The Federal Aviation Administration (FAA) has ordered the inspection of 737 aircraft due to concerns over oxygen masks potentially failing to supply oxygen to passengers during a depressurisation event. The airworthiness directive (AD) is adopted for Boeing model 737-8, 737-9, 737-8200 and model 737-700, -800, and -900ER series airplanes. It is estimated to impact around 2,612 aircraft of US registry. The FAA read in its AD: “This AD was prompted by multiple reports of passenger service unit (PSU) oxygen generators shifting out of position within their associated PSU assemblies because of a retention failure.” It added: “Boeing has investigated the

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