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A B737-500 reported right engine bleed trips. Requested contract technician lock pressure regulator shutoff valve closed and defer per MEL. Technician locked high stage bleed valve closed in error.
| Attributes | |
| ACN | 688215 |
| Time | |
| Date | 200602 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | other |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 30 |
| ASRS Report | 688215 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : r eng bleed indications |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Environmental Factor Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
#2 engine's bleed air trips. I was asked by air carrier X maintenance control to lock prsov in closed position per MEL. I made a mistake and closed the high stage valve in closed position instead. This valve is installed just below the prsov.
Original NASA ASRS Text
Title: A B737-500 RPTED R ENG BLEED TRIPS. REQUESTED CONTRACT TECHNICIAN LOCK PRESSURE REGULATOR SHUTOFF VALVE CLOSED AND DEFER PER MEL. TECHNICIAN LOCKED HIGH STAGE BLEED VALVE CLOSED IN ERROR.
Narrative: #2 ENG'S BLEED AIR TRIPS. I WAS ASKED BY ACR X MAINT CTL TO LOCK PRSOV IN CLOSED POS PER MEL. I MADE A MISTAKE AND CLOSED THE HIGH STAGE VALVE IN CLOSED POS INSTEAD. THIS VALVE IS INSTALLED JUST BELOW THE PRSOV.
Data retrieved from NASA's ASRS site as of January 2009 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.