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deck floor. The water led to the GCUs commanding contactors to open, which isolated AC Bus 1 and 4. Water had entered the main cargo deck prior to departure because the L1 door had been left open during rain. TheOpen official document at PDF page 1AAIB final report: G-ONEE
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The commander advised ATC they had an electrical problem and around four minutes later AC Bus 1 lost power, causing the loss of the Cockpit Voice Recorder (CVR) for the remainder of the flight. During the next 20 minutes, theOpen official document at PDF page 2AAIB final report: G-ONEE
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Bulletin: G-ONEE AAIB-29853 The QRH procedure implied that with the cumulative failure of AC Bus 1 and AC Bus 4, the pitot probe heaters on both sides of the aircraft would be inoperative (Figure 1). It states ‘Avoid icing conditions'Open official document at PDF page 3AAIB final report: G-ONEE
Printed page label not indexed. PDF page 4.
multiple AC bus failures so the crew combined the information from elec ac bus 4 and elec ac bus 1 (Figure 1) to understand the system failures, specifically the possibility that all flight instrument indications may become unreliable. Figure 1Open official document at PDF page 4AAIB final report: G-ONEE
Printed page label not indexed. PDF page 7.
CVR was lost approximately 19 minutes into the flight when its only source of power, AC Bus 1, was lost. Central Maintenance Computer (CMC) messages were automatically transmitted from the aircraft during the flight using the aircraft manufacturer's Airplane HealthOpen official document at PDF page 7AAIB final report: G-ONEE
Printed page label not indexed. PDF page 8.
sensor and AOA is Angle of Attack sensor) The data in Figure 4 shows the timings for when AC Bus 1 and 4 were powered and unpowered, and it shows that the cabin altitude started climbing while the aircraft wasOpen official document at PDF page 8AAIB final report: G-ONEE