Narrative:

After starting the right engine noted an oil bypass annunciation. Although not unusual for the CT7 engine I called our local maintenance control. After advising them that the light illuminated they indicated a mechanic would come out to the aircraft. Shortly thereafter the light extinguished. Since a crew wrote up the right engine oil bypass indication the previous day I felt there may have been some correlation. After another 10 mins waiting I contacted the maintenance coordinator again. This time the coordinator stated that since the light extinguished it was okay. Again this is a nuance of this engine type. No statement had been made in the maintenance log. The central purpose was to receive some advice or guidance on the problem. Elected to depart. Halfway to our destination the right engine oil bypass light illuminated. After following the appropriate procedure we contacted dispatch and maintenance control. Following a brief discussion dispatch indicated they wanted us to return to our starting point. Upon arrival the tone of local maintenance changed 180 degrees. They swear that they had issued a recall of our flight and had asked field services to deplane the passenger. Our flight was on the ground for 40 mins and in contact with the company at all times. No recall was issued.

Related reports:

Google
 

Original NASA ASRS Text

Title: A SAAB 340B WAS DISPATCHED IN NON COMPLIANCE WITH THE R ENG FILTER BYPASS LIGHT INTERMITTENT OP.

Narrative: AFTER STARTING THE R ENG NOTED AN OIL BYPASS ANNUNCIATION. ALTHOUGH NOT UNUSUAL FOR THE CT7 ENG I CALLED OUR LCL MAINT CTL. AFTER ADVISING THEM THAT THE LIGHT ILLUMINATED THEY INDICATED A MECH WOULD COME OUT TO THE ACFT. SHORTLY THEREAFTER THE LIGHT EXTINGUISHED. SINCE A CREW WROTE UP THE R ENG OIL BYPASS INDICATION THE PREVIOUS DAY I FELT THERE MAY HAVE BEEN SOME CORRELATION. AFTER ANOTHER 10 MINS WAITING I CONTACTED THE MAINT COORDINATOR AGAIN. THIS TIME THE COORDINATOR STATED THAT SINCE THE LIGHT EXTINGUISHED IT WAS OKAY. AGAIN THIS IS A NUANCE OF THIS ENG TYPE. NO STATEMENT HAD BEEN MADE IN THE MAINT LOG. THE CENTRAL PURPOSE WAS TO RECEIVE SOME ADVICE OR GUIDANCE ON THE PROB. ELECTED TO DEPART. HALFWAY TO OUR DEST THE R ENG OIL BYPASS LIGHT ILLUMINATED. AFTER FOLLOWING THE APPROPRIATE PROC WE CONTACTED DISPATCH AND MAINT CTL. FOLLOWING A BRIEF DISCUSSION DISPATCH INDICATED THEY WANTED US TO RETURN TO OUR STARTING POINT. UPON ARR THE TONE OF LCL MAINT CHANGED 180 DEGS. THEY SWEAR THAT THEY HAD ISSUED A RECALL OF OUR FLT AND HAD ASKED FIELD SVCS TO DEPLANE THE PAX. OUR FLT WAS ON THE GND FOR 40 MINS AND IN CONTACT WITH THE COMPANY AT ALL TIMES. NO RECALL WAS ISSUED.

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.