FEASffiiLITY OF FATIGUE CRACK DETECTION IN FLUID-FILLED CYLINDRICAL HOLES USING CIRCUMFERENTIAL CREEPING WA VES

Recently, the deve1opment of a nove1 ultrasonic inspection technique that detects radial fatigue cracks on the far side of so-called "weep " holes in thin airframe stiffeners was reported [1]. Thesecrackstend tobe located on the upper part ofthe weep hole (at 12 o'clock position) therefore arenot readily detectable by conventional ultrasonic inspectio