Stress Corrosion Crack Detection on HU-25 Guardian Aircraft

Conference · Wed Feb 17 00:00:00 EST 1999

OSTI ID:3695

Blackmon, R; Huffman, J; Mello, C W; Moore, D G; Walkington, P D

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.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 3695
• Report Number(s): SAND99-0405C; TRN: AH200113%%4
• Resource Relation: Conference: 1999 ASNT (American Society for Nondestructive Testing) Spring Conference and Eighth Annual Research Symposium, Orlando, FL (US), 03/22/1999--03/26/1999; Other Information: PBD: 17 Feb 1999
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
AIRCRAFT
DETECTION
FASTENERS
STRESS CORROSION
ULTRASONIC TESTING
US COAST GUARD
VALIDATION
CRACK PROPAGATION
INSPECTION