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Mechanic reports one of their A319's has had five new skin valves replaced in a two week period. Only after installing a known 'good' skin valve was the problem corrected.
| Attributes | |
| ACN | 826004 |
| Time | |
| Date | 200903 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | A320 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Aircraft Cooling System |
| Person 1 | |
| Function | Technician |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
Aircraft has had 5 skin air valves in the past 2 weeks. Wiring checks were accepted and nothing found. This aircraft has had delays and cancellations because of this valve. It was on the ground for 60 hours before we installed a known good part from another aircraft and corrected the problem. For mechanics to receive so many unairworthy parts from stock is unacceptable. Callback conversation with reporter revealed the following information: reporter stated numerous flight crews reported hearing a hissing noise coming from the east/east compartment; below the flight deck; while in flight. They would also get a 'skin valve' ECAM messages. Reporter stated they could not believe so many skin heat exchanger isolation valves coming from stock; could be un-airworthy. Numerous flight tests were necessary; due to the hissing and failure faults occurring only inflight; only to find out later; when they decided to use a known 'good' isolation valve; that all the previous new replacement valves were faulty. The hissing was located near a water separator drum in the left side area of the lower avionics compartment.
Original NASA ASRS Text
Title: Mechanic reports one of their A319's has had five new skin valves replaced in a two week period. Only after installing a known 'good' skin valve was the problem corrected.
Narrative: Aircraft has had 5 skin air valves in the past 2 weeks. Wiring checks were accepted and nothing found. This aircraft has had delays and cancellations because of this valve. It was on the ground for 60 hours before we installed a known good part from another aircraft and corrected the problem. For mechanics to receive so many unairworthy parts from stock is unacceptable. Callback conversation with Reporter revealed the following information: Reporter stated numerous flight crews reported hearing a hissing noise coming from the E/E compartment; below the flight deck; while in flight. They would also get a 'Skin Valve' ECAM messages. Reporter stated they could not believe so many Skin Heat Exchanger Isolation Valves coming from stock; could be un-airworthy. Numerous flight tests were necessary; due to the hissing and failure faults occurring only inflight; only to find out later; when they decided to use a known 'good' isolation valve; that all the previous new replacement valves were faulty. The hissing was located near a water separator drum in the left side area of the lower avionics compartment.
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.