B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 197; Flight Crew Type 12000
Aircraft Equipment Problem Critical
Flight Crew Overcame Equipment Problem
Aircraft
As we turned a base leg to final for the Visual Approach to Runway 28L; I advanced the thrust levers to maintain an assigned altitude of 3000 feet MSL.  I noticed the number two engine was not spooling up to match the number one engine.  After analyzing this problem I determined I could not get the engine to accelerate beyond 52 percent.  We were now on final and I instructed the First Officer to accomplish the Engine Failure in the Landing Configuration Checklist and ensure we could land using flaps 15 on Runway 28L.  We ran the checklist and continued the visual approach. I landed the aircraft with the flaps 15 configuration without any further incident.  The communication between the First Officer and me was perfect; only due to the fact that we had the intercom switches locked into the talk positions.  We discussed later how difficult and dangerous this situation would have been if we had not accomplished this configuration of the intercom system.
[Report narrative contained no additional information]
B737 flight crew reported noting a low thrust condition on #2 engine during approach. Landing was made at reduced flap setting.