Narrative:

I was assigned to a crj -200 aircraft on a december 2009 night with mechanic 'X' and mechanic 'Y'. Mechanic 'Y' worked on the service check. Mechanic 'X' chose the left engine and I worked the right engine. I did igniter inspection and starter oils. I went to the left engine and helped mechanic pull the idg off the engine. Removed idg carbon seal; found broken. Found carbon seal on gearbox deteriorated. Asked the lead to please order parts for gearbox. Helped mechanic 'X' with the idg carbon seal. Found parts that lead got were the wrong modification. The parts were for a two piece pre-modification seal; which is obsolete. Reordered carbon seal and the o-ring. I know there was an o-ring in the returned seal but this is unusual. That o-ring does not usually come with the seal. I remember putting the o-ring on; but when I was installing the seal; it didn't feel springy enough so I pulled it back off. There is a wave washer and a flat washer and an o-ring in the installation. I had inadvertently installed the wave washer first; and then the flat; but the flat should have been first. This explained the lack of springiness. I switched them around and reinstalled the assembly. I also know I changed the carbon seal faceplate and the o-ring for that too. Then we installed the idg. I wrote a card for the oil consumption run; but the lead brought data that said only a leak check was required. The data was a graph and only the leak check was required. We took it out for a leak check and ran at idle for ten minutes and no leaks were noted. I would like to know exactly which o-ring was missing.

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Original NASA ASRS Text

Title: A CRJ-200 returned back to field due to a #1 engine low oil quantity. An IDG and carbon seal replacement had been completed; but the carrier's Supplemental Procedure to perform an Oil Consumption Run had not been accomplished.

Narrative: I was assigned to a CRJ -200 aircraft on a December 2009 night with Mechanic 'X' and Mechanic 'Y'. Mechanic 'Y' worked on the Service Check. Mechanic 'X' chose the left engine and I worked the right engine. I did Igniter Inspection and starter oils. I went to the left engine and helped Mechanic pull the IDG off the engine. Removed IDG carbon seal; found broken. Found carbon seal on gearbox deteriorated. Asked the Lead to please order parts for gearbox. Helped Mechanic 'X' with the IDG carbon seal. Found parts that Lead got were the wrong Modification. The parts were for a two piece pre-modification seal; which is obsolete. Reordered carbon seal and the O-ring. I know there was an O-ring in the returned seal but this is unusual. That O-ring does not usually come with the seal. I remember putting the O-ring on; but when I was installing the seal; it didn't feel springy enough so I pulled it back off. There is a Wave washer and a flat washer and an O-ring in the installation. I had inadvertently installed the Wave washer first; and then the flat; but the flat should have been first. This explained the lack of springiness. I switched them around and reinstalled the assembly. I also know I changed the carbon seal faceplate and the O-ring for that too. Then we installed the IDG. I wrote a card for the Oil Consumption Run; but the Lead brought data that said only a Leak Check was required. The data was a graph and only the Leak Check was required. We took it out for a Leak Check and ran at idle for ten minutes and no leaks were noted. I would like to know exactly which O-ring was missing.

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.