Flight crew reported being notified two days after flight that they transported undeclared hazmat ca...

Attributes
ACN	1747654
Time
Date	202006
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZZ.Airport
State Reference	FO
Aircraft 1
Make Model Name	Widebody Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Other Postflight -2days later
Flight Plan	IFR
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Deviation - Procedural Hazardous Material Violation Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

The flight was uneventful to my knowledge from a safety perspective. On june xx; 2020 I was informed by our safety department that a piece of cargo transported on our flight and subsequently to ZZZ1 on the same aircraft contained[er] an undeclared lithium battery. This cargo subsequently experienced a thermal runaway and caught fire. This report is being submitted at the request of the safety department; as had the cargo experienced a thermal runaway sooner it may have caused damage; injury or death to the aircraft and crew as the undisclosed item was transported. The failure to disclose the hazardous material could have resulted in other incompatible materials being placed without adequate segregation to this cargo and would have complicated efforts to identify and extinguish the item both in flight and on the ground. I have no other knowledge of the incident or the cargo and would refer further questions to the safety department. Cause: lithium ion battery fire in an undeclared battery shipment.

Original NASA ASRS Text

Title: Flight crew reported being notified two days after flight that they transported undeclared Hazmat cargo; lithium Ion; which experienced a thermal runaway at a downline station.

Narrative: The flight was uneventful to my knowledge from a safety perspective. On June XX; 2020 I was informed by our safety department that a piece of cargo transported on our flight and subsequently to ZZZ1 on the same aircraft contained[er] an undeclared lithium battery. This cargo subsequently experienced a thermal runaway and caught fire. This report is being submitted at the request of the safety department; as had the cargo experienced a thermal runaway sooner it may have caused damage; injury or death to the aircraft and crew as the undisclosed item was transported. The failure to disclose the Hazardous Material could have resulted in other incompatible materials being placed without adequate segregation to this cargo and would have complicated efforts to identify and extinguish the item both in flight and on the ground. I have no other knowledge of the incident or the cargo and would refer further questions to the safety department. Cause: lithium ion battery fire in an undeclared battery shipment.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Flight crew reported being notified two days after flight that they transported undeclared hazmat cargo; lithium ion; which experienced a thermal runaway at a downline station.