Narrative:

Upon arriving to work midnight shift; I was informed that an emb-140 aircraft; which I removed and replaced the #1 main generator on earlier that morning; the flight had diverted; [on] the first flight of that day due to engine# 1 oil loss of seven quarts. After further investigation [by] myself; I was told maintenance was sent onsite and was able to determine the cause of the oil loss was due to a defective garlock seal on the #1 generator.in the early morning of the day [the generator was replaced] as the job was nearing completion; the second to last step of job procedure calls for an operational test of the generator; feeling fatigued and the pressure to make morning flight; while performing an idle run of generators and noting no leaks; I overlooked the last step of job procedure which as stated to do an engine leak test (run at maximum take-off power for at least three minutes; but no more than five minutes). Failing to do this; I was unable to note leaks; which occurred in flight of the #1 engine oil loss.after it was determined garlock seal was the cause; they replaced the #1 generator garlock seal; performed a high power run and there was no leaks noted; which concluded that the garlock seal failed and caused the engine oil loss.to prevent the reoccurrence of this event I plan to completely and thoroughly read and comply with all job tasks as work is being accomplished to avoid omitting steps in job procedures. I also plan to safely accomplish work in time allotted; and if not then I will turn over tasks unaccomplished; and not allow pressure of making flight time deter with maintenance. I also suggest better lightning; and equipment (work stands); because work was performed outside; better flow of parts; and teamwork; and experience. And lastly; the job task flow requires referring to different tasks and returning to previous tasks in another section. It would be better to have a continuous flow of tasks within one section.

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Original NASA ASRS Text

Title: A Line Mechanic reports failing to complete a job procedure that required a maximum high power engine run to detect oil leaks at a Garlock seal after changing the generator on an EMB-140 # 1 engine. On the first flight out the #1 engine lost seven quarts of oil. Aircraft diverted. Mechanic noted that fatigue and concern for making early morning departure were contributing factors.

Narrative: Upon arriving to work midnight shift; I was informed that an EMB-140 aircraft; which I removed and replaced the #1 Main Generator on earlier that morning; the flight had diverted; [on] the first flight of that day due to engine# 1 oil loss of seven quarts. After further investigation [by] myself; I was told Maintenance was sent onsite and was able to determine the cause of the oil loss was due to a defective Garlock seal on the #1 generator.In the early morning of the day [the generator was replaced] as the job was nearing completion; the second to last step of job procedure calls for an operational test of the generator; feeling fatigued and the pressure to make morning flight; while performing an idle run of generators and noting no leaks; I overlooked the last step of job procedure which as stated to do an engine leak test (run at maximum take-off power for at least three minutes; but no more than five minutes). Failing to do this; I was unable to note leaks; which occurred in flight of the #1 engine oil loss.After it was determined Garlock seal was the cause; they replaced the #1 generator Garlock seal; performed a high power run and there was no leaks noted; which concluded that the Garlock seal failed and caused the engine oil loss.To prevent the reoccurrence of this event I plan to completely and thoroughly read and comply with all job tasks as work is being accomplished to avoid omitting steps in job procedures. I also plan to safely accomplish work in time allotted; and if not then I will turn over Tasks unaccomplished; and not allow pressure of making flight time deter with Maintenance. I also suggest better lightning; and equipment (work stands); because work was performed outside; better flow of parts; and teamwork; and experience. And lastly; the job task flow requires referring to different tasks and returning to previous tasks in another section. It would be better to have a continuous flow of tasks within one section.

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.