The Federal Aviation Administration (FAA) has actually issued an emergency airworthiness directive (AD) for around 2,000 US registered Boeing737 NG and Traditional airplane.
According to the FAA, this ADVERTISEMENT was triggered after four current reports of single-engine shutdowns; brought on by engine bleed air fifth stage check valves stuck in the employment opportunity.
” Corrosion of the engine bleed air 5th phase check valve internal parts during aircraft storage might cause the valve to stick in the open position.”
In the worst-case scenario, rust of these valves on both engines might lead to a dual-engine failure; this would leave the airplane without the capability to reboot and consequentially could result in a required off-airport landing.
This AD is valid for any 737 NG (600 to 900 series) and 737 Traditional (737-300 to 737-500 series) that, for 7 or more successive days, has not been operated in flight or is considered to be in “storage.
In the U.S.A., a number of airline companies operate this type of airplane; including United Airlines, Delta, Southwest Airlines and American Airlines The B737 MAX remains grounded.
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source https://jobsearchtips.net/faa-issues-emergency-situation-directive-for-2000-b737s/
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