Experimental flight test vibration measurements and nondestructive inspection on a USCG HC-130H aircraft

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Description

This paper presents results of experimental flight test vibration measurements and structural inspections performed by the Federal Aviation Administration`s Airworthiness Assurance NDI Validation Center (AANC) at Sandia National Laboratories and the US Coast Guard Aircraft Repair and Supply Center (ARSC). Structural and aerodynamic changes induced by mounting a Forward Looking Infrared (FLIR) system on a USCG HC-130H aircraft are described. The FLIR adversely affected the air flow characteristics and structural vibration on the external skin of the aircraft`s right main wheel well fairing. Upon initial discovery of skin cracking and visual observation of skin vibration in flight by the FLIR, ... continued below

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10 p.

Creation Information

Moore, D.G.; Jones, C.R.; Mihelic, J.E. & Barnes, J.D. August 1, 1998.

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This report 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 76 times , with 4 in the last month . More information about this report can be viewed below.

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Authors

  • Moore, D.G.
  • Jones, C.R. Sandia National Labs., Albuquerque, NM (United States). FAA Airworthiness Assurance NDI Validation Center
  • Mihelic, J.E.
  • Barnes, J.D. Coast Guard Aircraft Repair and Supply Center, Elizabeth City, NC (United States)

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Description

This paper presents results of experimental flight test vibration measurements and structural inspections performed by the Federal Aviation Administration`s Airworthiness Assurance NDI Validation Center (AANC) at Sandia National Laboratories and the US Coast Guard Aircraft Repair and Supply Center (ARSC). Structural and aerodynamic changes induced by mounting a Forward Looking Infrared (FLIR) system on a USCG HC-130H aircraft are described. The FLIR adversely affected the air flow characteristics and structural vibration on the external skin of the aircraft`s right main wheel well fairing. Upon initial discovery of skin cracking and visual observation of skin vibration in flight by the FLIR, a baseline flight without the FLIR was conducted and compared to other measurements with the FLIR installed. Nondestructive inspection procedures were developed to detect cracks in the skin and supporting structural elements and document the initial structural condition of the aircraft. Inspection results and flight test vibration data revealed that the FLIR created higher than expected flight loading and was the possible source of the skin cracking. The Coast Guard performed significant structural repair and enhancement on this aircraft, and additional in-flight vibration measurements were collected on the strengthened area both with and without the FLIR installed. After three months of further operational FLIR usage, the new aircraft skin with the enhanced structural modification was reinspected and found to be free of flaws. Additional US Coast Guard HC-130H aircraft are now being similarly modified to accommodate this FLIR system. Measurements of in-flight vibration levels with and without the FLIR installed, and both before and after the structural enhancement and repair were conducted on the skin and supporting structure in the aircraft`s right main wheel fairing. Inspection results and techniques developed to verify the aircraft`s structural integrity are discussed.

Physical Description

10 p.

Notes

OSTI as DE98006173

Source

  • 2. joint NASA/FAA/DOD conference on aging aircraft, Williamsburg, VA (United States), 31 Aug - 3 Sep 1998

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  • Other: DE98006173
  • Report No.: SAND--98-0248C
  • Report No.: CONF-980830--
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/656772 | External Link
  • Office of Scientific & Technical Information Report Number: 656772
  • Archival Resource Key: ark:/67531/metadc706733

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • August 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

Description Last Updated

  • June 23, 2016, 3:49 p.m.

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Moore, D.G.; Jones, C.R.; Mihelic, J.E. & Barnes, J.D. Experimental flight test vibration measurements and nondestructive inspection on a USCG HC-130H aircraft, report, August 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc706733/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.