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SYNOPSIS _x000D_
The aircraft had departed Dublin and was climbing towards cruising altitude when the Purser reported to the Captain that another Cabin Crew Member (CCM) appeared unwell and that passengers appeared to have fallen asleep quickly after take-off. Following a discussion the flight crew went on oxygen, declared an emergency and returned to Dublin where the aircraft landed without further incident. No defect was subsequently found on the aircraft. The report of the Investigation makes three safety recommendations.
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