Accession Number:

ADA128741

Title:

Demonstration and Analysis of an Improved Nondestructive Evaluation (NDE) Method for Rotary Wing Head Spindle Threads

Descriptive Note:

Final rept.

Corporate Author:

SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s):

Report Date:

1982-06-01

Pagination or Media Count:

30.0

Abstract:

Present inspection methods for the Black Hawk helicopter rotary wing head spindle require almost complete disassembly of the rotary wing head and hub assemblies to expose the failure critical threads for inspection. Even with direct access to the threads, detection of fatigue cracks in the thread roots is very difficult using penetrant and visual methods. Therefore, the primary purpose of this project was to demonstrate an improved nondestructive evaluation NDE method for the spindle using the electric current perturbation ECP method which requires only minimal disassembly for safety-of-flight inspections. High sensitivity inspection of the spindle threads applicable to routine teardown maintenance was also demonstrated.

Subject Categories:

  • Helicopters
  • Test Facilities, Equipment and Methods
  • Electricity and Magnetism
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE