A B757 with a terrain warning write-up. Previous station troubleshot problem to #1 flight instrument panel. Part number taken from installed panel and identical part number panel replaced wrong part installed on aircraft a second time.

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Attributes
ACN	705447
Time
Date	200608
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
ASRS Report	705447
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : non compliance with legal requirements performance deficiency : installation
Supplementary
Problem Areas	Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

I was working placarded item -- terrain warning -- EICAS message. No problem was found with the system; but previous station has troubleshoot problem to #1 electronic flight instrument cover panel (ehse). From ipc obtained part # X. I went to the aircraft with this part in hand. The part already installed on aircraft was Y. I incorrectly assumed I had obtained the wrong part for the aircraft. I returned the X to stock; drew out a Y and replaced the ehse with a like part. The correct part was installed before the aircraft flew by next shift amt. Wrong part already on aircraft.

Original NASA ASRS Text

Title: A B757 WITH A TERRAIN WARNING WRITE-UP. PREVIOUS STATION TROUBLESHOT PROB TO #1 FLT INST PANEL. PART NUMBER TAKEN FROM INSTALLED PANEL AND IDENTICAL PART NUMBER PANEL REPLACED WRONG PART INSTALLED ON ACFT A SECOND TIME.

Narrative: I WAS WORKING PLACARDED ITEM -- TERRAIN WARNING -- EICAS MESSAGE. NO PROB WAS FOUND WITH THE SYS; BUT PREVIOUS STATION HAS TROUBLESHOOT PROB TO #1 ELECTRONIC FLT INST COVER PANEL (EHSE). FROM IPC OBTAINED PART # X. I WENT TO THE ACFT WITH THIS PART IN HAND. THE PART ALREADY INSTALLED ON ACFT WAS Y. I INCORRECTLY ASSUMED I HAD OBTAINED THE WRONG PART FOR THE ACFT. I RETURNED THE X TO STOCK; DREW OUT A Y AND REPLACED THE EHSE WITH A LIKE PART. THE CORRECT PART WAS INSTALLED BEFORE THE ACFT FLEW BY NEXT SHIFT AMT. WRONG PART ALREADY ON ACFT.

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.