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Widebody transport aircraft engine indicates high vibration above limits on departure out of cle. Flight crew flies aircraft with high vibration only to shut the engine down on last flight.
| Attributes | |
| ACN | 342933 |
| Time | |
| Date | 199607 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : cle |
| State Reference | OH |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff ground : preflight ground other : taxi |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : instrument pilot : cfi pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 100 flight time total : 2300 flight time type : 60 |
| ASRS Report | 342933 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
This occurrence happened on the morning of jul/xx/96, departing cle. It was a ferry flight to position the aircraft in north carolina for a charter. Shortly after takeoff leaving 2000 ft both engine vibration channels (avm) for #3 engine indicated 3.5, the limit maximum allowable indication for operation is 2.5. Instead of following the prescribed procedure: throttle idle, fuel and ignition off, we decided to troubleshoot. The rest of engine parameters were indicating normal and there was no airframe vibration. The throttle for engine #3 was retarded to idle and after a min reapplied, the engine resumed normal operation with avm readings of 0.9. The flight to north carolina was uneventful. After an inspection and cleaning of both avm channels we departed with a line charter flight. That flight as well was uneventful. The last flight of the day was again a ferry flight to repos the aircraft. On the last flight the avm repeated the indications leaving cle and the engine this time was secured.
Original NASA ASRS Text
Title: WDB ACFT ENG INDICATES HIGH VIBRATION ABOVE LIMITS ON DEP OUT OF CLE. FLC FLIES ACFT WITH HIGH VIBRATION ONLY TO SHUT THE ENG DOWN ON LAST FLT.
Narrative: THIS OCCURRENCE HAPPENED ON THE MORNING OF JUL/XX/96, DEPARTING CLE. IT WAS A FERRY FLT TO POS THE ACFT IN NORTH CAROLINA FOR A CHARTER. SHORTLY AFTER TKOF LEAVING 2000 FT BOTH ENG VIBRATION CHANNELS (AVM) FOR #3 ENG INDICATED 3.5, THE LIMIT MAX ALLOWABLE INDICATION FOR OP IS 2.5. INSTEAD OF FOLLOWING THE PRESCRIBED PROC: THROTTLE IDLE, FUEL AND IGNITION OFF, WE DECIDED TO TROUBLESHOOT. THE REST OF ENG PARAMETERS WERE INDICATING NORMAL AND THERE WAS NO AIRFRAME VIBRATION. THE THROTTLE FOR ENG #3 WAS RETARDED TO IDLE AND AFTER A MIN REAPPLIED, THE ENG RESUMED NORMAL OP WITH AVM READINGS OF 0.9. THE FLT TO NORTH CAROLINA WAS UNEVENTFUL. AFTER AN INSPECTION AND CLEANING OF BOTH AVM CHANNELS WE DEPARTED WITH A LINE CHARTER FLT. THAT FLT AS WELL WAS UNEVENTFUL. THE LAST FLT OF THE DAY WAS AGAIN A FERRY FLT TO REPOS THE ACFT. ON THE LAST FLT THE AVM REPEATED THE INDICATIONS LEAVING CLE AND THE ENG THIS TIME WAS SECURED.
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.