Summary
We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model BD-700-1A10 and BD-700-1A11 airplanes. This proposed AD was prompted by reports of an incorrectly assembled check tee fitting used in fire extinguishing (FIREEX) distribution lines. This proposed AD would require inspecting to determine the part number and for all affected check tee fittings measuring for correct depth, and replacing if necessary. We are proposing this AD to detect and correct faulty check tee fittings, which will reduce fire extinguishing protection.