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Two mechanics report they inadvertently locked-out (deactivated) a pressure regulating valve (prv) instead of a high pressure shut-off valve (hpsov) on the left engine of a B767-300 ETOPS aircraft. Both valves look the same; have the same name (hpsov); same part number; and are interchangeable; but the location of each is allegedly not clear in the maintenance illustrations.
| Attributes | |
| ACN | 926735 |
| Time | |
| Date | 201012 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Pneumatic System Control |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Person 2 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
We locked-out the wrong [bleed] valve due to the paperwork being vague.
Original NASA ASRS Text
Title: Two mechanics report they inadvertently locked-out (deactivated) a Pressure Regulating Valve (PRV) instead of a High Pressure Shut-off Valve (HPSOV) on the left engine of a B767-300 ETOPS aircraft. Both valves look the same; have the same name (HPSOV); same Part Number; and are interchangeable; but the location of each is allegedly not clear in the maintenance illustrations.
Narrative: We locked-out the wrong [bleed] valve due to the paperwork being vague.
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.