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Mechanic working a B757-200 inbound log gripe for an 'automatic-throttle failed to maintain reference EPR;' failed to set the power switch on the eec maintenance panel back to the normal position. Takeoff roll aborted.
| Attributes | |
| ACN | 789185 |
| Time | |
| Date | 200804 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 789185 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : 1 |
| Resolutory Action | other |
| Consequence | Other |
| Factors | |
| Maintenance | performance deficiency : non compliance with legal requirements performance deficiency : testing |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
Aircraft had an inbound log gripe 'autothrottle failed to maintain reference EPR.' I performed maintenance control display panel test 02 and 10 per maintenance manual X to update deferral with troubleshooting information. Part of this test has you set the power switch on the eec maintenance panel to the alternate position for troubleshooting purposes. This switch never got put back to the normal position. This went unnoticed until takeoff roll; which was aborted. Aircraft did not return to the gate; crew put switch to normal then departed.
Original NASA ASRS Text
Title: MECHANIC WORKING A B757-200 INBOUND LOG GRIPE FOR AN 'AUTO-THROTTLE FAILED TO MAINTAIN REFERENCE EPR;' FAILED TO SET THE POWER SWITCH ON THE EEC MAINT PANEL BACK TO THE NORMAL POSITION. TAKEOFF ROLL ABORTED.
Narrative: ACFT HAD AN INBOUND LOG GRIPE 'AUTOTHROTTLE FAILED TO MAINTAIN REF EPR.' I PERFORMED MAINT CTL DISPLAY PANEL TEST 02 AND 10 PER MAINT MANUAL X TO UPDATE DEFERRAL WITH TROUBLESHOOTING INFO. PART OF THIS TEST HAS YOU SET THE PWR SWITCH ON THE EEC MAINT PANEL TO THE ALTERNATE POS FOR TROUBLESHOOTING PURPOSES. THIS SWITCH NEVER GOT PUT BACK TO THE NORMAL POS. THIS WENT UNNOTICED UNTIL TKOF ROLL; WHICH WAS ABORTED. ACFT DID NOT RETURN TO THE GATE; CREW PUT SWITCH TO NORMAL THEN DEPARTED.
Data retrieved from NASA's ASRS site as of May 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.