Summary
We propose to adopt a new airworthiness directive (AD) for certain Airbus SAS Model A320-251N and -271N airplanes; and A321-251N, -253N, -271N, and -272N airplanes. This proposed AD was prompted by a report that during a calibration check, some torqueing tools used on the final assembly line have been found out of tolerance. This proposed AD would require retorqueing each affected connection of sense and fire extinguishing lines within the pylon area to a correct torque value, as specified in a European Aviation Safety Agency (EASA) AD, which will be incorporated by reference. We are proposing this AD to address the unsafe condition on these products.