The Boeing Company Proposes New Airworthiness Directive for 737-100, -200, -200C, -300, -400, and -500 Series Airplanes

Summary

The Boeing Company is proposing a new airworthiness directive (AD) to address a design change in the cabin altitude warning system, which could prevent flightcrew incapacitation due to failure to recognize a valid cabin altitude warning horn. The proposed AD would require installing warning lights and revising flight manuals for certain airplanes.