TM 1-1520-253-23
DRIVESHAFT ADAPTER PLATE (PT).
3.8.1 Description (Figure 3-1), Index No. 8). The driveshaft adapter plates are flexible steel
plates bolted to adapter assemblies which provide for attachment of the driveshafts.
3.8.2 Defects. Defects may occur anywhere on the surface of the plates. No cracks are allowed.
3.8.3 Primary Method. Fluorescent penetrant.
3.8.3.1 NDI Equipment and Materials. (Refer to Appendix B.) AMS-2644, level 3 penetrant mate-
rials shall be selected from the approved list in Table 1-8. Parts requiring fluorescent penetrant
inspection shall be cleaned prior to inspection with n-Propyl Bromide (vapor degreasing only)
(Table 1-8) or Isopropyl Alcohol (Table 1-8) rinse or wipe; or drying until there is no visible solvent
residue left on parts.
3.8.3.2 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 all exposed surfaces of the installed part using this procedure. If required, the
driveshaft adapter plates shall be removed and disassembled in accordance with the applicable
technical manuals listed in Table 1-1.
3.8.3.3 Access. Access is through the cabin crown tunnel covers. See Figure 1-4 - CH-47: 8;
MH-47: 3.
3.8.3.4 Penetration of Part. Protective coating shall be removed and the part shall be thoroughly
cleaned. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.
3.8.3.5 Inspection Procedure. Perform fluorescent penetrant inspection. Refer to Fluorescent
Penetrant Method, paragraph 1.4.7 and Table 1-5. Inspect the part. See Figure 3-8.
3.8.3.6 Marking and Recording of Inspection Results. Mark and record as required by paragraph
3.8.4 Backup Method. None required.
3.8.5 System Securing. Clean the part or area to remove inspection media. Refer to Post Clean-
ing and Restoration of Part or Area After NDI paragraph 1.4.16. Protective coating shall be reap-
plied as required. Reinstall or assemble parts or components in accordance with the applicable
technical manuals listed in Table 1-1.
NDI_CH/MH-47F3_8
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