After performing a Service Check during the night on a B737-900 aircraft; a hangar Mechanic reports dayshift mechanics informed him they had found a shredded glove behind the Number One engine First Stage compressor.

Narrative

One night; I was assigned to perform a Service Check on a B737-900 aircraft. I followed the Service Check Task Card and completed the aircraft walk around. That morning when the first shift mechanics were preparing to take an airplane to the gate they found a shredded glove behind the number one engine; first stage compressor. I honestly cannot explain how I missed that glove. I performed the engine inlet inspection as directed. I looked from the aft of the engine and from the front of the engine. One possible explanation is that maybe [I] focused too much on finding nicks on the edges of the engine blades and not enough on looking behind the blades. Usually I do make sure to find an angle to be able to see behind the blades; but I might not have done that in this case. A small piece of the glove was found in front of the compressor lying in the inlet. When I inspect the inlet I point the flashlight flat on the inlet; looking for indentations in the inlet. Maybe that is not the best angle to shine the light to see a piece of glove in the dark at night. I did perform the task. I did not rush through it. I think that the documentation for the work performed that night will show that I was trying to be very thorough and I found enough discrepancies to keep me busy most of the night. Human error and poor light. Glove was presented to Supervision and maintenance action was taken.