A B757-200 was dispatched in non compliance with the incorrect digital flight data acquisition unit ...

Attributes
ACN	464320
Time
Date	200002
Day	Sat
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
Experience	maintenance technician : 15
ASRS Report	464320
Person 2
Affiliation	company : air carrier
Function	oversight : supervisor
Qualification	technician : powerplant technician : airframe
Events
Anomaly	aircraft equipment problem : less severe maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : testing performance deficiency : repair performance deficiency : logbook entry performance deficiency : installation performance deficiency : inspection performance deficiency : fault isolation
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Company
Primary Problem	Maintenance Human Performance

Narrative:

On feb/sat/00, I was assigned a work release item for a boeing B757 aircraft. The work item had a maintenance tech service job card requesting that a digital flight data acquisition unit (dfdau) be replaced for troubleshooting purposes. The job card then requested the ACARS be deferred until engine condition monitoring could be verified from engineering. The job card stated that the class control number for the dfdau was wxxxx at our line stock room, the nightly rotable part printout showed a wxxxx was received for this aircraft. I installed the dfdau per maintenance manual. Later I completed the parts tag and used the same class control number from the serviceable part number from the unserviceable number. When I entered the dfdau replacement in the computer, it quizzed me to make sure the part and serial numbers were correct. I selected 'accept current values.' then I contacted maintenance control and told them that the job card for the dfdau replacement was accomplished. Then, per maintenance control, I deferred the ACARS for flight evaluation. The next night ACARS data still was not being received. Maintenance swapped dfdau from a known good system. That's when it was discovered I installed a B767 dfdau onto a B757 aircraft. The dfdau's alignment pins are the same for both aircraft so either dfdau can be installed on either aircraft. Also the bite test for the installed dfdau checked good.

Original NASA ASRS Text

Title: A B757-200 WAS DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT DIGITAL FLT DATA ACQUISITION UNIT INSTALLED.

Narrative: ON FEB/SAT/00, I WAS ASSIGNED A WORK RELEASE ITEM FOR A BOEING B757 ACFT. THE WORK ITEM HAD A MAINT TECH SVC JOB CARD REQUESTING THAT A DIGITAL FLT DATA ACQUISITION UNIT (DFDAU) BE REPLACED FOR TROUBLESHOOTING PURPOSES. THE JOB CARD THEN REQUESTED THE ACARS BE DEFERRED UNTIL ENG CONDITION MONITORING COULD BE VERIFIED FROM ENGINEERING. THE JOB CARD STATED THAT THE CLASS CTL NUMBER FOR THE DFDAU WAS WXXXX AT OUR LINE STOCK ROOM, THE NIGHTLY ROTABLE PART PRINTOUT SHOWED A WXXXX WAS RECEIVED FOR THIS ACFT. I INSTALLED THE DFDAU PER MAINT MANUAL. LATER I COMPLETED THE PARTS TAG AND USED THE SAME CLASS CTL NUMBER FROM THE SERVICEABLE PART NUMBER FROM THE UNSERVICEABLE NUMBER. WHEN I ENTERED THE DFDAU REPLACEMENT IN THE COMPUTER, IT QUIZZED ME TO MAKE SURE THE PART AND SERIAL NUMBERS WERE CORRECT. I SELECTED 'ACCEPT CURRENT VALUES.' THEN I CONTACTED MAINT CTL AND TOLD THEM THAT THE JOB CARD FOR THE DFDAU REPLACEMENT WAS ACCOMPLISHED. THEN, PER MAINT CTL, I DEFERRED THE ACARS FOR FLT EVALUATION. THE NEXT NIGHT ACARS DATA STILL WAS NOT BEING RECEIVED. MAINT SWAPPED DFDAU FROM A KNOWN GOOD SYS. THAT'S WHEN IT WAS DISCOVERED I INSTALLED A B767 DFDAU ONTO A B757 ACFT. THE DFDAU'S ALIGNMENT PINS ARE THE SAME FOR BOTH ACFT SO EITHER DFDAU CAN BE INSTALLED ON EITHER ACFT. ALSO THE BITE TEST FOR THE INSTALLED DFDAU CHKED GOOD.

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.

A B757-200 was dispatched in non compliance with the incorrect digital flight data acquisition unit installed.