Serious incident to the Airbus A320 registered XA-VAR operated by Aeroenlances Nacionales on 29/12/2019 en route [Investigation led by AIB / Mexico]

Preliminary data based on the notification from the Mexican authorities:

The crew under command of the flight VIV 1329, requested to TWR HMO return by problems with the pressure in the cockpit.

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General information
Local date	29/12/2019
Responsible entity	Mexico - CAA
State or area of occurrence	Mexico
Location	En croisière
Human consequences	None
Aircraft consequences	None
Occurrence class	Serious incident
File number	BEA2020-0074

Flight Information
Aircraft category	Aeroplane - Large aeroplane
Operator	Mexico - Aeroenlaces Nacionales, S.A. De C.V.
Manufacturer / Model	AIRBUS - A320
Aircraft Registration	XA-VAR
State of registry	Mexico
Last departure point	Mexico - MMHO (HMO): Hermosillo/Intl
Planned destination	Mexico - MMMX (MEX): Mexico/Lic. Benito Juarez Intl
Flight phase	En route
Serial number	6955
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.