Narrative:

On dec/fri/05 at XA00 I was assigned to work at air carrier X who has a contract with our company for maintenance work. At XA30 the aircraft arrived in ZZZ and I was told by the flight crew that they had a compass problem. My partner went to the flight deck and checked the logbook and it said #2 HSI had a heading flag stuck. I then informed air carrier X maintenance of the aircraft's situation. They (control) sent some troubleshooting information and we accomplished the procedure. At XC15 we determined that the #1 HSI was faulty. I then called air carrier X maintenance control and told them we needed a #1 HSI. Also; I asked for the part number so I could also try and locate the part also. I called my company parts logistics center and gave them the part number air carrier X gave me. Logistics crossed the part number and came up with a company part number. They told me the part was in ZZZ1 and I would have it in ZZZ at XE15. I then called air carrier X maintenance control and said I had found the part in ZZZ1. They told me to have it sent. I called my company back and verified it was on the way. I then called air carrier X operations in ZZZ and said I found the part but I needed someone to sign for it when it arrived. They said that it needed to be their maintenance manager; but he wasn't there. They said someone from the cargo department would sign for it. At XE00 I arrived with the air carrier X and my partner at company stores. I retrieved the part and checked the number. The number didn't match with the number air carrier X maintenance control had given me. I then went to out computer and inputted the number air carrier X had given me; and it matched the company part number that was on the tagged part. I also inputted the part number on the HSI and it matched the part that was on the svcable tag. I assumed since both part numbers matched; it could be installed on air carrier X aircraft. I then installed the part and operations checked per aircraft maintenance manual. Check was ok. I then sent air carrier X a computer logbook entry of what had been done along with the part numbers and that both part numbers matched in company computer system. I was informed later that the one part number would not be compatible with aircraft X. Note: computer logbook entry sent to air carrier X was made before aircraft departure.

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Original NASA ASRS Text

Title: A B747-200 WAS DISPATCHED WITH THE INCORRECT #1 HORIZ SIT INDICATOR INSTALLED. TECHNICIANS INSTALLING THE PART WERE ASSURED OF CORRECT PART NUMBER AFTER CHKING WITH CARRIER AND TECHNICIAN'S LOGISTICS CTR.

Narrative: ON DEC/FRI/05 AT XA00 I WAS ASSIGNED TO WORK AT ACR X WHO HAS A CONTRACT WITH OUR COMPANY FOR MAINT WORK. AT XA30 THE ACFT ARRIVED IN ZZZ AND I WAS TOLD BY THE FLT CREW THAT THEY HAD A COMPASS PROB. MY PARTNER WENT TO THE FLT DECK AND CHKED THE LOGBOOK AND IT SAID #2 HSI HAD A HDG FLAG STUCK. I THEN INFORMED ACR X MAINT OF THE ACFT'S SIT. THEY (CTL) SENT SOME TROUBLESHOOTING INFO AND WE ACCOMPLISHED THE PROC. AT XC15 WE DETERMINED THAT THE #1 HSI WAS FAULTY. I THEN CALLED ACR X MAINT CTL AND TOLD THEM WE NEEDED A #1 HSI. ALSO; I ASKED FOR THE PART NUMBER SO I COULD ALSO TRY AND LOCATE THE PART ALSO. I CALLED MY COMPANY PARTS LOGISTICS CTR AND GAVE THEM THE PART NUMBER ACR X GAVE ME. LOGISTICS CROSSED THE PART NUMBER AND CAME UP WITH A COMPANY PART NUMBER. THEY TOLD ME THE PART WAS IN ZZZ1 AND I WOULD HAVE IT IN ZZZ AT XE15. I THEN CALLED ACR X MAINT CTL AND SAID I HAD FOUND THE PART IN ZZZ1. THEY TOLD ME TO HAVE IT SENT. I CALLED MY COMPANY BACK AND VERIFIED IT WAS ON THE WAY. I THEN CALLED ACR X OPS IN ZZZ AND SAID I FOUND THE PART BUT I NEEDED SOMEONE TO SIGN FOR IT WHEN IT ARRIVED. THEY SAID THAT IT NEEDED TO BE THEIR MAINT MGR; BUT HE WASN'T THERE. THEY SAID SOMEONE FROM THE CARGO DEPT WOULD SIGN FOR IT. AT XE00 I ARRIVED WITH THE ACR X AND MY PARTNER AT COMPANY STORES. I RETRIEVED THE PART AND CHKED THE NUMBER. THE NUMBER DIDN'T MATCH WITH THE NUMBER ACR X MAINT CTL HAD GIVEN ME. I THEN WENT TO OUT COMPUTER AND INPUTTED THE NUMBER ACR X HAD GIVEN ME; AND IT MATCHED THE COMPANY PART NUMBER THAT WAS ON THE TAGGED PART. I ALSO INPUTTED THE PART NUMBER ON THE HSI AND IT MATCHED THE PART THAT WAS ON THE SVCABLE TAG. I ASSUMED SINCE BOTH PART NUMBERS MATCHED; IT COULD BE INSTALLED ON ACR X ACFT. I THEN INSTALLED THE PART AND OPS CHKED PER ACFT MAINT MANUAL. CHK WAS OK. I THEN SENT ACR X A COMPUTER LOGBOOK ENTRY OF WHAT HAD BEEN DONE ALONG WITH THE PART NUMBERS AND THAT BOTH PART NUMBERS MATCHED IN COMPANY COMPUTER SYS. I WAS INFORMED LATER THAT THE ONE PART NUMBER WOULD NOT BE COMPATIBLE WITH ACFT X. NOTE: COMPUTER LOGBOOK ENTRY SENT TO ACR X WAS MADE BEFORE ACFT DEP.

Data retrieved from NASA's ASRS site as of January 2009 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.