An MD80 JT8D-209 engine had the wrong ninth stage compressor disc installed.

Attributes
ACN	412984
Time
Date	199808
Day	Thu
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	412984
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	412983
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

In the process of building N2 rack yyz east/south, I installed the improper ninth stage compressor disc off of rack zxx. Somehow the 2 discs were swapped from one rack to another before build-up. Somehow I failed to notice the improper part number and serial number before I installed it. Callback conversation with reporter revealed the following information: the reporter stated the error was caught at engine change in the overhaul dock so the engine never got out on the line. The reporter said the reworked disc was placed on a rack adjacent to the compressor build-up area but not in the correct rack for this engine. The reporter said new procedures have been started which add new markings to the disc and all paperwork stays with the disc.

Original NASA ASRS Text

Title: AN MD80 JT8D-209 ENG HAD THE WRONG NINTH STAGE COMPRESSOR DISC INSTALLED.

Narrative: IN THE PROCESS OF BUILDING N2 RACK YYZ E/S, I INSTALLED THE IMPROPER NINTH STAGE COMPRESSOR DISC OFF OF RACK ZXX. SOMEHOW THE 2 DISCS WERE SWAPPED FROM ONE RACK TO ANOTHER BEFORE BUILD-UP. SOMEHOW I FAILED TO NOTICE THE IMPROPER PART NUMBER AND SERIAL NUMBER BEFORE I INSTALLED IT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ERROR WAS CAUGHT AT ENG CHANGE IN THE OVERHAUL DOCK SO THE ENG NEVER GOT OUT ON THE LINE. THE RPTR SAID THE REWORKED DISC WAS PLACED ON A RACK ADJACENT TO THE COMPRESSOR BUILD-UP AREA BUT NOT IN THE CORRECT RACK FOR THIS ENG. THE RPTR SAID NEW PROCS HAVE BEEN STARTED WHICH ADD NEW MARKINGS TO THE DISC AND ALL PAPERWORK STAYS WITH THE DISC.

Data retrieved from NASA's ASRS site as of July 2007 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.