User:Pierre5018/sandbox

A Sunwing Boeing 737 NG serious incident, with 185 people aboard, taking off from the Belfast and bound for Corfu on July 24, 2017. The outside air temperature was 16 C, but the operating crew entered an incorrect outside air temperature of -47 C into the flight management computer, resulting in miscalculation of the required engine fan or low pressure compressor speed: "When the co-pilot returned from the exterior inspection, he listened to the ATIS to find out the runway in use and the weather conditions. Using the passenger and baggage figures from the ground handling company, and the weather information from the ATIS, each pilot completed weight and balance, and performance calculations independently on his EFB. These calculations were then crosschecked before the information was entered into the FMC. The flight crew then completed a taxi and takeoff briefing covering items such as the expected taxi and departure routing and including a discussion on the handling of emergencies during the takeoff and departure. At some point during the cockpit preparation, a figure of -47°C was entered into the FMC as the outside air temperature (OAT)."

- Belfast International Airport on 21 July 2017''

A recent software release had not yet been installed, and the software omitted the cross-check of the pilot input data against the outside air temperature actually measured. The investigation Report explored various human-factors aspects of the incident, concluding that the pilots could not reasonably have been expected to respond more quickly to the developing situation, either before or after becoming airborne. It reviews and lists recent incidents of aircraft underperformance at take-off, reviews industry efforts to provide automatic warning in such situations, and calls for closer regulatory attention to pilots' portable computers ('electronic flight bags').