Maintenance Airframe; Maintenance Powerplant
Aircraft Equipment Problem Critical; Ground Event / Encounter Other / Unknown
General Maintenance Action
Chart Or Publication; Human Factors; Manuals; Procedure; Aircraft
I was replacing the Fuel Sump Water Drain Valve because it was leaking. Than; during replacement; the retainer clip failed; allowing fuel to exit the wing; leading up to a minor fuel spill that we were able to contained.
A Mechanic reports that during replacement of a Fuel Sump Drain Valve on an A319 aircraft; the valve retainer clip failed; and allowing fuel to exit the wing. A minor fuel spill occurred in their hangar.