T.O. 33B-1-1 5-66 Table 5-5.  Ultrasonic Inspection Methods for Bonded Structures. Scan   Line Number (Fig. 5-82) Applicable Methods 1 Near-Side Skin-to-Core a. Pitch/Catch b. Mechanical Impedance Analysis c. Resonance d. Eddy-sonic e. Through-transmission f. Pulse-echo g. Ringing Core Damage a. Mechanical Impedance Analysis b. Through-transmission c. Pulse-echo Far-Side Skin-to-Core a. Mechanical Impedance Analysis b. Through-transmission 2 Near-Side Skin-to-Core a. Resonance c. Mechanical Impedance Analysis b. Through-transmission c. Ringing Core Damage a. Mechanical Impedance Analysis b. Through-transmission Far-Side Skin-to-Core a. Mechanical Impedance Analysis b. Through-transmission 3 a. Resonance b. Mechanical Impedance Analysis c. Ringing 4 a. Resonance b. Ringing c. Through-transmission d. Damping 5 a. Resonance b. Ringing 6 a. Through-transmission (with fluid delay lines) 7 a. Resonance b. Mechanical Impedance Analysis c. Through-transmission d. Ringing 5.4.4 Inspection Methods for Bonded Structures. Table 5-6 lists ultrasonic bond inspection methods along with advantages and limitations of each method.  Additional information on each method is provided in the following paragraphs.