A Mechanic and Inspector report about a Pilot finding a fuel leak in the left wing of a B737-300 during his preflight at the #2 slat inboard track can. A washer was found in the slat can.
Synopsis
A Mechanic and Inspector report about a Pilot finding a fuel leak in the left wing of a B737-300 during his preflight at the #2 slat inboard track can. A washer was found in the slat can.
Narrative
Aircraft came in for a B/C Check. I and two fellow Mechanics were assigned left wing. That night we had a down stop inspection on leading edge slat tracks. During the Inspector's inspection; he found #2 slat inboard (INBD) track down-stop locator installed incorrectly. So after gathering the parts; we proceeded to change the locator per Maintenance Manual (MM). Myself and another Mechanic removed and replaced the locator per Maintenance Manual. We are 100% confident that maintenance was 100% compliant when we got done per Maintenance Manual and Inspection.I was informed that on pre-flight inspection; the Pilot found a fuel leak on the left wing. After further investigation; it was found that the #2 slat inboard track can had a puncture. After they removed the slat they found a suspect washer in the slat track that possibly could have punctured the can. The washer found had nothing to do with the down-stop locator we changed. Once again we feel 100% confident that there was nothing we did wrong that could have punctured the slat track can the way it did.
Second reporter narrative
I performed a slat track Down-Stop Inspection. I found the # 2 inboard slat track Down-Stop Locator installed wrong. I created a Non-Routine Card for hardware installed wrong. The Mechanics replaced the Locator. I re-inspected the # 2 inboard slat and can for damage and debris. I found no defects or debris in the slat can and completed the Inspection and Non-Routine Card. A Pilot found a fuel leak on the left wing leading edge outboard of the # 1 engine. Contract Maintenance personnel traced it back to the # 2 inboard slat can. Upon removal of the # 2 inboard slat can; Maintenance personnel found a chamfered washer in the slat can. Damage was found on the upper surface/opening of the slat can. The washer found was not associated with the work performed by myself or the Mechanics that replaced the Locator. The washer found belongs to the slat track roller build-up; which was not removed during my Inspection or Maintenance performed. No slat track rollers were removed while performing or repairing the Locator.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.