Narrative:

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 (first officer) system. After hours of looking for the leak; I determined the leak was coming from the first officer'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/north) 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/north was not the P/north I requested. I asked the clerk what was the part I was given; and I was informed that it was an interchangeable P/north. 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 first officer'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/north) and vendors available for the airframe and powerplant (a/P) mechanic to research if there are any questions about a part.

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Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.