A Line Mechanic working for a contract maintenance vendor at an FBO hangar reports being informed he had replaced a malfunctioning Parking Brake Accumulator on a Dassault Falcon F2000 with an accumulator having a different part number. Maintenance Control had ordered the replacement accumulator but the aircraft manufacturer had noted the discrepancy after the part was returned to the manufacturer.

Narrative

May 2010; I received a call from Mr.'X' stating that a Fractional Jet Operator had contacted him about one of their Dassault Falcon F2000 aircraft having an incorrect Parking Brake Accumulator installed.[Backtracking] to April 2010; a Dassault Falcon 2000 jet was turned over to our company 'XYZ' [for Maintenance]. Aircraft discrepancy was Parking Brake ACCUM (accumulator) light will not extinguish with standby pump. The aircraft was worked on and troubleshot with the assistance of the Fractional Jet's Maintenance Control. After working with their Maintenance Control; they believed that the Parking Brake Accumulator was bad. Maintenance Control then ordered the Parking Brake Accumulator. We did not gain access to the Parking Brake Accumulator and its Part Number (PN). Shipping information was later forwarded to us. We received the Accumulator and verified that the paperwork was good. Aircraft was put into the hanger due to extremely bad weather.After aircraft was put into the hanger; we gained access to the Parking Brake Accumulator. During this process; the FBO advised us we needed to reposition immediately due to tenants arriving without notice. No other hanger space was available. All tools and access panels needed to be gathered together before aircraft reposition. Aircraft was then placed outside. Due to the Maintenance Due-out time; we needed to continue working in the foul weather. Before removing accumulator from aircraft; we compared the two accumulators and both looked physically identical. We removed the old accumulator and proceeded with the installation process. Current Maintenance Manuals were sent to us but no Illustrated Parts Catalog (IPC) was received because the Accumulator was ordered by Maintenance Control.After a complaint was received from the Fractional Jet Operator; we implanted additional procedures to ensure a seamless; high quality level of work. Mr. 'X' and I created a Corrective Action for myself; which includes:(1) We will now always request a current copy of the IPC no matter who submits the order; Maintenance Control or us.(2) We will take pictures of all parts coming off and being installed onto the aircraft. This will allow us to verify that the PN and Serial Numbers (SN) are legible and reverify when preparing paperwork for Return to Service (RTS).(3) Mr. 'X' will implement an eight-hour training session on parts handling and requirements.(4) No matter what the Due-out time is; we will work at a pace that is safe in the current conditions. If needed; we will tell the customer that the due out time needs to be extended.