TM 1-1520-265-23
Change 3
5-13
5.7 AFT ENGINE MOUNT LINKS (PT).
5.7.1 Description (Figure 5-1, Index No. 7). The aft engine mount links attach the mount struts
and the aft mount support to the engine. Each engine has six links.
5.7.2 Defects. Cracks may occur anywhere on the mount links. No cracks are allowed.
5.7.3 Primary Method. Fluorescent Penetrant.
5.7.3.1 1.1.1
NDI Equipment and Materials. (Refer to Appendix B.) Inspection equipment is
listed in Table 1-7. AMS 2644 level 3 penetrant materials shall be selected from tst in Table 1-8. Parts
requiring flouresctranent penetrant inspection shall be cleaned prior to inspection with n--Propyl
Bromide (vapor degreasing only)(Table 1--8), DS--108 (Table 1--8), Electron (Table 1--8), Positron
(Table 1- 8). DS--108, Electron, Positron must be followed by an acetone (Table 1--8 approved li8)
rinse or wipe: or drying until there is no visible solvent residue left on parts.
5.7.3.2 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.
5.7.3.3 Access. Not applicable.
5.7.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.
5.7.3.5 Inspection Procedure.
Perform fluorescent penetrant inspection. Refer to Fluorescent
Penetrant Method, paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 5-7.
5.7.3.6 Marking and Recording of Inspection Results.
Mark and record inspection results as
required by paragraph 1.3.
5.7.4
Backup Method. None required.
5.7.5
System Securing. Clean the links to remove inspection media. Refer to Post Cleaning and
Restoration of Part or Area After NDI, paragraph 1.4.16. The engine requires installation in
accordance with the applicable technical manuals listed in Table 1-1.
5.8 AFT ENGINE MOUNT SUPPORT (ET).
5.8.1
Description (Figure 5-1, Index No. 8). The aft engine mount is secured to the engine deck
and two links attached to the engine.
5.8.2
Defects. Cracks may occur anywhere on the mount support. No cracks are allowed.
5.8.3
Primary Method. Eddy Current.
5.8.3.1 NDI Equipment and Materials. (Refer to Appendix B.)
a. Eddy Current Inspection Unit
b. Probe, straight, shielded surface, 2 MHz
c. Probe, right angle, shielded surface, 2 MHz, 90_ 1/2 inch drop
d. Probe, Adapter
e. Cable Assembly
f. Reference Block, three-notched titanium (0.008, 0.020, 0.040 EDM notches)
g. Teflon Tape, refer to Table 1-8
h. Aircraft Marking Pencil, refer to Table 1-8
