A320
Maintenance Inspection Authority; Maintenance Powerplant; Maintenance Airframe
Maintenance Inspector 2; Maintenance Technician 33
Communication Breakdown; Distraction; Situational Awareness; Workload
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Human Factors; Procedure; Chart Or Publication
As a Quality Control (QC) Inspector at Contract Maintenance Repair Station X; I inspected the installation of an [IAE] V2500 series engine on Customer X's Airbus A320-200 aircraft. I failed to verify the proper installation of a Retainer Assembly for the Forward Engine Mount. Reference Customer X's A320 Task Card 71-00-20; Item-19; Step-3.  The step by step sequence of Item-19 is broken because the Engine Hoist Assembly has to be removed to get the final torque of the mount bolts. With proper tooling; the sequence of this task would not have been broken; and this critical step would not have been missed. As an Inspector with RII authority; I should have been aware to the reason for this deviation in the Task Card. After investigation; it was found that this is a standard deviation for Repair Station X. [This] Repair Station is in the process of correcting this process. I don't recall this event that happened in January; 2013. At times there is only one Inspector on the floor with three aircraft in maintenance. This may have also been a factor. In the future I will be more diligent in my duties as an Aircraft Maintenance Inspector.
Reporter stated he was informed a channel type retainer clip was found missing at the Forward mount on a  Customer's V2500 engine. The channel clip is used to secure the engine mount bolts that are installed with bolt heads upside down; to prevent the mount bolts from falling into the engine's diffuser case if the mount bolts sheared or if anyone of the nuts securing the bolts came off.  The missing retainer clip was noticed during an A-Check by one of the Customer's Line Maintenance Technician's several months after he had signed-off the A320 aircraft's inspection for the 2nd part of the Engine Change paperwork.
An Aircraft Inspector at a Contract Maintenance Repair Station reports that a sequence of Task Card steps had been broken due to a lack of proper tooling during installation of a V2500 Engine on a Customer's A320 aircraft. He missed a required step to verify the proper installation of a retainer assembly at the Forward Engine Mount.