Narrative:

#2 engine thrust reverser indicated an unlocked condition on initial climb from msy. Crew referred to appropriate checklist, retarded #2 engine to idle and reduced airspeed to 200 KTS. Notified ATC of intent to return to msy and land. No abnormal engine or control problems. Crew elected to keep engine running versus shutting it down. Captain notified maintenance via atl radio and advised them that we had what appeared to be a faulty indication on the #2 engine thrust reverser and that we intended to keep the engine running at idle power and return to msy and land. Maintenance did not concur with our decision and stated that the entire thrust reverser unlock procedure should be accomplished even though there was no physical indication of a problem. The captain and I discussed the situation and reluctantly complied and shut down the #2 engine. All single engine checklists were accomplished, an emergency was declared, and an uneventful single engine approach and landing was accomplished to runway 10 at msy. All passenger deplaned at the gate without incident. Maintenance at msy subsequently inspected the #2 reverser which was stowed. Discussion: no airspace or altdevs occurred, and there were no conflicts with other traffic. WX was not a factor. Msy approach handled the situation very well and most expeditiously. Main problem was conflict between the crew's desire to keep the engine running and maintenance insistence that the entire procedure (ie, engine shutdown) be accomplished. This procedure needs to be reviewed for the CL65 and emphasized that the engine not be shut down if there are no abnormal indications. Maintenance and the crews need to be on the same sheet of music!

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Original NASA ASRS Text

Title: A CL65 DECLARED AN EMER AND RETURNED TO THE FIELD DUE TO #2 ENG REVERSER UNLOCK LIGHT ILLUMINATED ON INITIAL CLB. ENG SHUTDOWN.

Narrative: #2 ENG THRUST REVERSER INDICATED AN UNLOCKED CONDITION ON INITIAL CLB FROM MSY. CREW REFERRED TO APPROPRIATE CHKLIST, RETARDED #2 ENG TO IDLE AND REDUCED AIRSPD TO 200 KTS. NOTIFIED ATC OF INTENT TO RETURN TO MSY AND LAND. NO ABNORMAL ENG OR CTL PROBS. CREW ELECTED TO KEEP ENG RUNNING VERSUS SHUTTING IT DOWN. CAPT NOTIFIED MAINT VIA ATL RADIO AND ADVISED THEM THAT WE HAD WHAT APPEARED TO BE A FAULTY INDICATION ON THE #2 ENG THRUST REVERSER AND THAT WE INTENDED TO KEEP THE ENG RUNNING AT IDLE PWR AND RETURN TO MSY AND LAND. MAINT DID NOT CONCUR WITH OUR DECISION AND STATED THAT THE ENTIRE THRUST REVERSER UNLOCK PROC SHOULD BE ACCOMPLISHED EVEN THOUGH THERE WAS NO PHYSICAL INDICATION OF A PROB. THE CAPT AND I DISCUSSED THE SIT AND RELUCTANTLY COMPLIED AND SHUT DOWN THE #2 ENG. ALL SINGLE ENG CHKLISTS WERE ACCOMPLISHED, AN EMER WAS DECLARED, AND AN UNEVENTFUL SINGLE ENG APCH AND LNDG WAS ACCOMPLISHED TO RWY 10 AT MSY. ALL PAX DEPLANED AT THE GATE WITHOUT INCIDENT. MAINT AT MSY SUBSEQUENTLY INSPECTED THE #2 REVERSER WHICH WAS STOWED. DISCUSSION: NO AIRSPACE OR ALTDEVS OCCURRED, AND THERE WERE NO CONFLICTS WITH OTHER TFC. WX WAS NOT A FACTOR. MSY APCH HANDLED THE SIT VERY WELL AND MOST EXPEDITIOUSLY. MAIN PROB WAS CONFLICT BTWN THE CREW'S DESIRE TO KEEP THE ENG RUNNING AND MAINT INSISTENCE THAT THE ENTIRE PROC (IE, ENG SHUTDOWN) BE ACCOMPLISHED. THIS PROC NEEDS TO BE REVIEWED FOR THE CL65 AND EMPHASIZED THAT THE ENG NOT BE SHUT DOWN IF THERE ARE NO ABNORMAL INDICATIONS. MAINT AND THE CREWS NEED TO BE ON THE SAME SHEET OF MUSIC!

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.