A mechanic describes some of the factors that he believes contributed to his installing the wrong fl...

Attributes
ACN	813053
Time
Date	200811
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	813053
Events
Anomaly	aircraft equipment problem : less severe maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : engineering procedure performance deficiency : scheduled maintenance performance deficiency : testing performance deficiency : non compliance with legal requirements performance deficiency : logbook entry
Supplementary
Problem Areas	Chart Or Publication Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

I accomplished engineering order; activation of vertical navigation. It was brought to my attention that planning found I loaded the wrong software on the aircraft; which is step 4 of the engineering order. I accomplished a few aco's in the past and noticed that the software doesn't have an alert number on the tag but it does have a part number on it. So when I was working in the hangar; I opened up the software book and removed the card. Evidently; the card I removed was the performance software. When I was done loading; I verified the part number installed was correct. It was correct according to the disk I had in my hand; but it wasn't correct for the fleet type. I believe that this possibly could have been prevented if the alert number was on the disk or if the part number was listed in step 4 of the engineering order instead of the alert number in step 4A; which is not on the disk. Also; the last step in step 4; is to fill out the table and write down the part number installed. I believe that if the correct part number is listed on the table it would be easier to compare to new uploaded part number in the CDU.

Original NASA ASRS Text

Title: A MECHANIC DESCRIBES SOME OF THE FACTORS THAT HE BELIEVES CONTRIBUTED TO HIS INSTALLING THE WRONG FLEET TYPE VERTICAL NAVIGATION (V-NAV) SOFTWARE ON A B737-300 AIRCRAFT.

Narrative: I ACCOMPLISHED ENGINEERING ORDER; ACTIVATION OF VERT NAV. IT WAS BROUGHT TO MY ATTN THAT PLANNING FOUND I LOADED THE WRONG SOFTWARE ON THE ACFT; WHICH IS STEP 4 OF THE ENGINEERING ORDER. I ACCOMPLISHED A FEW ACO'S IN THE PAST AND NOTICED THAT THE SOFTWARE DOESN'T HAVE AN ALERT NUMBER ON THE TAG BUT IT DOES HAVE A PART NUMBER ON IT. SO WHEN I WAS WORKING IN THE HANGAR; I OPENED UP THE SOFTWARE BOOK AND REMOVED THE CARD. EVIDENTLY; THE CARD I REMOVED WAS THE PERFORMANCE SOFTWARE. WHEN I WAS DONE LOADING; I VERIFIED THE PART NUMBER INSTALLED WAS CORRECT. IT WAS CORRECT ACCORDING TO THE DISK I HAD IN MY HAND; BUT IT WASN'T CORRECT FOR THE FLEET TYPE. I BELIEVE THAT THIS POSSIBLY COULD HAVE BEEN PREVENTED IF THE ALERT NUMBER WAS ON THE DISK OR IF THE PART NUMBER WAS LISTED IN STEP 4 OF THE ENGINEERING ORDER INSTEAD OF THE ALERT NUMBER IN STEP 4A; WHICH IS NOT ON THE DISK. ALSO; THE LAST STEP IN STEP 4; IS TO FILL OUT THE TABLE AND WRITE DOWN THE PART NUMBER INSTALLED. I BELIEVE THAT IF THE CORRECT PART NUMBER IS LISTED ON THE TABLE IT WOULD BE EASIER TO COMPARE TO NEW UPLOADED PART NUMBER IN THE CDU.

Data retrieved from NASA's ASRS site as of May 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.

A mechanic describes some of the factors that he believes contributed to his installing the wrong fleet type vertical navigation (v-nav) software on a B737-300 aircraft.