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AGMA 05FTM15:2005 Edition

AGMA 05FTM15:2005 Edition

$14.30

Repair of Helicopter Gears

Published By Publication Date Number of Pages
AGMA 2005 11
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Authors: Suren Rao and Doug McPherson, The Pennsylvania State University and Gary

Sroka, REM Chemicals, Inc.

In order to reduce costs by extending the operational life of the sun and input pinion gears of a helicopter

transmission, scraped gears were subject to a superfinishing process. This process was found to remove

minor foreign object damage by uniformly removing a minimal amount of material on the gear teeth, while

meeting original manufacturing specifications for geometry. The process also resulted in enhanced surface

quality and did not exhibit detrimental metallurgical effects on the surface or sub–surface of the teeth. The

process was also found to eliminate gray staining, an early precursor to pitting. This paper describes the

results of the helicopter gear repair project and includes the geometry and metallurgical evaluations on the

repaired gear. Further effort to characterize the durability and strength characteristics of the repaired gear is

ongoing.

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