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A B737-300 with logbook write-up 'a' system electric hydraulic pump tripped circuit breaker reset ok. Technician checked pump operation per manual and signed off pump checks ok per manual. Pump failed next flight out.
| Attributes | |
| ACN | 701878 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 701878 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : a electric c/b tripped other flight crewa other flight crewb |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : fault isolation performance deficiency : testing |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Aircraft |
Narrative:
Aircraft arrived with a #1 electric hydraulic pump circuit breaker having popped. Crew reset circuit in-flight and system operated normal. Operations checked 'a' hydraulic electric system per maintenance manual. Operations check passed. Signed off log as operations checked hydraulic system 'a;' called duty center and information noted circuit breaker popping. There was no prior history on this problem. Made an information note write-up and sent aircraft. Problem reappeared later. Pump was changed. This incident revolves around a popped circuit breaker. No prior history and crew rest; and no further problems. We have a circuit breaker reset procedure to follow which I felt I did. This was an information noted signoff.
Original NASA ASRS Text
Title: A B737-300 WITH LOGBOOK WRITE-UP 'A' SYS ELECTRIC HYD PUMP TRIPPED CIRCUIT BREAKER RESET OK. TECHNICIAN CHKED PUMP OP PER MANUAL AND SIGNED OFF PUMP CHKS OK PER MANUAL. PUMP FAILED NEXT FLT OUT.
Narrative: ACFT ARRIVED WITH A #1 ELECTRIC HYD PUMP CIRCUIT BREAKER HAVING POPPED. CREW RESET CIRCUIT INFLT AND SYS OPERATED NORMAL. OPS CHKED 'A' HYD ELECTRIC SYS PER MAINT MANUAL. OPS CHK PASSED. SIGNED OFF LOG AS OPS CHKED HYD SYS 'A;' CALLED DUTY CTR AND INFO NOTED CIRCUIT BREAKER POPPING. THERE WAS NO PRIOR HISTORY ON THIS PROB. MADE AN INFO NOTE WRITE-UP AND SENT ACFT. PROB REAPPEARED LATER. PUMP WAS CHANGED. THIS INCIDENT REVOLVES AROUND A POPPED CIRCUIT BREAKER. NO PRIOR HISTORY AND CREW REST; AND NO FURTHER PROBS. WE HAVE A CIRCUIT BREAKER RESET PROC TO FOLLOW WHICH I FELT I DID. THIS WAS AN INFO NOTED SIGNOFF.
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.