METHOD OF INSPECTING BACKLASH OF INNER RINGS OF DUCTED-FAN ENGINE FORWARD CHANNEL Russian patent published in 2004 - IPC

Abstract RU 2241970 C2

FIELD: diagnostics and inspection of ducted-fan aircraft engines.

SUBSTANCE: method includes removal of compressor cowling, removal of plugs from hatches for inspecting blades, installation of test-point provided with transient sleeve into hatches and measuring backlash by means of indicator or displacement transducer. Backlash of internal rings used for fixing internal necks of blades of ducted-fan is restricted in the direction of axis of rotation of compressor's rotor for the value being less or equal to 0,133 of axial gap between disc edge of compressor rotor, disposed up the flow, and edge of internal ring and for value being equal or less than maximal radial gap along peripheral part of rotor disc blades. In case the backlash of internal ring increases one of mentioned values engine should be withdrawn from exploitation.

EFFECT: safety exploitation; prolonged exploitation period of engines.

4 dwg

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RU 2 241 970 C2

Authors

Krjuchkov Ju.A.

Kolesnikova L.S.

Rokka N.I.

Chirkov V.A.

Dates

2004-12-10—Published

2002-12-05—Filed