No Aircraft
Training / Qualification
Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Procedure; Manuals; Equipment / Tooling; Human Factors
I was trunnioning the LPC [Low Pressure Compressor]. The balance arbor became detached from the LPC during the trunnion process and fell to the floor damaging 12 each 2.3 blades. The tooling work bolts used to attach the arbor to the LPC were provided by EGAT and were too short. Suggestion to add a caution to the JIC [Job Instruction Card] stating the minimum size bolts to use when attaching the arbor to the LPC.
Attachment of handling slings to balance arbor of LPC [Low Pressure Compressor]; bolts too short on end with sleeve on arbor. Going to vertical position - sleeve section slipped off/detached from rest or Arbor. LPC Disc was from a training engine from Pratt and Whitney. Working off Job Card training with Pratt representative/trainer. Sling tooling bolts too short. Trunnion LPC attached to arbor from horizontal work stand to upside down position (vertical) sleeve detached; LPC fell to ground on one end. Note in Job Card for minimum length of bolts to be used with tooling. Better holding compartment of sling tool bolts to be kept with sling tool - proper bolts kept together.
Technicians reported incorrect bolts used on device to lift engine compressor disc resulted in damage to blades.