A319 first officer reported air conditioning pack failure inflight.

Attributes
ACN	1673806
Time
Date	201908
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZZ.Airport
State Reference	FO
Environment
Light	Daylight
Aircraft 1
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

This is a follow up to [an ASRS report] already filed for this flight. Maintenance found pack 1 flow control valve failed. Maintenance replaced it with contract maintenance. Part was flown down. After; captain showed me a printed message. Indicating pack 1 flow control valve failed. However the pack was operating normally. But pack 2 was still on MEL. I think the printed report was telling us pack 2 was inoperative. But it printed up as pack 1 also; as was indicated in previous as soon as possible. When our pack 1 failed we received no warning. No ECAM (electronic centralized aircraft monitor). Nothing. Also. No bells whistles. No alerts. Nothing until I saw cabin altitude at 13000 ft. Then I immediately descended. Pack 1 operated normally during the flight when maintenance replaced the p1 flow control valve. Possible wiring ECAM pack lead error. Wired backwards.

Original NASA ASRS Text

Title: A319 First Officer reported air conditioning pack failure inflight.

Narrative: This is a follow up to [an ASRS Report] already filed for this flight. Maintenance found Pack 1 flow control valve failed. Maintenance replaced it with contract Maintenance. Part was flown down. After; Captain showed me a printed message. Indicating Pack 1 Flow Control Valve failed. However the pack was operating normally. But Pack 2 was still on MEL. I think the printed report was telling us Pack 2 was inoperative. But it printed up as Pack 1 also; as was indicated in previous ASAP. When our Pack 1 failed we received no warning. No ECAM (Electronic Centralized Aircraft Monitor). Nothing. Also. No bells whistles. No alerts. Nothing until I saw cabin altitude at 13000 ft. Then I immediately descended. Pack 1 operated normally during the flight when Maintenance replaced the p1 flow control valve. Possible wiring ECAM pack lead error. Wired backwards.

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.