CBM component testing at the university of south carolina

AH-64 tail rotor gearbox studies

Nicholas Goodman, Abdel Bayoumi, Vytautas Blechertas, Ronak Shah, Yong June Shin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Citations (Scopus)

Abstract

The AH-64 helicopter tail rotor gearbox is a grease lubricated right-angle transmission which frequently leaks through both its input and output seals. An experiment was designed to create a worst-case scenario for a leaking output seal on three different high-life gearboxes, which were to be run for 500 hours in a seeded fault condition. The test objective was to demonstrate that aircraft with leaking output seals could continue to operate until a scheduled phase maintenance which occurs every 250 hours. Although previously considered impossible, during the study it became evident that grease freely moves from the main gear compartment into the static mast As a result, the output seal leaks caused lubricant starvation on the gear mesh surfaces, ultimately leading to catastrophic failures of the input gear teeth. The three gearboxes tested survived 490, 487, and 573 hours after fault seeding, and numerous vibration and thermal observations were recorded as the gearboxes approached failure.

Original languageEnglish
Title of host publicationAmerican Helicopter Society International - AHS International Condition Based Maintenance Specialists Meeting 2009
Pages129-136
Number of pages8
Publication statusPublished - 2009 Nov 5
EventAHS International Condition-Based Maintenance Specialists Meeting 2009 - Huntsville, AL, United States
Duration: 2009 Feb 102009 Feb 11

Other

OtherAHS International Condition-Based Maintenance Specialists Meeting 2009
CountryUnited States
CityHuntsville, AL
Period09/2/1009/2/11

Fingerprint

Seals
Rotors
Lubricating greases
Testing
Gears
Gear teeth
Helicopters
Lubricants
Aircraft
Experiments

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Safety, Risk, Reliability and Quality

Cite this

Goodman, N., Bayoumi, A., Blechertas, V., Shah, R., & Shin, Y. J. (2009). CBM component testing at the university of south carolina: AH-64 tail rotor gearbox studies. In American Helicopter Society International - AHS International Condition Based Maintenance Specialists Meeting 2009 (pp. 129-136)
Goodman, Nicholas ; Bayoumi, Abdel ; Blechertas, Vytautas ; Shah, Ronak ; Shin, Yong June. / CBM component testing at the university of south carolina : AH-64 tail rotor gearbox studies. American Helicopter Society International - AHS International Condition Based Maintenance Specialists Meeting 2009. 2009. pp. 129-136
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abstract = "The AH-64 helicopter tail rotor gearbox is a grease lubricated right-angle transmission which frequently leaks through both its input and output seals. An experiment was designed to create a worst-case scenario for a leaking output seal on three different high-life gearboxes, which were to be run for 500 hours in a seeded fault condition. The test objective was to demonstrate that aircraft with leaking output seals could continue to operate until a scheduled phase maintenance which occurs every 250 hours. Although previously considered impossible, during the study it became evident that grease freely moves from the main gear compartment into the static mast As a result, the output seal leaks caused lubricant starvation on the gear mesh surfaces, ultimately leading to catastrophic failures of the input gear teeth. The three gearboxes tested survived 490, 487, and 573 hours after fault seeding, and numerous vibration and thermal observations were recorded as the gearboxes approached failure.",
author = "Nicholas Goodman and Abdel Bayoumi and Vytautas Blechertas and Ronak Shah and Shin, {Yong June}",
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Goodman, N, Bayoumi, A, Blechertas, V, Shah, R & Shin, YJ 2009, CBM component testing at the university of south carolina: AH-64 tail rotor gearbox studies. in American Helicopter Society International - AHS International Condition Based Maintenance Specialists Meeting 2009. pp. 129-136, AHS International Condition-Based Maintenance Specialists Meeting 2009, Huntsville, AL, United States, 09/2/10.

CBM component testing at the university of south carolina : AH-64 tail rotor gearbox studies. / Goodman, Nicholas; Bayoumi, Abdel; Blechertas, Vytautas; Shah, Ronak; Shin, Yong June.

American Helicopter Society International - AHS International Condition Based Maintenance Specialists Meeting 2009. 2009. p. 129-136.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Goodman N, Bayoumi A, Blechertas V, Shah R, Shin YJ. CBM component testing at the university of south carolina: AH-64 tail rotor gearbox studies. In American Helicopter Society International - AHS International Condition Based Maintenance Specialists Meeting 2009. 2009. p. 129-136