Narrative:

I removed and replaced the compressor outlet sensor on a B757-200 located in the right air conditioning package to correct the problem reported in the log as a compressor outlet sensor bite fail. Since the work has been completed; it has come to my attention that the seal I installed on the new sensor may have been the incorrect type. It was noticed that on the night the work was done that the incorrect seal was ordered. I ordered the correct seal recommended on the log page and maintenance parts screen from stock; however; the new sensor came with a new seal attached. I installed the sensor with the seal that was received with the new sensor from the manufacturer. I have been notified that the seal attached to these sensors in the past have been the wrong seal type. I am writing this report to notify maintenance that this is an illustrated parts catalog (ipc) 21-51-06 item. I am told that maintenance control made the discovery during a routine records review and notified me. The new sensor was received with a new seal attached. It appears that in the past; there have been problems with seals being the wrong type packaged with the replacement part. Both the seal attached to the new sensor from the manufacturer and the correct part when ordered from stock appears to be the same part physically. At this time our computer system does not show that any action has been taken under air traffic area 21. In order to prevent this problem in the future I think it would be useful to remove any seals issued with the air conditioning package compressor outlet sensors from the manufacturer before being issued to a work package for an aircraft. In addition; I believe that it may be useful to note the condition in the ipc both at the sensor and seal locations.

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Original NASA ASRS Text

Title: A Mechanic reported installing a new seal with a new sensor to correct a B757-200 Air Conditioning Compressor Outlet logbook Write-up. The new seal that came packaged with the new sensor was later determined to be an incorrect type.

Narrative: I removed and replaced the compressor outlet sensor on a B757-200 located in the right air conditioning package to correct the problem reported in the log as a compressor outlet sensor bite fail. Since the work has been completed; it has come to my attention that the seal I installed on the new sensor may have been the incorrect type. It was noticed that on the night the work was done that the incorrect seal was ordered. I ordered the correct seal recommended on the log page and maintenance parts screen from stock; however; the new sensor came with a new seal attached. I installed the sensor with the seal that was received with the new sensor from the manufacturer. I have been notified that the seal attached to these sensors in the past have been the wrong seal type. I am writing this report to notify Maintenance that this is an Illustrated Parts Catalog (IPC) 21-51-06 item. I am told that Maintenance Control made the discovery during a routine records review and notified me. The new sensor was received with a new seal attached. It appears that in the past; there have been problems with seals being the wrong type packaged with the replacement part. Both the seal attached to the new sensor from the manufacturer and the correct part when ordered from stock appears to be the same part physically. At this time our computer system does not show that any action has been taken under ATA 21. In order to prevent this problem in the future I think it would be useful to remove any seals issued with the air conditioning package compressor outlet sensors from the manufacturer before being issued to a work package for an aircraft. In addition; I believe that it may be useful to note the condition in the IPC both at the sensor and seal locations.

Data retrieved from NASA's ASRS site as of April 2012 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.