The Federal Aviation Administration (FAA) has ordered an emergency inspection of up to 2000 Boeing 737 aircraft in service because of a possible engine valve problem that could lead to engine stall.
Issued on 23 July 2020 the Airworthiness Directive (AD) was directed to owners and operators of the Boeing Company Model 737-300, -400,-500,-600,700 -700C, -800,-900 and -900ER series airplanes.
According to the FAA, “The emergency AD was 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.”
The FAA is issuing this AD to address corrosion of the engine bleed air 5th stage check valves for both engines, which could result in compressor stalls and dual-engine power loss without the ability to restart. This could result in a forced off-airport landing, according to the FAA.
In a statement Boeing said: “with airplanes being stored or used infrequently due to lower demand during the COVID19 pandemic, the valve can be more susceptible to corrosion.”
Various African airlines operate the Boeing 737 series aircraft and they have been bringing them back to service after months of being grounded. The Airworthiness Directives comes at an opportune time in ensuring total safety to the industry.
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