Narrative:

We had an engine change on a dhc-8-100 aircraft for #2 engine leaking excessive oil. I was the senior mechanic on shift with three other mechanics with very little to no experience on an engine change. The weather at the time was very severe rain; so in turn only one mechanic was sent up from ZZZ1 with all the equipment to change the engine. We were provided a hangar by another air carrier. So with the manpower we were given; we began the engine change with the paperwork. I handled the engine change; as well as the gate calls in the station.we finished the engine change the next day. From what I was told; everything went well with the engine change. The aircraft was ferried to ZZZ1 and did some flights from there from what I was told by supervisor. A flight crew found oil coming from [propeller] hub assembly.the reason the event occurred was due to the lack of manpower and experience. When the engine was dropped; we needed a quality control (qc) inspector; which was not able to get there on time due to weather conditions. So; maintenance control gave permission for mr. X from ZZZ1 to have a temporary rii [inspection authority] for certain parts of the engine installation. As we continued to install the engine we needed more qc blocks signed-off by an inspector. Mr. X from ZZZ1 insisted to continue and that he would rii the rest of the engine change. As far as I could think of; all the work that I performed on the hub assembly and the propeller was looked at by the mr. X from ZZZ1 and was performed in accordance with the work card provided.from what I was told; the aircraft got ferried back to ZZZ1 and the work was looked at again. I have no comment or suggestions for avoiding this recurrence.

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Original NASA ASRS Text

Title: A Line Mechanic and Maintenance Controller report about another Mechanic who exceeded the temporary RII inspection authority issued to him by the Maintenance Controller to help expedite an engine change installation on a company DHC-8-100 aircraft. The #2 engine was replaced due to excessive oil leakage.

Narrative: We had an engine change on a DHC-8-100 aircraft for #2 engine leaking excessive oil. I was the Senior Mechanic on shift with three other mechanics with very little to no experience on an engine change. The weather at the time was very severe rain; so in turn only one Mechanic was sent up from ZZZ1 with all the equipment to change the engine. We were provided a hangar by another Air Carrier. So with the manpower we were given; we began the engine change with the paperwork. I handled the engine change; as well as the gate calls in the station.We finished the engine change the next day. From what I was told; everything went well with the engine change. The aircraft was ferried to ZZZ1 and did some flights from there from what I was told by Supervisor. A flight crew found oil coming from [propeller] hub assembly.The reason the event occurred was due to the lack of manpower and experience. When the engine was dropped; we needed a Quality Control (QC) Inspector; which was not able to get there on time due to weather conditions. So; Maintenance Control gave permission for Mr. X from ZZZ1 to have a temporary RII [inspection authority] for certain parts of the engine installation. As we continued to install the engine we needed more QC blocks signed-off by an Inspector. Mr. X from ZZZ1 insisted to continue and that he would RII the rest of the engine change. As far as I could think of; all the work that I performed on the hub assembly and the propeller was looked at by the Mr. X from ZZZ1 and was performed in accordance with the work card provided.From what I was told; the aircraft got ferried back to ZZZ1 and the work was looked at again. I have no comment or suggestions for avoiding this recurrence.

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.