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A TUI aircraft with 193 individuals on board did not pressurise as a result of crew members didn’t realise a swap had been left off by upkeep staff, forcing the pilots to abort the flight, an investigation has discovered.
The Boeing 737-8K5 took off from Manchester Airport for Kos, Greece, on 17 October final yr, however solely bought so far as northern Lincolnshire earlier than having to return.
The 193 individuals on board, six crew and 187 passengers, have been vulnerable to oxygen deprivation after a serious error was made by each pilots.
The Air Accidents Investigation Department discovered the pilots had failed to identify that switches that managed the engine air bleed programs had been left off by upkeep staff. The plane did not pressurise and a cabin altitude warning signal turned on.
The warning signal was on for 43 minutes, the report discovered. The jet returned to Manchester, with no accidents reported, however investigators mentioned that the crew and passengers “have been uncovered to the danger of hypoxia”.
Hypoxia is low ranges of oxygen within the physique, which may result in confusion, problem respiratory, and finally individuals passing out.
Whereas the danger of lack of consciousness was small for the altitude the aircraft was at when the fault was found, it might have been larger if the aircraft continued to climb.
The dearth of oxygen may have contributed to dangerous decision-making by the crew, investigators discovered.
Based on the report, each pilots had thought that the bleed swap was on earlier than take off, however when the aircraft handed round 15,000 ft the altitude warning signal got here on.
The commander mentioned “it was shortly seen that each engine bleeds have been off, these have been positioned straight again on and the issue was resolved”. The crew didn’t don oxygen masks and continued as regular till a fault was seen with the fitting air con unit.
The commander then stopped the climb and sought recommendation from bosses on the bottom, with the choice being made to return to Manchester Airport.
The report discovered that the crew didn’t full prescribed drills from a Fast Response Handbook in response to the cabin altitude warning.
Neither of the pilots had been initially scheduled to function the flight, and have been each on standby responsibility beginning at 3am that day. The commander was woken up by his cellphone at 1am with the information that he had been assigned the Manchester to Kos flight.
The co-pilot acquired a name at 2.30am and so they have been each informed to show up for work at 4.30am.