Attachment 2 - CFM56_2A_SPM_TO 2.pdf

This is a Standard Practices Manual containing ultrasonic inspection procedures and technical specifications for federal aerospace inspections.

The document establishes requirements for ultrasonic instrument calibration, linearity parameters, and transducer specifications used in nondestructive testing. Key technical requirements include: Type A transducers must be Harisonic I31006-T, UTX IX-139, or TLC IS1010GA models with 3.00 inch (76.2 mm) dimensions or CFMI-approved equivalents; Type B transducers with 0.125 inch (#2) focal beam height; and calibration using SGP-177 or SGP044 side drill hole calibration blocks with specified depth ranges (0.060 to 1.500 inches). The document details linearity parameters for attenuator tracking with expected amplitude percentages of full screen height (FSH) ranging from 95% at 0 dB change to 6±2% at -24 dB change. Data recording systems must demonstrate capability to record responses from 0.125 inch deep #2 flatbottomed holes at designated inspection speeds, with responses set to 40 percent FSH when peaked statically in longitudinal mode and recorded at no less than 38 percent FSH. Annual verification of recorder capability is required. Resolution and signal-to-noise ratio specifications are provided for each transducer type. A complete ultrasonic inspection tooling kit (P/N GE-FQAP-381 or GE-FQAP-727) is available through manufacturer contact. The inspection standards apply across multiple CFM engine programs identified in the header as CFM56 variants and LEAP models.