B737-700
Maintenance Airframe; Maintenance Powerplant
Maintenance Technician 3
Situational Awareness
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Incorrect / Not Installed / Unavailable Part; Human Factors; Company Policy; Aircraft; Procedure
June 2013; [during the] aircraft's Servce Visit; the left aft (L2) cabin door slide was changed. In October 2013; the aircraft was in a Base Maintenance for scheduled maintenance. It was during this visit on Task Card sequence XXX; that Maintenance personnel found the wrong slide was previously installed at the L2 position. The slide was removed and replaced without incident. It was after this change that I was made aware of the error that resulted in the wrong slide being installed. The correct Part Number (P/N) per the Illustrated Parts Catalog (IPC) is XXX88-YYY; for the aft [door] position.  The Part Number that was installed was XXX86-YYY; which corresponds to a forward [door] position. This was an unintentional error that occured from what I believe to be a key stroke error when ordering the part.
A Line Aircraft Maintenance Technician (AMT) was informed about an incorrect slide he had installed on a B737-700 aircraft approximately four months earlier. He had replaced the aft Cabin (L2) door slide with a forward door slide.