Noise. H&MS 16 test cell, MMAF, 1969

Test cell operations. With several engines being tested at once in a small area all day long, I can understand why my hearing is shot. My wife says it is a selective hearing problem. I thought the aft area of CH-46 was loud but it was nothing compared to a OV-10 and a CH-53 engines being tested at once about 20 feet apart at 110 percent.