Narrative:

During climb out of gsp, en route to yip, the right generator light began to flash on and off, and its output was erratic between 50-100 amps. The crew elected to shut the generator off. System voltage and left generator output were at 28 volts and approximately 60 amps, within normal operating range. Shortly thereafter, the right engine oil pressure gauge became erratic between 40-80 psi. Crew looked for second indication, ie, oil pressure light, but did not get it. Crew elected to pull right engine thrust lever to idle. The oil pressure became less erratic but dropped down to 20-40 psi. At this point, ATC needed crew to expedite climb from approximately FL190-FL310. Crew told ATC that it was unable to expedite. ATC replied climb and maintain FL210. Later, crew requested to divert to mor. ATC cleared crew direct. ATC asked what the problem was and crew explained that they were having mechanical irregularities which the crew did not agree with. With the right engine still with low oil pressure indication, crew decided to perform a precautionary shutdown. Crew finished emergency and normal checklists and ATC cleared crew for lower altitudes and vectored crew for approach to mor. Callback conversation with reporter revealed the following information: the reporter stated when on the ground maintenance found a failed generator drive oil seal which allowed the oil pressure to drop but not low enough to close the low oil pressure warning switch. The reporter said the reading on the oil quantity indicator was not noted at the time of engine shutdown.

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Original NASA ASRS Text

Title: A LEAR 25 IN CLB AT FL190 DIVERTED AND SHUT DOWN #2 ENG DUE TO ERRATIC DC GENERATOR OP AND LOW ENG OIL PRESSURE CAUSED BY A FAILED GENERATOR DRIVE SEAL.

Narrative: DURING CLBOUT OF GSP, ENRTE TO YIP, THE R GENERATOR LIGHT BEGAN TO FLASH ON AND OFF, AND ITS OUTPUT WAS ERRATIC BTWN 50-100 AMPS. THE CREW ELECTED TO SHUT THE GENERATOR OFF. SYS VOLTAGE AND L GENERATOR OUTPUT WERE AT 28 VOLTS AND APPROX 60 AMPS, WITHIN NORMAL OPERATING RANGE. SHORTLY THEREAFTER, THE R ENG OIL PRESSURE GAUGE BECAME ERRATIC BTWN 40-80 PSI. CREW LOOKED FOR SECOND INDICATION, IE, OIL PRESSURE LIGHT, BUT DID NOT GET IT. CREW ELECTED TO PULL R ENG THRUST LEVER TO IDLE. THE OIL PRESSURE BECAME LESS ERRATIC BUT DROPPED DOWN TO 20-40 PSI. AT THIS POINT, ATC NEEDED CREW TO EXPEDITE CLB FROM APPROX FL190-FL310. CREW TOLD ATC THAT IT WAS UNABLE TO EXPEDITE. ATC REPLIED CLB AND MAINTAIN FL210. LATER, CREW REQUESTED TO DIVERT TO MOR. ATC CLRED CREW DIRECT. ATC ASKED WHAT THE PROB WAS AND CREW EXPLAINED THAT THEY WERE HAVING MECHANICAL IRREGULARITIES WHICH THE CREW DID NOT AGREE WITH. WITH THE R ENG STILL WITH LOW OIL PRESSURE INDICATION, CREW DECIDED TO PERFORM A PRECAUTIONARY SHUTDOWN. CREW FINISHED EMER AND NORMAL CHKLISTS AND ATC CLRED CREW FOR LOWER ALTS AND VECTORED CREW FOR APCH TO MOR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED WHEN ON THE GND MAINT FOUND A FAILED GENERATOR DRIVE OIL SEAL WHICH ALLOWED THE OIL PRESSURE TO DROP BUT NOT LOW ENOUGH TO CLOSE THE LOW OIL PRESSURE WARNING SWITCH. THE RPTR SAID THE READING ON THE OIL QUANTITY INDICATOR WAS NOT NOTED AT THE TIME OF ENG SHUTDOWN.

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.