METHOD OF REPLACEMENT OF FRONT CASE OF GAS-TURBINE ENGINE FAN MODULE Russian patent published in 2005 - IPC

FIELD: running ground repair of bypass gas-turbine engines; replacement of front case of fan module.

SUBSTANCE: proposed method includes dismantling of engine and replacement of defective front case of fan. Technological ring is mounted and technological plunger is placed along axis of engine; said plunger is provided with bracket and dial indicator. By rotating the plunger, end play of surface of technological ring relative to axis of rotation of plunger is measured by means of dial indicator. Then, partial dismantling of engine is performed, viz.: separation of afterburner with adjustable nozzle, mixer housing with rear case of second loop, body of turbine supports together with cone, low-pressure turbine rotor and fan fairing with inductor. Technological ring is mounted on rear flange of low-pressure turbine nozzle assembly. Technological plunger is mounted in front and rear trunnions of fan rotor and bracket with dial indicator is secured on technological plunger near technological ring. Besides that, radial run-out of inner circular surface of technological ring relative to axis of rotation of plunger is measured. Defective front case of fan is replaced with standard one and again end play and radial run-out of technological ring surfaces are measured. If measurements are within tolerable limits, front case may be engaged with engine.

EFFECT: facilitated procedure of replacement of front case of fan.

2 cl, 3 dwg