TM 1-1520-265-23
2.19 MAIN ROTOR BLADE TIP CAP FAIRING (ET).
2.19.1 Description (Figure 2-1. Index No.19). The main rotor blade tip cap fairing is located at the tip end of the main
rotor blade where it forms the tip end contour of the blade airfoil.
2.19.2 Defects. This inspection is used to verify crack indications found visually on the main rotor blade tip cap fairing.
No cracks are allowed.
2.19.3 Primary Method. Eddy Current.
2.19.3.1 NDI Equipment and Materials. (Refer to Appendix B.)
a.
Eddy Current Inspection Unit
b.
Probe, straight, shielded surface, 100 KHz-500 KHz
c.
Probe, right angle, shielded surface, 100 KHz-500 KHz, 900 1/2 inch drop
d.
Cable Assembly
e.
Reference Block, three-notched aluminum (0.008, 0.020, 0.040 EDM notches)
f.
Teflon Tape, refer to Table 1-8
g.
Aircraft Marking Pencil, refer to Table 1-8
2.19.3.2 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 this procedure. If required, the main rotor blade tip cap fairing shall be removed in accordance
with the applicable technical manuals listed in Table 1-1.
2.19.3.3 Access. Not applicable.
2.19.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
paragraph 1.4.4.
2.19.3.5 NDI Equipment Settings.
a.
Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-1 9e1.
Frequency F1
- 200 KHz
F2
- off
HdB
- 57.0
VdB
- 69.0
Rot
- 56"
Probe drive - mid
LPF
- 100
HPF
- 0
H Pos
- 80%
V Pos
- 20%
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