B737-800
Maintenance Airframe; Maintenance Powerplant
Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Procedure; Aircraft; Human Factors
I work midnight shift at ZZZ airport. On the night I was assigned an A-Check on a B737-800. I performed the General Visual (G/V) walk around inspection on the aircraft. I was informed later on; that an area of corrosion was found on the left aft side of the fuselage; just aft of the lav motor exhaust port. I do not recall noticing evidence of corrosion on my walk around. I started the inspection at the nose of the aircraft and walked down the right side inspecting the fuselage; engine; wing; and gear; around the tail and continued on the left side inspecting fuselage; wing; engine; and gear. Conditions at the time were dark since I work midnight shift and the area of concern was painted gray. I performed my walk around using my flashlight. [Line] Gate.
A Line Aircraft Maintenance Technician (AMT) was informed that corrosion was found on the lower aft fuselage skin; just aft of the Lavatory Motor exhaust port on a B737-800 aircraft. He had previously accomplished an A-Check and walk around inspection on midnight shift using a flashlight.