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| Procedure 1: | Ultrasonic method (US) for testing of concealed skin sheet from outside |
| Procedure 2: | High Frequency Eddy Current method (HFEC) for testing of external doubler from outside and, as alternative to Procedure 1, testing of concealed skin from outside |
| Procedure 3: | Magneto-Optic Imager (MOI) for testing from outside in external doubler (alternative to Procedure 2) |
| Procedure 4: | Pulsed Eddy Current (PEC) for testing of concealed skin from outside (alternative to Procedures 1 and 2 partly) |