Whilst climbing through FL200, the crew became aware of a pressurisation issue and initiated a descent. The cabin masks automatically deployed when the cabin altitude reached 12,500 ft. The aircraft returned to Bristol for an uneventful landing. Post-maintenance examination did not identify the cause of the fault and the aircraft was returned to service.
The CVR was not disabled following the incident and the operator is taking action to remind flight crews of their obligations in this respect.
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Published 14 December 2017