Narrative:

I received the aircraft with a 'fume event' write-up from the previous captain. Contract maintenance subsequently arrived to troubleshoot the problem. After various attempts to isolate the source of the fumes; the technicians concluded that the likely source was the APU and pack 1. Other possible sources; according to them; were dirty pack filters or engine 2 that had been worked on previously according to the logbook. Troubleshooting/engine run-ups at the gate were; however; inconclusive regarding the latter theory. The APU bleed and pack 1 were deferred according to the MEL procedures to my satisfaction. Upon our taxi and departure; no fumes nor odors were detected. Nothing was detected in cruise or on initial descent into ZZZ. However; descending through 12;000 ft a faint burnt oil began being noticed by the entire crew. At 5;000 ft; the odor became very strong and almost unbearable. Both pilots donned our O2 masks and proceeded to land the aircraft without further incident. Pack 1 was then tuned off and cockpit windows opened to vent the cockpit. While holding for gate availability for 20 minutes; maintenance control and ZZZ operations were informed and the event recorded in the logbook. The cabin fumes/odor report was also filled out. Both pilots felt no symptoms after landing. One flight attendant reported a light headache and stinging eyes. She declined medical attention. The outbound flight was subsequently cancelled.continued efforts by the airline and industry stakeholders to determine the reasons and health consequences of these fume/odor events.

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Original NASA ASRS Text

Title: A319 Captain reported fumes filled the cockpit which got worse as they continued the descent.

Narrative: I received the aircraft with a 'fume event' write-up from the previous captain. Contract maintenance subsequently arrived to troubleshoot the problem. After various attempts to isolate the source of the fumes; the technicians concluded that the likely source was the APU and Pack 1. Other possible sources; according to them; were dirty Pack filters or ENG 2 that had been worked on previously according to the logbook. Troubleshooting/engine run-ups at the gate were; however; inconclusive regarding the latter theory. The APU Bleed and Pack 1 were deferred according to the MEL procedures to my satisfaction. Upon our taxi and departure; no fumes nor odors were detected. Nothing was detected in cruise or on initial descent into ZZZ. However; descending through 12;000 ft a faint burnt oil began being noticed by the entire crew. At 5;000 ft; the odor became very strong and almost unbearable. Both pilots donned our O2 masks and proceeded to land the aircraft without further incident. Pack 1 was then tuned off and cockpit windows opened to vent the cockpit. While holding for gate availability for 20 minutes; Maintenance Control and ZZZ OPS were informed and the event recorded in the logbook. The Cabin Fumes/Odor report was also filled out. Both pilots felt no symptoms after landing. One FA reported a light headache and stinging eyes. She declined medical attention. The outbound flight was subsequently cancelled.Continued efforts by the airline and industry stakeholders to determine the reasons and health consequences of these fume/odor events.

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.