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A B757-200 was returned to service with the takeoff warning horn circuit breakers not reset after engine run. Discovered by flight crew.
| Attributes | |
| ACN | 687309 |
| Time | |
| Date | 200603 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 18 |
| ASRS Report | 687309 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : no aural warning on test other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : engineering procedure contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance performance deficiency : testing |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Environmental Factor Chart Or Publication Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
In reference to aircraft XXX; crew reported aural warning circuit breakers out on preflight. I was informed of this on monday night XA30; feb/mon/06; when I returned to work. I was doing a #2 engine vibration run for manufacturer engineer on feb/fri/06. These are high power runs and rather than listening to the takeoff warning horn for 3-4 mins; it is common to pull the aural warning circuit breakers just after engine start to make it easier to communication in the cockpit. I do recall pulling and resetting these circuit breakers for the first engine runs. I did not pull the circuit breakers for the second engine run but they must have been out because there was no horn. I was the only B757 taxi/run and was assigned to the aircraft that night and I got focused on trying to find the propulsion engineer before he went home; because he had the only copy of the engine change run procedure and analysis and I needed it to complete the paperwork.
Original NASA ASRS Text
Title: A B757-200 WAS RETURNED TO SVC WITH THE TKOF WARNING HORN CIRCUIT BREAKERS NOT RESET AFTER ENG RUN. DISCOVERED BY FLT CREW.
Narrative: IN REF TO ACFT XXX; CREW RPTED AURAL WARNING CIRCUIT BREAKERS OUT ON PREFLT. I WAS INFORMED OF THIS ON MONDAY NIGHT XA30; FEB/MON/06; WHEN I RETURNED TO WORK. I WAS DOING A #2 ENG VIBRATION RUN FOR MANUFACTURER ENGINEER ON FEB/FRI/06. THESE ARE HIGH PWR RUNS AND RATHER THAN LISTENING TO THE TKOF WARNING HORN FOR 3-4 MINS; IT IS COMMON TO PULL THE AURAL WARNING CIRCUIT BREAKERS JUST AFTER ENG START TO MAKE IT EASIER TO COM IN THE COCKPIT. I DO RECALL PULLING AND RESETTING THESE CIRCUIT BREAKERS FOR THE FIRST ENG RUNS. I DID NOT PULL THE CIRCUIT BREAKERS FOR THE SECOND ENG RUN BUT THEY MUST HAVE BEEN OUT BECAUSE THERE WAS NO HORN. I WAS THE ONLY B757 TAXI/RUN AND WAS ASSIGNED TO THE ACFT THAT NIGHT AND I GOT FOCUSED ON TRYING TO FIND THE PROPULSION ENGINEER BEFORE HE WENT HOME; BECAUSE HE HAD THE ONLY COPY OF THE ENG CHANGE RUN PROC AND ANALYSIS AND I NEEDED IT TO COMPLETE THE PAPERWORK.
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.