A B737-300 mechanic replaced the first officer's clock with a captain's position type clock.

Attributes
ACN	777001
Time
Date	200803
Local Time Of Day	1801 To 2400
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
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
ASRS Report	777001
Events
Anomaly	maintenance problem : improper maintenance non adherence : published procedure
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : logbook entry performance deficiency : repair performance deficiency : non compliance with legal requirements performance deficiency : installation
Supplementary
Problem Areas	Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Met aircraft for maintenance in ZZZ. Captain reported that the first officer clock upper LCD was inoperative. I picked up a clock at stores and started to remove the clock from the flight deck. Before I started to install the new clock; I remember that I forgot to 'parts effectivity list' the new clock. I called the office by radio and I asked if anyone could do this part for me. Someone answered the radio and asked me for the stock number item. They called me back and then told me that this part was effective for this aircraft; but they did not tell me that this part can only be used for the captain's side and not the first officer's side. A few days later; I came in to work and started to think about the physical difference between the two clocks. One has 3 knobs (captain's side) and the other has 4 knobs (first officer's side). I thought something was wrong and I talked to my lead about it. He told me that part X can only be used on the captain's side; not the first officer's side. We checked history and found out that the clock was changed with the proper effectivity in ZZZ1. I think one contributing factor was the lack of communication between me and my co-workers. I did not tell them which clock I was changing; but on same part they did not ask me which one I was changing.

Original NASA ASRS Text

Title: A B737-300 MECHANIC REPLACED THE FIRST OFFICER'S CLOCK WITH A CAPTAIN'S POSITION TYPE CLOCK.

Narrative: MET ACFT FOR MAINT IN ZZZ. CAPT RPTED THAT THE FO CLOCK UPPER LCD WAS INOP. I PICKED UP A CLOCK AT STORES AND STARTED TO REMOVE THE CLOCK FROM THE FLT DECK. BEFORE I STARTED TO INSTALL THE NEW CLOCK; I REMEMBER THAT I FORGOT TO 'PARTS EFFECTIVITY LIST' THE NEW CLOCK. I CALLED THE OFFICE BY RADIO AND I ASKED IF ANYONE COULD DO THIS PART FOR ME. SOMEONE ANSWERED THE RADIO AND ASKED ME FOR THE STOCK NUMBER ITEM. THEY CALLED ME BACK AND THEN TOLD ME THAT THIS PART WAS EFFECTIVE FOR THIS ACFT; BUT THEY DID NOT TELL ME THAT THIS PART CAN ONLY BE USED FOR THE CAPT'S SIDE AND NOT THE FO'S SIDE. A FEW DAYS LATER; I CAME IN TO WORK AND STARTED TO THINK ABOUT THE PHYSICAL DIFFERENCE BTWN THE TWO CLOCKS. ONE HAS 3 KNOBS (CAPT'S SIDE) AND THE OTHER HAS 4 KNOBS (FO'S SIDE). I THOUGHT SOMETHING WAS WRONG AND I TALKED TO MY LEAD ABOUT IT. HE TOLD ME THAT PART X CAN ONLY BE USED ON THE CAPT'S SIDE; NOT THE FO'S SIDE. WE CHKED HISTORY AND FOUND OUT THAT THE CLOCK WAS CHANGED WITH THE PROPER EFFECTIVITY IN ZZZ1. I THINK ONE CONTRIBUTING FACTOR WAS THE LACK OF COM BTWN ME AND MY CO-WORKERS. I DID NOT TELL THEM WHICH CLOCK I WAS CHANGING; BUT ON SAME PART THEY DID NOT ASK ME WHICH ONE I WAS CHANGING.

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.