Narrative:

I was assigned to work with mr. X on aircraft X. The bow had a overnight check due along with an interior card and an engine temperature tab card. The maintenance report run had 2 items: the forward flight attendant station seatbelts; and the right engine CSD; oil cooler and generator for overheat. My shift starts at XA00 pm; mr. X. At XC00 pm. The aircraft arrived at approximately XB00 pm. While waiting for the aircraft; I looked up the maintenance manual procedures for changing the CSD; oil cooler and generator. I also checked to ensure that the parts were either here or arriving later by aog. The seat part (a snubber) was here; as was the CSD and oil cooler. The generator was arriving later by aog. When the aircraft arrived; I completed the overnight check and most of the interior card. I also inspected the flight attendant seat and found that it had been previously fixed. I then set up a lift truck and gathered the materials and tools needed for the engine work. About XC15; mr. X showed up and I explained what had already been done and what we needed to do. Mr. X finished the interior card while I finished setting up at the engine. Mr. X and I had previously changed a CSD and generator before. So I expected things to go smoothly. I removed the generator and the CSD while mr. X changed the oil cooler. He asked several questions about the oil cooler and why were we changing it. He had not read the maintenance report run nor the maintenance manual procedures; so I handed him the paperwork for the oil cooler and explained why; when a CSD overheats; you change the oil cooler. After removing the CSD; I began to change out the fill ports and drains that don't come with the new unit. Mr. X retrieved the new generator and began getting it ready for installation. While I was readying the CSD; mr. X asked another series of questions. I stopped and answered them. We installed the CSD and generator without much incident (other than the generator mount nuts and washers; which I'll make a suggestion for later). After the installation was completed; we cleaned up the tools and old parts. We then motored the engine for leak check and then ran it. The generator/CSD passed all required tests. We went inside signed off the paperwork and turned in the logbook for review and release. When filling out the paperwork approximately at XJ30 am; manager noticed an unused seal. We looked at the paperwork to see where it would have gone. It was from between the CSD and the engine drive. There were no leaks but to be honest I just cannot remember; hence this report. Suggest more concentration during critical phases of a job; less complacency over co-workers' lack of ambition or knowledge. The mount nuts: they become crushed when torqued. When trying to mount the generator; they often separate; getting lodged between the generator and the CSD mount. The generator weighs about 70 pounds. Frustration and possible injury may be avoided if new nuts were installed or shipped with the new generator. When changing the CSD; I was continually distracted by my co-worker. Found a new seal post aircraft release. Callback conversation with reporter revealed the following information: reporter stated after the CSD/generator change; he has not heard; or seen; any reports of the CSD leaking. He still doesn't know if the o-ring seal was originally installed on the CSD; or he installed it himself and just doesn't remember; or the unit is flying around without the seal. Reporter stated distraction from working with a less experienced mechanic definitely contributed to the situation. Also the CSD and generator mounting nuts he referred to in his report have washers attached to the nut face when new; making the nut/washer installation much easier. If he has to reuse the old nuts; many times the washers will separate from the nut face; or the washers are bent from torquing loads from the previous CSD/gen change; while making the current installation more difficult and time-consu

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Original NASA ASRS Text

Title: After changing the CSD and generator and performing all ground run checks on the right engine of an MD-80; the aircraft is released for service. Mechanic was later shown an unused seal that should have been installed between the CSD and Generator; but can't remember if one was already in place.

Narrative: I was assigned to work with Mr. X on aircraft X. The bow had a overnight check due along with an interior card and an engine temperature tab card. The maintenance report run had 2 items: the forward Flight Attendant station seatbelts; and the right engine CSD; oil cooler and generator for overheat. My shift starts at XA00 PM; Mr. X. at XC00 PM. The aircraft arrived at approximately XB00 PM. While waiting for the aircraft; I looked up the maintenance manual procedures for changing the CSD; oil cooler and generator. I also checked to ensure that the parts were either here or arriving later by AOG. The seat part (a snubber) was here; as was the CSD and oil cooler. The generator was arriving later by AOG. When the aircraft arrived; I completed the overnight check and most of the interior card. I also inspected the Flight Attendant seat and found that it had been previously fixed. I then set up a lift truck and gathered the materials and tools needed for the engine work. About XC15; Mr. X showed up and I explained what had already been done and what we needed to do. Mr. X finished the interior card while I finished setting up at the engine. Mr. X and I had previously changed a CSD and generator before. So I expected things to go smoothly. I removed the generator and the CSD while Mr. X changed the oil cooler. He asked several questions about the oil cooler and why were we changing it. He had not read the maintenance report run nor the maintenance manual procedures; so I handed him the paperwork for the oil cooler and explained why; when a CSD overheats; you change the oil cooler. After removing the CSD; I began to change out the fill ports and drains that don't come with the new unit. Mr. X retrieved the new generator and began getting it ready for installation. While I was readying the CSD; Mr. X asked another series of questions. I stopped and answered them. We installed the CSD and generator without much incident (other than the generator mount nuts and washers; which I'll make a suggestion for later). After the installation was completed; we cleaned up the tools and old parts. We then motored the engine for leak check and then ran it. The generator/CSD passed all required tests. We went inside signed off the paperwork and turned in the logbook for review and release. When filling out the paperwork approximately at XJ30 AM; Manager noticed an unused seal. We looked at the paperwork to see where it would have gone. It was from between the CSD and the engine drive. There were no leaks but to be honest I just cannot remember; hence this report. Suggest more concentration during critical phases of a job; less complacency over co-workers' lack of ambition or knowledge. The mount nuts: they become crushed when torqued. When trying to mount the generator; they often separate; getting lodged between the generator and the CSD mount. The generator weighs about 70 LBS. Frustration and possible injury may be avoided if new nuts were installed or shipped with the new generator. When changing the CSD; I was continually distracted by my co-worker. Found a new seal post aircraft release. Callback conversation with reporter revealed the following information: Reporter stated after the CSD/Generator change; he has not heard; or seen; any reports of the CSD leaking. He still doesn't know if the O-ring seal was originally installed on the CSD; or he installed it himself and just doesn't remember; or the unit is flying around without the seal. Reporter stated distraction from working with a less experienced mechanic definitely contributed to the situation. Also the CSD and generator mounting nuts he referred to in his report have washers attached to the nut face when new; making the nut/washer installation much easier. If he has to reuse the old nuts; many times the washers will separate from the nut face; or the washers are bent from torquing loads from the previous CSD/Gen change; while making the current installation more difficult and time-consu

Data retrieved from NASA's ASRS site as of April 2012 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.