Perils and pitfalls of PIND testing

The detection of loose particles in electronic parts by means of Particle Impact Noise Detection (PIND) testing is seen as becoming increasingly common in advanced aerospace systems. Problems in performing this test are discussed, as are techniques for avoiding loose particles in the original part packages and avoiding erroneous indication of particles. It is concluded that PIND testing can be conducted successfully if extreme care is used in both the fabrication of the parts to be tested and in the performance of the PIND testing itself. It is noted that anything less will result in failure of all lots submitted to PIND tests. Attention is given to the principal peril in PIND testing, namely that in general many more parts will be reflected than would be thought possible with well made parts.