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 tail rotor gearbox forward and
aft strut shall be removed in accordance with the applicable technical manuals listed in Table 1-1.
Access. Access is through the tail rotor transmission fairings (Figure 1-4, Items L540 and L546). If the strut is
removed, the bearing surfaces shall be marked.
Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
Use only appropriate platforms, workstands, or other approved locally procured stands
and restraint equipment when working above 10 feet on helicopter in a nontactical
environment. Otherwise, personnel injury could result from accidental falls.
NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.
Inspection Procedure. A magnetic field shall be applied to the part perpendicular to the orientation of
possible cracks. The position required for this inspection is illustrated in Figure 3-25.
Figure 3-25. Tail Rotor Gearbox Forward and Aft Strut