A-320 first officer reported a fume event during preflight resulting in a maintenance delay.

Attributes
ACN	1722676
Time
Date	202001
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	Pneumatic System
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

I understand the need to keep the airplanes moving; but until there is a true fix for these issues; it would have been much faster if the pack and or bleed was deferred right away; instead of just running the packs on the ground via APU to try and replicate. Since this potentially was from engine oil/engine bleeds; running the packs via the APU bleed; did not make sense. That doesn't eliminate the engine; engine bleed and oil as a suspected source of the fumes; since the engine was not running. That plus the remaining smell; is why I had to stand my ground to get more done; to agree the aircraft was safe to continue. I felt the chance of it reoccurring in this case was unacceptable.

Original NASA ASRS Text

Title: A-320 First Officer reported a fume event during preflight resulting in a maintenance delay.

Narrative: I understand the need to keep the airplanes moving; but until there is a true fix for these issues; It would have been much faster if the pack and or bleed was deferred right away; instead of just running the packs on the ground via APU to try and replicate. Since this potentially was from engine oil/engine bleeds; running the packs via the APU bleed; did not make sense. That doesn't eliminate the engine; engine bleed and oil as a suspected source of the fumes; since the engine was not running. That plus the remaining smell; is why I had to stand my ground to get more done; to agree the aircraft was safe to continue. I felt the chance of it reoccurring in this case was unacceptable.

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.