On 21 July 2017, a Boeing 737-800 taking off from Belfast was only airborne near the runway end of the runway and then only climbed at a very shallow angle until additional thrust was eventually added. The Investigation found that the thrust set had been based on an incorrectly input surface temperature of -52°C, the expected top of climb temperature, instead of the actual surface temperature. Although inadequate acceleration had been detected before V1, the crew did not intervene. It was noted that neither the installed FMC software nor the EFBs in use were conducive to detection of the data input error.