Incident to the Airbus A330 registered 4R-ALR operated by Srilankan Airlines on 21/03/2021 en route

Preliminary data based on the notification from the Sri Lankan authorities:

During cruise phase over Jakarta FIR at FL 390, Auto pilot 1 disengaged and encountered an altitude deviation. Flight crew manually controlled and returned to FL 390. Aircraft landed at the destination safely.

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General information
Local date	21/03/2021
Responsible entity	Sri Lanka - AIB
State or area of occurrence	Indonesia
Location	En croisière FL 390
Human consequences	None
Aircraft consequences	None
Occurrence class	Incident
File number	BEA2021-0172

Flight Information
Aircraft category	Aeroplane - Large aeroplane
Operator	Sri Lanka - Srilankan Airlines
Manufacturer / Model	AIRBUS - A330
Aircraft Registration	4R-ALR
State of registry	Sri Lanka
Last departure point	Sri Lanka - VCBI (CMB): Colombo/Katunayake
Planned destination	Australia - YSSY (SYD): Sydney / Kingsford Smith International
Flight phase	En route
Serial number	1689
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.