Narrative:

We had a boeing 777-300 come in with an inoperative idg (integrated drive generator); bug (back-up generator); and starter all on the same engine number 1 - left engine. The bug was replaced and the plane was going to be [ferried] with the idg placed on MEL; but when we tried to run the left engine; the engine would not start. We discovered that the starter had also failed. So; the plane remained at ZZZ.when I came back to work that night; two technicians had installed an idg borrowed from [another company]. Management wanted me to signoff the work of the other technicians; but I refused. I told the technicians to enter what they did into the logbook and state that they installed the idg per the amm (aircraft maintenance manual) and to include that they installed the idg; then I would sign the release. I left to work the outbound flight. When I returned to the east hangar; no entry was done in the logbook; so I told the company's management that I would redo to entire job and remove the idg. Which I did.during the idg removal; the [the customer company's] manager stated that he had a new idg o-ring. I told them to give it to me. I noticed amm had a caution; which stated that we should only use one o-ring; which was compatible with hts 2197 oil. The other o-rings were non-hts compatible and would result in reduced o-ring life; oil leakage; and potential engine shutdown due to oil loss. [The manager] gave me the wrong o-ring. I told him; you gave me the wrong o-ring; look at the amm. He got upset and told me to look at the ipc (illustrated parts catalog). I told him to look at the amm and read the caution because we were using 2197 oil. He said the idg was a borrowed part from [another company] and that it was only going to be for one flight. I told him the amm doesn't say it's ok for one flight. He tried to insist; but I refused to listen to his argument. He said he would order a new o-ring; and now he wouldn't talk to me anymore; and I said that's ok with me. He wanted us to start working on the starter; but I told my partner that we are not going to jump from one job into another job; then move back to the idg and possibly forget something. [The company] had the correct o-ring; and the idg installation was completed.I could have just walk off that job and told him I didn't want to work for [the customer] anymore. This is just too much pressure and stress to be put under and it's an accident waiting to happen. My partner was there when this happened. I did all the talking with the maintenance manager. I should have filed a tsap that day.

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Original NASA ASRS Text

Title: A Maintenance Technician working on a B777 was asked to install an incorrect part number seal by a customer representative.

Narrative: We had a Boeing 777-300 come in with an inoperative IDG (Integrated Drive Generator); BUG (Back-up Generator); and Starter all on the same Engine Number 1 - Left Engine. The BUG was replaced and the plane was going to be [ferried] with the IDG placed on MEL; but when we tried to run the Left Engine; the engine would not start. We discovered that the starter had also failed. So; the plane remained at ZZZ.When I came back to work that night; two technicians had installed an IDG borrowed from [another company]. Management wanted me to signoff the work of the other technicians; but I refused. I told the technicians to enter what they did into the logbook and state that they installed the IDG per the AMM (Aircraft Maintenance Manual) and to include that they installed the IDG; then I would sign the release. I left to work the outbound flight. When I returned to the east hangar; no entry was done in the logbook; so I told the company's management that I would redo to entire job and remove the IDG. Which I did.During the IDG removal; the [the customer company's] manager stated that he had a new IDG O-ring. I told them to give it to me. I noticed AMM had a caution; which stated that we should only use one O-ring; which was compatible with HTS 2197 oil. The other O-rings were non-HTS compatible and would result in reduced O-ring life; oil leakage; and potential engine shutdown due to oil loss. [The manager] gave me the wrong O-ring. I told him; you gave me the wrong O-ring; Look at the AMM. He got upset and told me to look at the IPC (Illustrated Parts Catalog). I told him to look at the AMM and read the caution because we were using 2197 oil. He said the IDG was a borrowed part from [another company] and that it was only going to be for one flight. I told him the AMM doesn't say it's ok for one flight. He tried to insist; but I refused to listen to his argument. He said he would order a new O-ring; and now he wouldn't talk to me anymore; and I said that's ok with me. He wanted us to start working on the starter; but I told my partner that we are not going to jump from one job into another job; then move back to the IDG and possibly forget something. [The company] had the correct O-ring; and the IDG installation was completed.I could have just walk off that job and told him I didn't want to work for [the customer] anymore. This is just too much pressure and stress to be put under and it's an accident waiting to happen. My partner was there when this happened. I did all the talking with the Maintenance Manager. I should have filed a TSAP that day.

Data retrieved from NASA's ASRS site 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.