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: Every commercial airline must provide a copy to its pilots, and in many regions, at least one physical copy must be permanently stored in the flight deck. Structure of the Boeing 737-800 QRH
Unlike many modern jets, the 737-800 can be flown manually if hydraulic power is lost, and the QRH provides specific landing data for these "Manual Reversion" scenarios. boeing 737-800 qrh quick reference handbook
Consider this scenario: A 737-800 climbs through FL280 (28,000 feet) when a loud bang occurs, followed by a warning horn. : Every commercial airline must provide a copy