inherent level of safety, there is a potential that a dormant failure of the alternate release system of the landing gear could occur. This proposed AD would require revising the maintenance or inspection program, as applicable, to incorporate a maintenance task for an operational check of the electro-mechanical actuator (EMA) and release mechanism of the alternate extension system (AES) for the nose landing gear (NLG) and main landing gear (MLG). We are proposing this AD to prevent failure of the alternate release system of the landing gear, which could prevent the landing gear from extending during a failure of the normal landing gear extension system.