A320
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Troubleshooting; Confusion
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Aircraft Damaged; General Maintenance Action
Human Factors; Chart Or Publication
Midnight shift. Myself as Mechanic X and Mechanic Z were attempting to remove the Retaining Ring for the Number 1 Engine. We were unaware that the retaining ring had been installed incorrectly. Therefore; when we tightened the jackscrews to remove it we encountered resistance. Ultimately; the jackscrew at the twelve o'clock position sheared off. At that point we thought that the jackscrews were too short so; we tried longer jackscrews to no avail. We were not able to remove the retaining ring so we notified the Maintenance Supervisor. The problem was not resolved before the end of shift. When I came into work for my next shift; I was made aware that the Retaining Ring had been installed incorrectly. As a result of that incorrect installation; our attempt to remove it ended up causing slight damage to the flange; aircraft damage.
During the installation of the Front [Fan] Blade Retaining Ring there is a (...CW...) item [signature block item on Job Card] and it is not clearly understood as to whether this is a 'Clearance' item; or a 'Check' item before 'Continuing' [on with the work] item. [Mechanic Y].
Two mechanics report about their efforts to remove a Retaining Ring at the Forward Fan Blade assembly on a V2500 engine. The A320 aircraft's Number 1 Engine flange was slightly damaged.