The
There are two switches on each Boeing 737, and if both fail at the same time unsuspecting pilots could pass out from lack of oxygen, the FAA said in a rule posted Thursday.
The FAA said its order affects 2,502 planes registered in the
The order directs operators of the plane to test and, if necessary, replace parts called cabin altitude pressure switches every 2,000 flight hours instead of the current 6,000-hour interval.
The FAA said it doesn't know why the switches failed.
Federal rules require all airline planes to include a system that warns crews about depressurization. The pressure switches on Boeing 737s are designed to detect low pressure and trigger audible and visible warnings to pilots.
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