Narrative:

I removed and replaced a #2 CSD and CSD oil cooler that was on MEL on aircraft. After positioning the aircraft for engine run; I asked another mechanic if he would operations check it for me while I was on ground. After engine start; the 'generator off bus light' never illuminated. After engine shutdown; he discovered that the bulb was missing and replaced it. Did another engine start and the light worked along with volts and frequencys. Then performed the generator disconnect. This checked good. Shut down the engine and I reset the CSD. Performed another operations check and it checked good. After shutdown; I resvced the CSD and closed the cowls. We later took the aircraft to the gate and left it. The following morning after engine start the #2 generator would not come on line. The crew returned to the gate and the CSD was placed on MEL once again. This is when it was discovered that I had not followed proper procedure and replaced the generator drive low oil pressure or drive light bulb and the generator drive high oil temperature light bulb as specified in the MEL special procedures. Also when the 3 generator light bulbs were removed during the initial MEL the light covers should have been placarded 'inoperative' per the MEL special procedures and they were not.

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Original NASA ASRS Text

Title: A B737-300 CSD AND OIL COOLER WERE REPLACED TO CORRECT A DEFERRED ITEM. TECHNICIAN FAILED TO INSTALL LOW PRESSURE WARNING AND HIGH TEMP WARNING LIGHT BULBS.

Narrative: I REMOVED AND REPLACED A #2 CSD AND CSD OIL COOLER THAT WAS ON MEL ON ACFT. AFTER POSITIONING THE ACFT FOR ENG RUN; I ASKED ANOTHER MECH IF HE WOULD OPS CHK IT FOR ME WHILE I WAS ON GND. AFTER ENG START; THE 'GENERATOR OFF BUS LIGHT' NEVER ILLUMINATED. AFTER ENG SHUTDOWN; HE DISCOVERED THAT THE BULB WAS MISSING AND REPLACED IT. DID ANOTHER ENG START AND THE LIGHT WORKED ALONG WITH VOLTS AND FREQS. THEN PERFORMED THE GENERATOR DISCONNECT. THIS CHKED GOOD. SHUT DOWN THE ENG AND I RESET THE CSD. PERFORMED ANOTHER OPS CHK AND IT CHKED GOOD. AFTER SHUTDOWN; I RESVCED THE CSD AND CLOSED THE COWLS. WE LATER TOOK THE ACFT TO THE GATE AND LEFT IT. THE FOLLOWING MORNING AFTER ENG START THE #2 GENERATOR WOULD NOT COME ON LINE. THE CREW RETURNED TO THE GATE AND THE CSD WAS PLACED ON MEL ONCE AGAIN. THIS IS WHEN IT WAS DISCOVERED THAT I HAD NOT FOLLOWED PROPER PROC AND REPLACED THE GENERATOR DRIVE LOW OIL PRESSURE OR DRIVE LIGHT BULB AND THE GENERATOR DRIVE HIGH OIL TEMP LIGHT BULB AS SPECIFIED IN THE MEL SPECIAL PROCS. ALSO WHEN THE 3 GENERATOR LIGHT BULBS WERE REMOVED DURING THE INITIAL MEL THE LIGHT COVERS SHOULD HAVE BEEN PLACARDED 'INOP' PER THE MEL SPECIAL PROCS AND THEY WERE NOT.

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.