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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An MD90 returned to the gate due to 'left generator off' and 'left power fault' on annunciator panel when autothrottle switch placed to 'on.'
| Attributes | |
| ACN | 648505 |
| Time | |
| Date | 200502 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-90 Series (DC-9-90) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance avionics : 18 maintenance technician : 26 |
| ASRS Report | 648505 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation non adherence : company policies non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : annunciator warning panel other flight crewa other flight crewb |
| Resolutory Action | other |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : repair |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance |
| Primary Problem | Aircraft |
Narrative:
On feb/tue/05; air carrier X returned to gate. Crew did a write-up. At 40 KTS; when autothrottle switch placed 'on;' we got a 'left generator off;' 'left AC power fault' on fault annunciator panel. On the status page we have. 'Left electrical system failure' and 'left eec performance penalty 2.' returned to gate. I met the aircraft at gate. Both engines shut down. Checked fault annunciator panel -- no indications at that time or any message on fault annunciator panel of 'left efc performance penalty 2.' talked to lead mechanic about message. Concluded that since there was no 'left eec performance penalty 2' on fault annunciator panel; it was not a real time fault. I checked the left variable speed constant frequency generator -- oil level ok. No differential pressure or oil filter indicators popped. Crew reported left electrical ok; picked up by #2. Forward to maintenance carryover and placard per MEL 24-21-01A. #1 engine generator inoperative. The fault 'left eec performance penalty 2' did not exist at this time. I should have made it clear in my signoff that no message existed at this time; which I did not.
Original NASA ASRS Text
Title: AN MD90 RETURNED TO THE GATE DUE TO 'L GENERATOR OFF' AND 'L PWR FAULT' ON ANNUNCIATOR PANEL WHEN AUTOTHROTTLE SWITCH PLACED TO 'ON.'
Narrative: ON FEB/TUE/05; ACR X RETURNED TO GATE. CREW DID A WRITE-UP. AT 40 KTS; WHEN AUTOTHROTTLE SWITCH PLACED 'ON;' WE GOT A 'L GENERATOR OFF;' 'L AC POWER FAULT' ON FAULT ANNUNCIATOR PANEL. ON THE STATUS PAGE WE HAVE. 'L ELECTRICAL SYS FAILURE' AND 'L EEC PERFORMANCE PENALTY 2.' RETURNED TO GATE. I MET THE ACFT AT GATE. BOTH ENGS SHUT DOWN. CHKED FAULT ANNUNCIATOR PANEL -- NO INDICATIONS AT THAT TIME OR ANY MESSAGE ON FAULT ANNUNCIATOR PANEL OF 'L EFC PERFORMANCE PENALTY 2.' TALKED TO LEAD MECH ABOUT MESSAGE. CONCLUDED THAT SINCE THERE WAS NO 'L EEC PERFORMANCE PENALTY 2' ON FAULT ANNUNCIATOR PANEL; IT WAS NOT A REAL TIME FAULT. I CHKED THE L VARIABLE SPD CONSTANT FREQ GENERATOR -- OIL LEVEL OK. NO DIFFERENTIAL PRESSURE OR OIL FILTER INDICATORS POPPED. CREW RPTED L ELECTRICAL OK; PICKED UP BY #2. FORWARD TO MAINT CARRYOVER AND PLACARD PER MEL 24-21-01A. #1 ENG GENERATOR INOP. THE FAULT 'L EEC PERFORMANCE PENALTY 2' DID NOT EXIST AT THIS TIME. I SHOULD HAVE MADE IT CLR IN MY SIGNOFF THAT NO MESSAGE EXISTED AT THIS TIME; WHICH I DID NOT.
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.