Narrative:

I arrived to preflight aircraft for ZZZ-ZZZ1 revenue service. Maintenance was at aircraft trying to repair the environmental control switching mechanism which they completed and cleared the respective MEL. When they re-powered aircraft, the 'right jetpipe overheat' warning was displayed on EFIS. The mechanic went back to engine cowl and message went away. When he retested it, the message came back. My first officer and I asked the mechanic about the message and he said this was related to a write-up for the 'right fire fail' loop detection system on the right engine. This seemed unusual to my first officer and myself and we discussed it. I was convinced that this system -- the jetpipe overheat loop, was related to the fire loop on that engine based on what the mechanic said. We subsequently departed ZZZ and flew ZZZ1, thinking this was an MEL'ed item the captain wrote up that previously flew the aircraft. The captain who took the aircraft from me in ZZZ1 discovered the discrepancy -- saying this was a separate write-up. It turns out this is a grounding item. I mistakenly relied on the mechanic's expertise to make a go decision as PIC and the 3000 hours the first officer had in type versus my 250 hours.

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Original NASA ASRS Text

Title: A CANADAIR CL600 WAS DISPATCHED IN NON COMPLIANCE WITH THE R ENG TAILPIPE OVERHEAT SYS INOP WARNING LIGHT ON CONTINUOUSLY.

Narrative: I ARRIVED TO PREFLT ACFT FOR ZZZ-ZZZ1 REVENUE SVC. MAINT WAS AT ACFT TRYING TO REPAIR THE ENVIRONMENTAL CTL SWITCHING MECHANISM WHICH THEY COMPLETED AND CLRED THE RESPECTIVE MEL. WHEN THEY RE-POWERED ACFT, THE 'R JETPIPE OVERHEAT' WARNING WAS DISPLAYED ON EFIS. THE MECH WENT BACK TO ENG COWL AND MESSAGE WENT AWAY. WHEN HE RETESTED IT, THE MESSAGE CAME BACK. MY FO AND I ASKED THE MECH ABOUT THE MESSAGE AND HE SAID THIS WAS RELATED TO A WRITE-UP FOR THE 'R FIRE FAIL' LOOP DETECTION SYS ON THE R ENG. THIS SEEMED UNUSUAL TO MY FO AND MYSELF AND WE DISCUSSED IT. I WAS CONVINCED THAT THIS SYS -- THE JETPIPE OVERHEAT LOOP, WAS RELATED TO THE FIRE LOOP ON THAT ENG BASED ON WHAT THE MECH SAID. WE SUBSEQUENTLY DEPARTED ZZZ AND FLEW ZZZ1, THINKING THIS WAS AN MEL'ED ITEM THE CAPT WROTE UP THAT PREVIOUSLY FLEW THE ACFT. THE CAPT WHO TOOK THE ACFT FROM ME IN ZZZ1 DISCOVERED THE DISCREPANCY -- SAYING THIS WAS A SEPARATE WRITE-UP. IT TURNS OUT THIS IS A GNDING ITEM. I MISTAKENLY RELIED ON THE MECH'S EXPERTISE TO MAKE A GO DECISION AS PIC AND THE 3000 HRS THE FO HAD IN TYPE VERSUS MY 250 HRS.

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.