Stress Corrosion Crack Detection on HU-25 Guardian Aircraft

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Description

Several ultrasonic inspection methods were developed at the Federal Aviation Administration's Airworthiness Assurance NDI Validation Center (AANC) to easily and rapidly detect hidden stress corrosion cracks in all vertical windshield posts on the US Coast Guard (USCG) HU-25 Guardian aircraft. The inspection procedure locates cracks as small as 2.0 millimeters emanating from internal fastener holes and determines their length. A test procedure was developed and a baseline assessment of the USCG fleet was conducted. Inspection results on twenty-five aircraft revealed a good correlation with results made during subsequent structural disassembly and visual inspection.

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6 p.

Creation Information

Blackmon, R.; Huffman, J.; Mello, C.W.; Moore, D.G. & Walkington, P.D. February 17, 1999.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 43 times , with 5 in the last month . More information about this article can be viewed below.


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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Several ultrasonic inspection methods were developed at the Federal Aviation Administration's Airworthiness Assurance NDI Validation Center (AANC) to easily and rapidly detect hidden stress corrosion cracks in all vertical windshield posts on the US Coast Guard (USCG) HU-25 Guardian aircraft. The inspection procedure locates cracks as small as 2.0 millimeters emanating from internal fastener holes and determines their length. A test procedure was developed and a baseline assessment of the USCG fleet was conducted. Inspection results on twenty-five aircraft revealed a good correlation with results made during subsequent structural disassembly and visual inspection.

Physical Description

6 p.

Notes

OSTI as DE00003695

Medium: P; Size: 6 pages

Source

  • 1999 ASNT (American Society for Nondestructive Testing) Spring Conference and Eighth Annual Research Symposium, Orlando, FL (US), 03/22/1999--03/26/1999

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  • Report No.: SAND99-0405C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 3695
  • Archival Resource Key: ark:/67531/metadc688052

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  • February 17, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 11, 2017, 2:45 p.m.

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Blackmon, R.; Huffman, J.; Mello, C.W.; Moore, D.G. & Walkington, P.D. Stress Corrosion Crack Detection on HU-25 Guardian Aircraft, article, February 17, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc688052/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.