Narrative:

Departed ZZZ on runway 22R with the ZZZ departure with an altitude of 5;000 ft. Made a normal departure and was given direct ZZZ1 VOR and climb from 6;000 ft to 11;000 ft after a few minutes on our route. Enroute to ZZZ1 VOR at around 9;500 ft; #2 propeller electronic controller light illuminated and the #2 engine went to an overspd condition. At that time; both power levers were in the rating detent and both condition levers were in minimum 850 with mcl selected for the climb. After the propeller electronic controller light illuminated; the #2 propeller speed was steady at 1270; the torque setting was at 72% (that number stands out not positive). All other gauges looked normal. We leveled off at our assigned altitude of 11;000 ft and began with the #2 propeller electronic controller fail checklist. Quickly realizing that the actual problem was a propeller overspeed with agreed to run the propeller overspeed memory items followed by the checklist. I slowed the plane down to 200 KTS and continued to ZZZ1 VOR. The first officer ran the checklist and declared an emergency with ATC. After declaring an emergency; he continued with the checklists and ran the engine shutdown checklist. At this time I was flying the plane south and descending in preparation to landing in ZZZ1. I had the first officer advise company through ZZZ operations that we had declared an emergency and that we would be landing in ZZZ1. After that was completed; I advised the flight attendants that we would be making a controlled emergency landing into ZZZ1 and that we had to shut one engine down. I advised them to prepare the cabin for arrival. At this point; we were around 5;000 ft on a right base leg for ZZZ1 and approximately 15 miles away. I had the first officer prepare his charts for ZZZ1 and to set me up for a visual approach backed up by the ILS to runway. Also; the first officer ran the single engine descent and approach checklists. We made a controlled and normal landing in ZZZ1 and exited to the right off the runway and came to a stop short of taxiway a. I was met by the fire crew and I was in contact with ZZZ1 airport operations. I also made an announcement to the passengers to remain seated; that all was all right with the aircraft; and that we would be pulling in to a gate momentarily. After talking to ZZZ1 operations and determining there was no towbar; I decided to taxi the plane and make a normal shutdown and deplane the aircraft into the terminal.

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Original NASA ASRS Text

Title: A DHC8-400 (Q-400) #2 PEC light illuminated during the climb after takeoff. The propeller oversped and the engine was shut down. An emergency was declared with an emergency landing at a nearby airport.

Narrative: Departed ZZZ on Runway 22R with the ZZZ Departure with an altitude of 5;000 FT. Made a normal departure and was given direct ZZZ1 VOR and climb from 6;000 FT to 11;000 FT after a few minutes on our route. Enroute to ZZZ1 VOR at around 9;500 FT; #2 PROP Electronic Controller light illuminated and the #2 engine went to an overspd condition. At that time; both power levers were in the rating detent and both condition levers were in minimum 850 with MCL selected for the climb. After the Propeller Electronic Controller light illuminated; the #2 propeller speed was steady at 1270; the torque setting was at 72% (that number stands out not positive). All other gauges looked normal. We leveled off at our assigned altitude of 11;000 FT and began with the #2 Propeller Electronic Controller Fail checklist. Quickly realizing that the actual problem was a propeller overspeed with agreed to run the propeller overspeed memory items followed by the checklist. I slowed the plane down to 200 KTS and continued to ZZZ1 VOR. The First Officer ran the checklist and declared an emergency with ATC. After declaring an emergency; he continued with the checklists and ran the engine shutdown checklist. At this time I was flying the plane south and descending in preparation to landing in ZZZ1. I had the First Officer advise company through ZZZ Operations that we had declared an emergency and that we would be landing in ZZZ1. After that was completed; I advised the Flight Attendants that we would be making a controlled emergency landing into ZZZ1 and that we had to shut one engine down. I advised them to prepare the cabin for arrival. At this point; we were around 5;000 FT on a right base leg for ZZZ1 and approximately 15 miles away. I had the First Officer prepare his charts for ZZZ1 and to set me up for a visual approach backed up by the ILS to runway. Also; the First Officer ran the single engine descent and approach checklists. We made a controlled and normal landing in ZZZ1 and exited to the right off the runway and came to a stop short of Taxiway A. I was met by the fire crew and I was in contact with ZZZ1 Airport Operations. I also made an announcement to the passengers to remain seated; that all was all right with the aircraft; and that we would be pulling in to a gate momentarily. After talking to ZZZ1 Operations and determining there was no towbar; I decided to taxi the plane and make a normal shutdown and deplane the aircraft into the terminal.

Data retrieved from NASA's ASRS site as of April 2012 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.