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A B757-200 technician attempted to reset the left bleed control valve but inadvertently locked the valve closed. Discovered after takeoff.
| Attributes | |
| ACN | 666498 |
| Time | |
| Date | 200507 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 666498 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : repair performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : testing |
| Supplementary | |
| Problem Areas | Environmental Factor Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
I voluntarily tried to reset the l-hand prsvo even though I forgot to take my inspection mirror. Because of number of times that I had done it with mirror; I was confident that it worked because the engine started. The aircraft took off without pneumatic bleed; which means that I accidentally overturned the reset point to lockout position.
Original NASA ASRS Text
Title: A B757-200 TECHNICIAN ATTEMPTED TO RESET THE L BLEED CTL VALVE BUT INADVERTENTLY LOCKED THE VALVE CLOSED. DISCOVERED AFTER TKOF.
Narrative: I VOLUNTARILY TRIED TO RESET THE L-HAND PRSVO EVEN THOUGH I FORGOT TO TAKE MY INSPECTION MIRROR. BECAUSE OF NUMBER OF TIMES THAT I HAD DONE IT WITH MIRROR; I WAS CONFIDENT THAT IT WORKED BECAUSE THE ENG STARTED. THE ACFT TOOK OFF WITHOUT PNEUMATIC BLEED; WHICH MEANS THAT I ACCIDENTALLY OVERTURNED THE RESET POINT TO LOCKOUT POS.
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.