TM 1-1520-265-232.17.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph 1.3.2.17.4 BackupMethod. Fluorescent Penetrant, refer to paragraph 1.4.7.2.17.5 SystemSecuring. The bifilar vibration absorber, if removed, requires installation in accordance with theapplicable technical manuals listed in Table 1-1.2.18 BIFILAR WEIGHT (UT).2.18.1 Description(Figure2-1.IndexNo.18). The bifilar weight is part of an assembly that pivots on two points at theend of each bifilar absorber support arm.2.18.2 Defects. This inspection is to detect manufacturing defects in the bond line between the two legs and the body ofthe weight.2.18.3 Primary Method. Ultrasonic 2.18.3.1 NDI Equipment and Materials. (Refer to Appendix B.)a.Ultrasonic Inspection Unitb.Transducer, 5.0 MHz,45s shear wave, 1/4 x 1/4 inch elementc.Cable Assembly, BNC to Microdotd.Consumable Materials, refer to Table 1-8e.Aircraft Marking Pencil, refer to Table 1-82.18.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance.Partial inspection for cause (visual indications, sites of mechanical damage, corrosion, etc.) may be performed on allexposed surfaces of the installed part using applicable positions of this procedure. If required, the bifilar weight shall beremoved from the helicopter in accordance with applicable technical manuals listed in Table 1-1.2.18.3.3 Access. Access to the bifilar weights is from the UR engine cowl (Figure 1-4, Items 3T-7 and 4T-8).2.18.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,paragraph 1.4.4.2.18.3.5 NDI Equipment Settings.a.Make the following initial settings on the Ultrasonic Inspection Unit, USD-15S:(SETUP - DEFAULT SETTINGS)DIALOG ENGLISH2-38
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
