A319 captain reported a fume event during initial approach descent.

Attributes
ACN	1755992
Time
Date	202008
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	APU
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

During descent to ZZZ strong odor entered the cabin mostly when thrust at idle. Clearing during taxing to gate. Made aml entry; maintenance found oil leak in APU and said that's what caused the odor. APU was not running during descent though? When accepting the aircraft one of the flight attendants who had been through a odor event before had noticed the residual from the previous flight and had her self removed; no others including myself felt it was that abnormal. Knowing that smell now I would be more aware and think I would refuse it until the source is know.listen more closely to the concerns of all crew members even if they are the only one.

Original NASA ASRS Text

Title: A319 Captain reported a fume event during initial approach descent.

Narrative: During descent to ZZZ strong odor entered the cabin mostly when thrust at idle. Clearing during taxing to gate. Made AML entry; Maintenance found oil leak in APU and said that's what caused the odor. APU was not running during descent though? When accepting the aircraft one of the flight attendants who had been through a odor event before had noticed the residual from the previous flight and had her self removed; no others including myself felt it was that abnormal. Knowing that smell now I would be more aware and think I would refuse it until the source is know.Listen more closely to the concerns of all crew members even if they are the only one.

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.