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A line mechanic reports about an A320 air turnback due to a #2 cabin pressure controller failure. Mechanic had previously replaced the #2 controller with a borrowed part from another carrier. Both of the A320's pressure controllers then passed the A320's on-board mcdu operational test without any faults noted even though the dust cover was still on the #2 controller pressure port.
| Attributes | |
| ACN | 883088 |
| Time | |
| Date | 201003 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Pressurization Control System |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Experience | Maintenance Technician 13 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Deviation - Procedural Maintenance Inflight Event / Encounter Other / Unknown |
Narrative:
An A320 aircraft lost cabin pressure en route from ZZZ to ZZZ1. The aircraft returned to ZZZ where it was discovered that the #2 cabin pressure controller had shipping cap installed on the pressure port. I was assigned to work on cabin pressure controller #2 box two days earlier. Upon installation I thought that [cap] was a dust cover; I left cover on the port. All work done per maintenance manual (MM) 21-31-00-710. It was honest mistake; never thought that cover has to be removed because it passed the ground operations check. There was not any caution tag on the box; but it was in amm. I thought the amm note was referring to the electrical pins cover on the back of the box. It was clearly my mistake that I did not read the whole paragraph. I learned my lesson from this mistake.
Original NASA ASRS Text
Title: A Line Mechanic reports about an A320 air turnback due to a #2 cabin pressure controller failure. Mechanic had previously replaced the #2 controller with a borrowed part from another carrier. Both of the A320's pressure controllers then passed the A320's on-board MCDU operational test without any faults noted even though the dust cover was still on the #2 controller pressure port.
Narrative: An A320 aircraft lost cabin pressure en route from ZZZ to ZZZ1. The aircraft returned to ZZZ where it was discovered that the #2 cabin pressure controller had shipping cap installed on the pressure port. I was assigned to work on cabin pressure controller #2 box two days earlier. Upon installation I thought that [cap] was a dust cover; I left cover on the Port. All work done per Maintenance Manual (MM) 21-31-00-710. It was honest mistake; never thought that cover has to be removed because it passed the Ground Operations Check. There was not any Caution tag on the box; but it was in AMM. I thought the AMM note was referring to the electrical pins cover on the back of the box. It was clearly my mistake that I did not read the whole paragraph. I learned my lesson from this mistake.
Data retrieved from NASA's ASRS site as of April 2012 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.