After replacing the right engine CSD on an md-80; a mechanic is later informed a loose 'B' nut was f...

Attributes
ACN	817311
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	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	817311
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : manuals contributing factor : briefing performance deficiency : fault isolation performance deficiency : testing
Supplementary
Problem Areas	Aircraft Chart Or Publication Company Maintenance Human Performance
Primary Problem	Aircraft

Narrative:

I learned of the event on dec/xa/08 from my fellow amt who was also involved with this task. In november; I was assigned to aircraft X to change the #2 engine constant speed drive (CSD) and generator. A fellow amt and myself performed all tasks per the maintenance manual. We changed the CSD and generator; serviced the components with oil and pulled the aircraft outside for leak and operations check . I was outside the aircraft by the #2 engine CSD and generator looking for leaks during the engine run. No leaks noted during and after the engine run. After the engine was shut down; I checked the CSD oil level and it was still in the green band. The motor was closed up and the paperwork was completed. I later discovered through my fellow co-worker that amts in ZZZ found a loose b-nut at the CSD oil cooler. We were never informed before our assignment of the reason why the CSD was run dry. It created a false assumption that the CSD was not properly serviced. With a better turnover; we would have looked for other problems and looked at specific locations; instead of just changing the CSD and generator as instructed. We received our job assignment to replace the #2 CSD because it was run dry -- no oil. Never was informed to us as to why there was no oil.

Original NASA ASRS Text

Title: After replacing the right engine CSD on an MD-80; a Mechanic is later informed a loose 'B' nut was found at the CSD oil cooler on the Pratt Whitney JT-8 engine.

Narrative: I learned of the event on Dec/XA/08 from my fellow AMT who was also involved with this task. In November; I was assigned to Aircraft X to change the #2 engine Constant Speed Drive (CSD) and generator. A fellow AMT and myself performed all tasks per the Maintenance Manual. We changed the CSD and Generator; serviced the components with oil and pulled the aircraft outside for leak and operations check . I was outside the aircraft by the #2 engine CSD and generator looking for leaks during the engine run. No leaks noted during and after the engine run. After the engine was shut down; I checked the CSD oil level and it was still in the green band. The motor was closed up and the paperwork was completed. I later discovered through my fellow co-worker that AMTs in ZZZ found a loose B-nut at the CSD oil cooler. We were never informed before our assignment of the reason why the CSD was run dry. It created a false assumption that the CSD was not properly serviced. With a better turnover; we would have looked for other problems and looked at specific locations; instead of just changing the CSD and generator as instructed. We received our job assignment to replace the #2 CSD because it was run dry -- no oil. Never was informed to us as to why there was no oil.

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.

After replacing the right engine CSD on an md-80; a mechanic is later informed a loose 'B' nut was found at the CSD oil cooler on the pratt whitney jt-8 engine.