TM 1-1520-265-23
4.12.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as required by paragraph
1.3.
4.12.4
Backup Method. None required.
4.12.5
System Securing. The gunner's window and retainer assembly, if removed, require installation in accordance
with the applicable technical manuals listed in Table 1-1.
4.13
TROOP/CARGO DOOR LOWER TRACK (ET).
4.13.1
Description (Figure 4-1. Index No.13). These rear sliding doors on either side of the helicopter cabin open to
the troop/cargo compartment. This inspection applies to the lower track on which the doors slide.
4.13.2
Defects. This inspection is used to verify crack indications found visually on the troop/cargo door lower track.
No cracks are allowed.
4.13.3
Primary Method. Eddy Current.
4.13.3.1 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
4.13.3.2 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 cargo door shall be removed in accordance with the applicable
technical manuals listed in Table 1-1.
4.13.3.3 Access. Not applicable.
4.13.3.4 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
paragraph 1.4.4.
4.13.3.5 NDI Equipment Settings.
a.
Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-1 9e1.
Frequency Fl
- 200 KHz
F2
- off
HdB
- 57.0
VdB
- 69.0
Rot
- 56°
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