Boeing 737 operators have six years to modify cabin pressurization loss warning systems, including installing redundant pressure switches and new warning modules, FAA orders in an airworthiness directive (AD 2012-19-11). The AD which applies to all 737 models, was prompted by a probe into an inflight cabin depressurization and passenger oxygen mask deployment. Boeing says the plane’s pilots did not receive an aural warning when cabin pressure exceeded 10,000 ft.; a cabin crew member ...

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