The flight was about 55 miles east of Dublin when the crew declared an emergency.
The crew carried out a "controlled descent" to 10,000ft, initially reporting problems with cabin pressure. The flight was then cleared to descend to 6,000ft, where the crew entered a holding pattern for about 20 minutes.
Other aircraft, also on approach to Dublin, were advised of the emergency, with some being placed in a queue to facilitate the troubled jet.
The Boeing 737-800 aircraft made a normal and safe landing about 30 minutes after the emergency was declared. Airport emergency fire and medical crews were on standby for the plane when it touched down.
A passenger told the Aviation Herald website the captain announced over the public address system: "Emergency descent. Emergency descent."
The flight crew also deployed the overhead oxygen masks in the cabin, while cabin crew members instructed passengers on how to use them.
Another passenger said: "The head steward was excellent — calm, firmly instructing other staff what to do. However, one of the other cabin crew totally lost the plot and was crying, shaking, whimpering. I appreciate she’s only human, but her behaviour really frightened the passengers and basically made us think: ‘Well, if the air hostess is this scared, things must be really bad’."
A Ryanair spokesman said: "Flight 449 experienced a depressurisation on approach to Dublin. In keeping with standard procedures, the crew triggered the oxygen masks and initiated a controlled decent to an unpressurised level. The aircraft landed normally and taxied to the terminal where all passengers disembarked safely."
It has also been reported that a number of passengers appeared to be shocked and were cared for by paramedics. However, the airline has not commented on this.
The AAIU has confirmed that: "an investigation is under way."
Read more: http://www.irishexaminer.com/ireland/kfojojojkfau/rss2/#ixzz1NuSjXsZp
Our thoughts are with passengers and crew onboard flight FR-449 who must have been so scared.We must all thank the professionalism of Crew on board.Probationary cabin crew at Ryanair need respect from Mr Bonderman tpg capital and O'Lesary...