Serious incident to the Airbus A320 registered EP-TTA and operated by Iranair Tours on 25/11/2018 en route [Investigation led by AAIB / Iran]

Preliminary data based on the notification from the Iranian authorities:

At FL340 from Thr to Awz , the cabin pressure has dropped . All onboard persons used oxygen mask. Aircraft had emergency descend to FL140. Finally aircraft had safe landing.

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General information
Local date	25/11/2018
Responsible entity	Iran, Islamic Republic of - AIB
State or area of occurrence	Iran, Islamic Republic of
Location	En croisière
Human consequences	None
Aircraft consequences	None
Occurrence class	Incident
File number	BEA2018-0855

Flight Information
Aircraft category	Aeroplane - Large aeroplane
Operator	Iran, Islamic Republic Of - Iranair Tours Co.
Manufacturer / Model	AIRBUS - A320
Aircraft Registration	EP-TTA
State of registry	Iran, Islamic Republic of
Last departure point	Iran - OIII (THR) : Tehran/Mehrabad Intl
Planned destination	Iran - OIAW (AWZ) : Ahwaz
Flight phase	En route
Serial number	393
Operator Type AG
Operation Type	Commercial Air Transport - Passenger - Airline

BEA is the French air safety investigation authority for civil aviation. The sole objective of the investigation is to improve air safety. It is intended neither to apportion blame nor to assess responsiblity.