Air Accidents Investigation Branch
November 14
10:01
2024
class="gem-c-govspeak govuk-govspeak govuk-!-margin-bottom-0">
A cabin altitude warning was activated as the aircraft passed FL130. Both engine bleed air systems had been inadvertently left off for the departure, so the aircraft failed to pressurise. The crew selected both systems on and continued the climb. The aircraft then generated a pack caution, so the crew stopped the climb at FL200. After discussion with the operators maintenance control the commander decided to return to the departure airfield. Recorded data indicated that the cabin altitude warning remained on for 43 minutes. The crew did not don oxygen masks.