EASA AD US-2021-14-20
Jul 21, 2021Superseded by FAA AD 2022-24-09
FAA Airworthiness Directive 2021-14-20 is a final rule affecting all Boeing Model 737 airplanes. It addresses latent failures of the cabin altitude pressure switches, which are critical for warning flightcrew of cabin depressurization. The directive mandates repetitive functional tests and replacement of faulty switches to ensure continued safety.
- Boeing 737