 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A B767-400ER was dispatched overwater after left generator maintenance. Later discovered that inbound fault codes required integrated drive generator replacement.
| Attributes | |
| ACN | 626493 |
| Time | |
| Date | 200408 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767-400 and 400 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 31 |
| ASRS Report | 626493 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician oversight : coordinator |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : eicas warning other other : 2 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Chart Or Publication Maintenance Human Performance Aircraft |
| Primary Problem | Chart Or Publication |
| Situations | |
| Publication | Fault Information Manual |
Narrative:
Flight ZZZ on aug/sat/04, diverted with a left generator drive light and was subsequently disconnected by the flight crew. I corrected the problem by interrogating the bpcu (bus power control unit) and replaced the gcu (generator control unit). The fault codes were 24355-01 and 24314-11 with probable causes idg and gcu. I replaced the gcu from stock per maintenance manual and had the pilot run the engine and successfully checked it out. I performed an ETOPS predep check and dispatched the aircraft. The maintenance coordinator discovered that the fault codes generated, required an idg replacement. After several flts with no problems the aircraft was scheduled for an idg replacement precautionary on aug/mon/04. I am disclosing this because there was an oversight between the fim (fault information manual) and the bpcu (bus power control unit).
Original NASA ASRS Text
Title: A B767-400ER WAS DISPATCHED OVERWATER AFTER L GENERATOR MAINT. LATER DISCOVERED THAT INBOUND FAULT CODES REQUIRED INTEGRATED DRIVE GENERATOR REPLACEMENT.
Narrative: FLT ZZZ ON AUG/SAT/04, DIVERTED WITH A L GENERATOR DRIVE LIGHT AND WAS SUBSEQUENTLY DISCONNECTED BY THE FLT CREW. I CORRECTED THE PROB BY INTERROGATING THE BPCU (BUS PWR CTL UNIT) AND REPLACED THE GCU (GENERATOR CTL UNIT). THE FAULT CODES WERE 24355-01 AND 24314-11 WITH PROBABLE CAUSES IDG AND GCU. I REPLACED THE GCU FROM STOCK PER MAINT MANUAL AND HAD THE PLT RUN THE ENG AND SUCCESSFULLY CHKED IT OUT. I PERFORMED AN ETOPS PREDEP CHK AND DISPATCHED THE ACFT. THE MAINT COORDINATOR DISCOVERED THAT THE FAULT CODES GENERATED, REQUIRED AN IDG REPLACEMENT. AFTER SEVERAL FLTS WITH NO PROBS THE ACFT WAS SCHEDULED FOR AN IDG REPLACEMENT PRECAUTIONARY ON AUG/MON/04. I AM DISCLOSING THIS BECAUSE THERE WAS AN OVERSIGHT BTWN THE FIM (FAULT INFO MANUAL) AND THE BPCU (BUS PWR CTL UNIT).
Data retrieved from NASA's ASRS site as of July 2007 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.