TM 1-1520-265-23
4.4
FLUID IN HONEYCOMB CORE PANELS AND STRUCTURES (RT).
4.4.1 Description (Figure 4-1. Index No. 4). This inspection is applicable to parts or components made of
metallic/nonmetallic skins bonded to metallic/nonmetallic cores and laminations of facings of metal or fiberglass panels.
The structural assembly components identified for inspection are: honeycomb panels, cabin floors, drive shaft covers,
access doors and covers, cowlings, and work platforms.
4.4.2 Defects. Fluid in honeycomb core of the components listed above.
4.4.3 Primary Method. Radiography.
WARNING
Radiation Hazard Assure compliance with all applicable safety precautions set forth in TM 55-
1500-335-23 (Nondestructive Inspection Methods manual) listed in Table 1-1. A hazard
associated with exposure to ionizing radiation is that serious damage can be inflicted without
pain, burning, or other sense of discomfort during the exposure period. Radiation protection
shall be utilized in accordance with AR40-14/DLAR 1000.28.
4.4.3.1
NDI Equipment and Materials. (Refer to Appendix B.)
a.
X-ray Unit
b.
Tripod, X-ray tubehead stand
c.
Film Processor
d.
Film, Ready Pack 14 inch x 17 inch
e.
Marking Material, refer to Table 1-8.
4.4.3.2
Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance in accordance with
applicable technical manuals listed in Table 1-1.
4.4.3.3
Access. Not applicable.
4.4.3.4
Preparation of Part. The identified area of interest shall be thoroughly cleaned. Refer to Preparation of Part or
Area for NDI, paragraph 1.4.4.
4.4.3.5
NDI Equipment Settings.
a.
Refer to Radiographic (X-ray) method, paragraph 1.4.10.
b.
Typical equipment settings, inspection and exposure data are given in Figure 4-4.
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