Narrative:

[A maintenance technician] and I began packing an engine for shipment and found the pin to the aft mount would not fit. We discovered bushings that needed to be removed in order for the pin to fit and; I instantly wondered if the new engine we just installed had the bushings installed in the aft mount. We originally removed the #1 engine to facilitate maintenance. The original plan was for a pratt and whitney team to swap a combustion liner in the field and this engine would be reinstalled. After removal I performed an inspection of the engine mounts and all mounts; fittings; and bushings checked out ok. The pratt and whitney team arrived and during their combustion liner swap discovered more damage and the engine would need to go to the manufacturer for repairs.the decision was made to replace the engine. The engine arrived; [the maintenance technician] and I began installation [and] engine installation went well we continued installation and completed installation on in accordance with EC135 MM. During check flights we discovered maintenance manuals on company web site was not current. We notified [the company] and was informed that current revision will be installed. We completed check flights and signed off the aircraft return to service. The aircraft logged around 2 hours since engine replacement. The aircraft arrived this afternoon and [another maintenance technician] and I checked the aft mount to discover bushings not installed. We took the aircraft out of service and made repairs. We inspected all handwork and did not find any discrepancies. We conducted all maintenance according to maintenance manual (MM) and I am still disappointed in myself for missing those bushings. I believe the error came from us installing what we believed to be a complete and serviceable engine. Minor build up was required and manuals where used during all maintenance. Because a late decision was made to install a new engine I did not think to inspect new engine mounts after all mounts had already been inspected. The bushings are tiny and hidden in the aft engine mount and easy to miss I did not think to check aft mount until we had to remove them for engine packing. We did work late hours during this whole event but nothing unreasonable at no time did I feel too tired or unsafe. [The maintenance technician] and I reviewed the rii and did not see mounts. One remedy to this problem I would like to recommend is to add a caution or note in the rii that includes special attention to the aft engine mounts for bushings.

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Original NASA ASRS Text

Title: Two maintenance technicians reported that after installing an engine in a Eurocopter it was discovered they failed to install the bushings in the aft mount.

Narrative: [A maintenance technician] and I began packing an engine for shipment and found the pin to the aft mount would not fit. We discovered bushings that needed to be removed in order for the pin to fit and; I instantly wondered if the new engine we just installed had the bushings installed in the aft mount. We originally removed the #1 engine to facilitate Maintenance. The original plan was for a Pratt and Whitney Team to swap a combustion liner in the field and this engine would be reinstalled. After removal I performed an inspection of the engine mounts and all mounts; fittings; and bushings checked out ok. The Pratt and Whitney team arrived and during their combustion liner swap discovered more damage and the engine would need to go to the manufacturer for repairs.The decision was made to replace the engine. The engine arrived; [the maintenance technician] and I began installation [and] engine installation went well we continued installation and completed installation on IAW EC135 MM. During check flights we discovered Maintenance Manuals on company Web site was not current. We notified [the company] and was informed that current revision will be installed. We completed Check flights and signed off the aircraft return to service. The aircraft logged around 2 hours since engine replacement. The aircraft arrived this afternoon and [another maintenance technician] and I checked the aft mount to discover bushings not installed. We took the aircraft out of service and made repairs. We inspected all handwork and did not find any discrepancies. We conducted all maintenance according to Maintenance Manual (MM) and I am still disappointed in myself for missing those bushings. I believe the error came from us installing what we believed to be a complete and serviceable engine. Minor build up was required and manuals where used during all maintenance. Because a late decision was made to install a new engine I did not think to inspect new engine mounts after all mounts had already been inspected. The bushings are tiny and hidden in the aft engine mount and easy to miss I did not think to check aft mount until we had to remove them for engine packing. We did work late hours during this whole event but nothing unreasonable at no time did I feel too tired or unsafe. [The maintenance technician] and I reviewed the RII and did not see mounts. One remedy to this problem I would like to recommend is to add a caution or note in the RII that includes special attention to the aft engine mounts for bushings.

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.