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G-ONEE: electrical failures and unreliable airspeed

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AAIB Bulletin: G-ONEE AAIB-29853 Serious Incident Aircraft Type and Registration: Boeing 747-433, G-ONEE No & Type of Engines: 4 Pratt & Whitney turbofan engines Year of Manufacture: 1991 (Serial no:
Open official document at PDF page 1AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

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AAIB Bulletin: G-ONEE AAIB-29853 in the water ingress protection measures were found that could have caused or contributed to the water ingress. There have been previous events of water ingress into G
Open official document at PDF page 2AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

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AAIB 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
Open official document at PDF page 3AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

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AAIB Bulletin: G-ONEE AAIB-29853 the handling pilot reduced the thrust to idle. The corrective actions were not fast enough to prevent the overspeed warning triggering. The commander advised ATC “we'r
Open official document at PDF page 4AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

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AAIB Bulletin: G-ONEE AAIB-29853 The crew reported that they discussed how they would be affected by carrying out the Memory Items9 associated with the Airspeed Unreliable checklist (Figure 2). It was
Open official document at PDF page 5AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

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AAIB Bulletin: G-ONEE AAIB-29853 As the AC buses became unavailable, many systems that receive power from them failed. With each failure an EICAS message was generated and displayed for the crew. It w
Open official document at PDF page 6AAIB final report: G-ONEE