TM 1-1520-264-23
4.17.3.7
Marking and Recording of Inspection Results. Mark and record the inspection results as required by
paragraph 1.3.
4.17.4
Backup Method. None required.
4.17.5
System Securing. None required. Secure the pylon nose fairing.
4.18
TADS/PNVS SUPPORT FITTING (ET).
4.18.1
Description (Figure 4-1. Index No. 18).
The TADS/PNVS is located at F.S. 33.50. This lower support fitting
supports and separates the TADS/PNVS from the forward cockpit area. It is constructed of aluminum alloy.
4.18.2 Defects. This inspection is used to verify crack indications found visually on the TADS/PNVS support fitting. No
cracks are allowed.
4.18.3
Primary Method. Eddy Current.
4.18.3.1
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,90
° 1/2 inch drop
d. Cable Assembly
e.
Reference Block, three-notched aluminum (0.008, 0.20, and 0.040 EDM notches)
f.
Teflon Tape, refer to Table 1-8
g. Aircraft Marking Pencil, refer to Table 1-8
4.18.3.2
Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the
TADS/PNVS removed in accordance with the applicable technical manuals listed in Table 1-1.
4.18.3.3
Access. Not applicable.
4.18.3.4
Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
paragraph 1.4.4.
4.18.3.5
NDI Equipment Settings.
a.
Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19e
11.
Frequency F1
- 200 KHz
F2
- off
HdB
- 57.0
VdB
- 69.0
Rot
- 56°°
Probe drive - mid
LPF
- 100
HPF
-0
H Pos
- 80%
VPos
- 20%
4-44
