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A BA4100 in cruise at 14000 ft declared an emergency and diverted due to fluctuating RPM on the right engine caused by a defective monopole electrical harness.
| Attributes | |
| ACN | 423275 |
| Time | |
| Date | 199812 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cfb |
| State Reference | NY |
| Altitude | msl bound lower : 14000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 41 |
| Flight Phase | cruise other other other |
| Route In Use | enroute airway : zny |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | other other : other pilot : cfi pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 3800 flight time type : 1300 |
| ASRS Report | 423275 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
Narrative:
En route from jfk to roc the aircraft's right engine developed abnormal RPM fluctuations. The right engine RPM abnormally fluctuated +/- 30%. Shut right engine down per the emergency/abnormal checklist. Declared an emergency with center and the flight landed safely at bgm without incident. Callback conversation with reporter revealed the following information: the reporter stated the engine was an ASE331-14GR/hour and company procedures require the engine to be shut down if the RPM fluctuates greater than 7.5%. The reporter said all other engine indications were normal and the fluctuations were caused by a defective electrical harness on the engine sensor or monopole.
Original NASA ASRS Text
Title: A BA4100 IN CRUISE AT 14000 FT DECLARED AN EMER AND DIVERTED DUE TO FLUCTUATING RPM ON THE R ENG CAUSED BY A DEFECTIVE MONOPOLE ELECTRICAL HARNESS.
Narrative: ENRTE FROM JFK TO ROC THE ACFT'S R ENG DEVELOPED ABNORMAL RPM FLUCTUATIONS. THE R ENG RPM ABNORMALLY FLUCTUATED +/- 30%. SHUT R ENG DOWN PER THE EMER/ABNORMAL CHKLIST. DECLARED AN EMER WITH CTR AND THE FLT LANDED SAFELY AT BGM WITHOUT INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ENG WAS AN ASE331-14GR/HR AND COMPANY PROCS REQUIRE THE ENG TO BE SHUT DOWN IF THE RPM FLUCTUATES GREATER THAN 7.5%. THE RPTR SAID ALL OTHER ENG INDICATIONS WERE NORMAL AND THE FLUCTUATIONS WERE CAUSED BY A DEFECTIVE ELECTRICAL HARNESS ON THE ENG SENSOR OR MONOPOLE.
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.