AFT ENGINE MOUNT STRUTS (IT).

Figure 5-4. Air Inlet Assembly and Bleed-Air Exhaust Slots

TM-1-1520-265-23 H-60 Helicopter Series Manual
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TM 1-1520-265-23 a. Place probe on a good area in the inspection location and null. Adjust phase as required to obtain horizontal lift- off. b. Inspect the part. c. Any signal similar to the notches in the test block are cause for rejection. NOTE Either probe identified in paragraph 5.4.3.1 may be used depending primarily on the ease of accessibility and user friendliness. If the probes are changed, steps 5.4.3.5 b. (1), (2), and (3) shall be repeated each time a change is made. 5.4.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph 1.3. 5.4.4 Backup Method. None required. 5.4.5 System Securing. Not applicable. 5.5 AFT ENGINE MOUNT STRUTS (IT). 5.5.1 Description (Figure 5-1. Index No. 5). The aft engine mount struts attach to fittings on the air frame and links attach to the engine. 5.5.2 Defects. Cracks may occur anywhere on the surface of the aft engine mount struts. No cracks are allowed. 5.5.3 Primary Method. Magnetic Particle. 5.5.3.1 NDI Equipment and Materials. (Refer to Appendix B.) a. Magnetic Particle Inspection Probe/Yoke b. Magnetometer c. Black Light d. Fluorescent Magnetic Particles, refer to Table 1-8 e. Consumable Materials, refer to Table 1-8 f. Aircraft Marking Pencil, refer to Table 1-8 NOTE Hand-held magnetic coil may be used. Refer to paragraph 1.4.8.1.2 and Figure 1-6. 5.5.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance. A partial inspection for cause (visual indications, sites of mechanical damage, corrosion, etc.) may be performed on all exposed surfaces of the installed part using applicable positions of this procedure. If required, the struts shall be removed in accordance with the applicable technical manuals listed in Table 1-1. 5-8

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