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FAA to require more frequent testing of low cabin pressure warning systems on Boeing 737s Jordan Williams © Getty FAA to require more frequent testing of low cabin pressure warning systems on Boeing 737s The Federal Aviation Administration (FAA) will require more frequent testing of low cabin pressure warning systems on Boeing 737s. The FAA issued an Airworthiness Directive on Thursday, which was prompted by reports of latent failures of the cabin altitude pressure switches. The directive requires repetitive functional tests of pressure switches, and to replace the the switches if necessary. Operators of the plane have to test the parts every 2,000 flight hours. According to The Associated Press, testing currently happens on a 6,000-hour interval.

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