TM 1-1520-265-23Change 2 5-175.9 CROTCH ASSEMBLY AND SEGMENT RING (PT).5.9.1 Description(Figure5-1,IndexNo.9). The crotch assembly is mounted around the forwardsupport tube and is attached to the engine swirl frame with a sealed firewall plate.5.9.2 Defects. This Inspection is to be used to confirm suspect crack indications detected visuallythrough the casting. No cracks are allowed.5.9.3 PrimaryMethod. Flourescent Penetrant.5.9.3.1 NDI Equipment and Materials. (Refer to Appendix B.)a. Flourescent Penetrant Inspection Kitb. Black Light UV Kit5.9.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance andthe crotch assembly removed in accordance with the applicable technical manuals listed in Table 1-1.5.9.3.3 Access. Not applicable.5.9.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part orArea for NDI, paragraph 1.4.4.5.9.3.5Deleted.5.9.3.6Inspection Procedure. Perform the Flourescent Penetrant Inspection. Refer to theFlourescent Penetrant Method, paragraph 1.4.7 and Table 1--5. Inspect area of concern.5.9.3.7 Marking and Recording of Inspection Results. Mark and record inspection results asrequired by paragraph 1.3.5.9.3.8Backup Method. None required.5.9.3.9System Securing. Clean the part area to remove the inspection media. Refer to the postcleaning and restoration of part or area after NDI paragraph 1.4.16. Protective coatings shall beapplied as required. Parts or components if removed or disassembled, required installation orreassembly in accordance with the applicable technical manuals listed in Table 1--1..5.9.4 Deleted.5.9.5 Deleted.
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