Beech 1900
Maintenance Airframe; Maintenance Powerplant
Situational Awareness; Confusion; Communication Breakdown; Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Manuals; Logbook Entry; MEL; Aircraft; Chart Or Publication; Equipment / Tooling; Human Factors; Incorrect / Not Installed / Unavailable Part
I was troubleshooting a Raytheon Beechcraft 1900-D Transponder Number 2 MEL; when I found that there was a pitot static leak in the First Officer's (FO) System. After hours of looking for the leak; I determined the leak was coming from the FO's Airspeed Indicator (A/I). From that point I went to the Beech 1900D Maintenance Manual (M/M) to find the Airspeed Indicator Part Number (P/N) for the aircraft. Once the Part Number was located; I filled out a Parts Request Form and took it to the Part's Department for issue. When I was handed the new airspeed indicator I noticed that the P/N was not the P/N I requested. I asked the Clerk what was the part I was given; and I was informed that it was an interchangeable P/N. At that point I asked the Clerk how do we really know that it is interchangeable and I was told that the computer automatically pulls up the interchangeable Part Numbers that we use. So at that point I took the Airspeed Indicator to the aircraft and compared it to the faulty airspeed indicator and everything seemed to match. At this time I installed the new [Airspeed] Indicator on the FO's side. After performing all the necessary Pitot/Static and L6000 [Transponder] Tests successfully; I cleaned up my area and cleared the Number 2 Transponder MEL and opened and closed a Write-up for the faulty Airspeed Indicator. Later I was informed that the white arc on the face of the Airspeed Indicator was not correct for that Aircraft. I think the best way to prevent this from happening again would be to make a list of alternate Part Numbers (P/N) and vendors available for the Airframe and Powerplant (A/P) Mechanic to research if there are any questions about a part.
An Aircraft Maintenance Technician (AMT) was informed that a white arc on the face of an Airspeed Indicator (A/I) he had installed at the First Officer's (F/O) position; was not correct for a Beechcraft 1900-D aircraft. Their Parts Department had previously assured Technician their computer system automatically pulls up correct interchangeable part numbers.