Narrative:

I performed a full day's maintenance at the maintenance facility on aircraft X. I was informed at the end of my shift that my base would be swapping aircraft from aircraft X to aircraft Y. After a restless night's sleep; I reported to the base [at] xa:30 to begin prepping the aircraft and records for the swap. After everything was ready; I proceeded to the maintenance facility to make sure everything with aircraft X was in order. After assisting the crews with swapping aircraft and taking care of any questions that arose I checked the due list on aircraft Y and saw that an oil sample was approaching the window. I asked the pilot to fly the remaining time enroute to the base; which he did. At approximately xm:30; I took an engine oil sample and made the appropriate log book entry.however; an engine oil sample was not what was due. The correct sample was a mgb [main gear box] oil sample.[5 days later]; I was reviewing the previous few days' work and found that I had taken the sample from the wrong component. I immediately reviewed to make sure there was not an overflight of the task; took the correct mgb sample with the appropriate log book entry.my remedy would be to make sure that if I am tired; I stop [performing] maintenance. This is especially true if I am dealing with a task that has a window. I should have and ultimately could have waited until a few days later and still had time remaining to complete this task. Also; when swapping to another aircraft and I am not familiar with the tracking tasks; double check the due list to make sure I understand the upcoming items.

Google
 

Original NASA ASRS Text

Title: Helicopter Maintenance Technician reported submitting an oil sample from the wrong component.

Narrative: I performed a full day's maintenance at the maintenance facility on Aircraft X. I was informed at the end of my shift that my base would be swapping aircraft from Aircraft X to Aircraft Y. After a restless night's sleep; I reported to the base [at] XA:30 to begin prepping the aircraft and records for the swap. After everything was ready; I proceeded to the maintenance facility to make sure everything with Aircraft X was in order. After assisting the crews with swapping aircraft and taking care of any questions that arose I checked the due list on Aircraft Y and saw that an oil sample was approaching the window. I asked the pilot to fly the remaining time enroute to the base; which he did. At approximately XM:30; I took an engine oil sample and made the appropriate log book entry.However; an engine oil sample was not what was due. The correct sample was a MGB [main gear box] oil sample.[5 days later]; I was reviewing the previous few days' work and found that I had taken the sample from the wrong component. I immediately reviewed to make sure there was not an overflight of the task; took the correct MGB sample with the appropriate log book entry.My remedy would be to make sure that if I am tired; I stop [performing] maintenance. This is especially true if I am dealing with a task that has a window. I should have and ultimately could have waited until a few days later and still had time remaining to complete this task. Also; when swapping to another aircraft and I am not familiar with the tracking tasks; double check the due list to make sure I understand the upcoming items.

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.