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July 26, 2020

Emergency AD: Boeing 737

AD #: 2020-16-51 Boeing Company Model 737-300, -400, -500, -600, -700, -700c, -800, -900, And -900er Series Airplanes

The FAA has issued an emergency AD, "prompted by four recent reports of single-engine shutdowns due to engine bleed air 5th stage check valves being stuck open. Corrosion of the engine bleed air 5th stage check valve internal parts during airplane storage may cause the valve to stick in the open position. If this valve opens normally at takeoff power, it may become stuck in the open position during flight and fail to close when power is reduced at top of descent, resulting in an unrecoverable compressor stall and the inability to restart the engine. Corrosion of these valves on both engines could result in a dual-engine power

"The Work In Paris Is Finished, But The Investigation Is Far From Over"

The Transportation Safety Board of Canada (TSB) is confirming the completion of the download and preliminary analysis of the cockpit voice and flight data recorders from Ukraine International Airlines Flight 752 (PS752). A team of investigators from the affected States, including two TSB investigators, met at the Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile (BEA), in Paris, France, on 20 July 2020 to begin the readout of the flight recorders onboard PS752. In the course of a busy week, data from these flight recorders was successfully downloaded and preliminary analysis was carried out.