Summary
The FAA proposes to supersede Airworthiness Directive (AD) 2019-03-26, which applies to certain The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. AD 2019-03-26 requires modifying the passenger service units (PSUs) and life vest panels by replacing the existing inboard lanyard and installing two new lanyards on the outboard edge of the PSUs and life vest panels; measuring the distance between the hooks of the torsion spring of the lanyard assembly; replacing discrepant lanyard assemblies; and re- identifying serviceable lanyard assemblies. Since the FAA issued AD 2019-03-26, it has been determined that certain airplanes are listed in the wrong configuration and certain PSUs have not been correctly re- identified. This proposed AD would retain the requirements of AD 2019- 03-26, and, for certain airplanes, would require an inspection to determine if the re-identified PSU part number is correct, and further re-identification if necessary. TheFAA is proposing this AD to address the unsafe condition on these products.