WASHINGTON, Feb. 24 (TNSFR) -- The U.S. Department of Transportation Federal Aviation Administration issued an airworthiness directive requiring immediate changes to flight manual procedures for Boeing 737-8, 737-9 and 737-8200 airplanes. The action follows reports of in-flight events where cabin and flight deck temperatures reached uncontrollable levels.

Investigators found that these extreme temperature spikes occur when a specific circuit breaker in the standby power control unit . . .

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