FUSELAGE AND EMPENNAGE A CCESS DOORS, COVERS, PANELS, SKINS, AND
FAIRINGS- METAL (ET).
Description (Figure 4-1. Index No. 2).
This inspection is applicable to all access doors, covers, panels, skins, and
fairings constructed of nonferrous metallic materials.
Defects. Defects may occur anywhere on the surface of the components listed above. The primary purpose of
this inspection is for: (1) confirmation of crack indications identified by visual inspections; (2) verifications that dents,
scratches, or gouges do not conceal cracks; and (3) locating the ends of confirmed cracks so that stop drilling may be
performed. No cracks are allowed.
Primary Method. Eddy Current.
188.8.131.52 NDI Equipment and Materials. (Refer to Appendix B.)
Eddy Current Inspection Unit
Probe, straight, shielded surface, 100 KHz-500 KHz
Probe, right angle, shielded surface, 100 KHz-500 KHz, 90
1/2 inch drop
d. Cable Assembly
Reference Block, three-notched aluminum (0.008, 0.020, and 0.040 EDM notches)
Reference Block, three-notched magnesium (0.008, 0.020, and 0.040 EDM notches)
Reference Block, three-notched titanium (0.008, 0.020, and 0.040 EDM notches)
Teflon Tape, refer to Table 1-8
Aircraft Marking Pencil, refer to Table 1-8
184.108.40.206 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance. If required, access
doors, covers, panels, and fairings shall be removed in accordance with the applicable technical manuals listed in Table
220.127.116.11 Access. The components are generally accessed from outside the helicopter.
18.104.22.168 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
22.214.171.124 NDI Equipment Settings.
Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-1 9e
- 200 KHz
aluminum and magnesium) (30