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Significant Factors


  1. The aircraft systems faults reported most likely arose as a result of moisture ingress into a number of electronic components located in the aircraft E/E Bay.
  2. Moisture ingress was possible due to moisture shields not being fitted in the E/E Bay following the modification, by the previous operator, to remove the airstairs from the aircraft.
  3. The moisture shields were deemed by the aircraft manufacturer to be mandatory equipment.
  4. The cabin floor angle during the emergency descent was reported as being similar to a normal descent and this may have led the cabin crew to assess that it was safe to return to their crew seats at the rear of the cabin during the emergency descent.

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