TM 1-1520-265-23
5-18
Change 2
Figure 5-9. Crotch Assembly and Segment Ring
5.10 FORWARD SUPPORT TUBE (PT).
5.10.1 Description (Figure 5-1, Index No. 10). The forward support tube attaches to the engine swirl
frame. The output shaft is installed through restrainer rings fastened inside the tube.
5.10.2 Defects. This inspection is used to confirm suspect crack indications detected visually
through the casting. No cracks are allowed.
5.10.3 Primary Method. Flourescent Penetrant.
5.10.3.1 NDI Equipment and Materials. (Refer to Appendix B.)
a. Flourescent Penetrant Inspection Kit
b. Black Light UV Kit
5.10.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance
and the engine removed in accordance with the applicable technical manuals listed in Table 1-1.
5.10.3.3 Access. Not applicable.
5.10.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or
Area for NDI, paragraph 1.4.4.
5.10.3.5 Deleted.
