A B737-300 FLIGHT CREW NOTICED WHILE APPROACHING 1000 FEET AGL; THE #2 ENGINE REMAINED AT IDLE AND WOULD NOT RESPOND TO THROTTLE INPUTS.

Narrative

INSIDE 1500 FT AGL APCHING 1000 FT AGL THE #2 ENG REMAINED AT IDLE AND WOULD NOT RESPOND TO THROTTLE INPUTS. THE CAPT WAS PF. THE ACFT WAS FULLY CONFIGURED FLAPS 30 DEGS. THE CAPT CONTINUED TO FLY NOTING THAT SOMETHING SEEMED DIFFERENT. I LOOKED AT THE ENG GAUGES AND NOTICED THE #2 ENG WAS AT IDLE PWR WITH THE THROTTLE PUSHED FORWARD OF THE IDLE STOP. I EXPLAINED THE SITUATION TO THE CAPT WHO CONFIRMED WHAT I SAW AND ADVANCED PWR ON THE #1 ENG AND CONTINUED WITH NO OTHER EVENT TO A NORMAL LNDG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THAT ON APPROACH WAS WHEN THEY NOTICED THE #2 ENGINE WOULD NOT RESPOND TO THROTTLE LEVER MOVEMENT. ENGINE REMAINED AT IDLE. NO WARNING LIGHTS DISPLAYED AND ALL THE BASIC SYSTEMS (HYD; OIL; BLEEDS AND ELECTRIC) FUNCTIONED NORMALLY. THIS WAS THEIR SECOND FLIGHT LEG AND HE HAD BEEN USING AUTOTHRUST WITHOUT ANY PROBLEMS UNTIL THEY WERE DESCENDING THROUGH 1500 FEET AGL. HE CONFIGURED THE ACFT FOR A ONE ENGINE OUT LANDING AND ONLY USED THE #1 ENG REVERSER WITHOUT ANY INCIDENT. AFTER ARRIVING AT THE GATE AND DISCUSSING ISSUE WITH MAINT; IT APPEARS THE ENGINE HAD JUST RECENTLY BEEN CHANGED.