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Mechanic reports the #1 engine on a B767-200 had three previous egt exceedences on takeoff; or maximum power settings; including possible compressor stall with accel-decel issues on a subsequent check flight. Engine was released/returned to service.
| Attributes | |
| ACN | 802138 |
| Time | |
| Date | 200808 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 802138 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : testing performance deficiency : fault isolation |
| Supplementary | |
| Problem Areas | Company Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
I was assigned to work aircraft X. The night prior; aircraft X went on a check flight that experienced a possible compressor stall and acceleration/deceleration issues. The #1 engine had been boroscoped and I performed a push/pull check on the vsv and vbv cables in which they failed. I then removed and replaced both vsv and vbv push/pull cables; adjusted and rig checked per amm 75-31-03-5 and amm 75-32-02-5 and the procedure was bought off by quality assurance. After the maintenance was performed; the aircraft was taken out for engine run with myself and a lead mechanic. The #1 engine did experience high egt. The lead mechanic consulted with technical services and was given the ok to return to service on a watch. In previous reports; aircraft X had 3 prior egt exceedances on takeoff or maximum power settings before coming to maintenance base.
Original NASA ASRS Text
Title: MECHANIC REPORTS THE #1 ENG ON A B767-200 HAD THREE PREVIOUS EGT EXCEEDENCES ON TKOF; OR MAX POWER SETTINGS; INCLUDING POSSIBLE COMPRESSOR STALL WITH ACCEL-DECEL ISSUES ON A SUBSEQUENT CHECK FLIGHT. ENGINE WAS RELEASED/RETURNED TO SERVICE.
Narrative: I WAS ASSIGNED TO WORK ACFT X. THE NIGHT PRIOR; ACFT X WENT ON A CHK FLT THAT EXPERIENCED A POSSIBLE COMPRESSOR STALL AND ACCELERATION/DECELERATION ISSUES. THE #1 ENG HAD BEEN BOROSCOPED AND I PERFORMED A PUSH/PULL CHK ON THE VSV AND VBV CABLES IN WHICH THEY FAILED. I THEN REMOVED AND REPLACED BOTH VSV AND VBV PUSH/PULL CABLES; ADJUSTED AND RIG CHKED PER AMM 75-31-03-5 AND AMM 75-32-02-5 AND THE PROC WAS BOUGHT OFF BY QUALITY ASSURANCE. AFTER THE MAINT WAS PERFORMED; THE ACFT WAS TAKEN OUT FOR ENG RUN WITH MYSELF AND A LEAD MECH. THE #1 ENG DID EXPERIENCE HIGH EGT. THE LEAD MECH CONSULTED WITH TECHNICAL SVCS AND WAS GIVEN THE OK TO RETURN TO SVC ON A WATCH. IN PREVIOUS RPTS; ACFT X HAD 3 PRIOR EGT EXCEEDANCES ON TKOF OR MAX PWR SETTINGS BEFORE COMING TO MAINT BASE.
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.