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A mechanic reports he believes an FBO contract maintenance provider mistakenly deactivated the pressure regulating valve (prv) on an A319 causing a #2 engine bleed fault and cabin pressure 2 fault. The high pressure valve (hpv) was deferred and deactivated; but the prv was also found deactivated. Mechanic found a muscle line between the prv and the hp valve leaking pneumatic air.
| Attributes | |
| ACN | 890440 |
| Time | |
| Date | 201005 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Pressurization System |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural MEL Deviation - Procedural Published Material / Policy |
Narrative:
An airbus A319 aircraft came to us with a #2 engine bleed fault; cabin pressure fault and the #2 engine high pressure valve (hpv) deferred per MEL 36-11. We found the hpv deactivated per the MEL; but also found the pressure regulating valve (prv) deactivated.previously the [flight] crew returned to the gate due to a hpv fault with the hpv deferred. This message would be a normal with certain bleed configurations with the hpv locked closed. While confirming the deactivation of the hpv; I believe the FBO mistakenly deactivated the prv causing the bleed and pressure faults. We found a leaking muscle line between the prv and the hpv and replaced it. We reactivated the prv and hpv and the #2 bleed checked good.
Original NASA ASRS Text
Title: A Mechanic reports he believes an FBO Contract Maintenance Provider mistakenly deactivated the Pressure Regulating Valve (PRV) on an A319 causing a #2 engine bleed fault and cabin pressure 2 fault. The High Pressure Valve (HPV) was deferred and deactivated; but the PRV was also found deactivated. Mechanic found a muscle line between the PRV and the HP valve leaking pneumatic air.
Narrative: An Airbus A319 aircraft came to us with a #2 Engine Bleed Fault; Cabin Pressure Fault and the #2 Engine High Pressure Valve (HPV) deferred per MEL 36-11. We found the HPV deactivated per the MEL; but also found the Pressure Regulating Valve (PRV) deactivated.Previously the [Flight] crew returned to the gate due to a HPV Fault with the HPV deferred. This message would be a normal with certain bleed configurations with the HPV locked closed. While confirming the deactivation of the HPV; I believe the FBO mistakenly deactivated the PRV causing the bleed and pressure faults. We found a leaking muscle line between the PRV and the HPV and replaced it. We reactivated the PRV and HPV and the #2 bleed checked good.
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.