TM 1-1520-265-23
5.3.3.3
Access. Location of these parts varies considerably. Refer to Figure 1-4 and Table 1-2 to locate
applicable access provisions.
5.3.3.4
Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.
5.3.3.5
Inspection Procedure. Perform fluorescent penetrant inspection. Refer to Fluorescent Penetrant
Method, paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 5-3.
5.3.3.6
Marking and Recording of Inspection Results. Mark and record the inspection results as required by
paragraph 1.3.
5.3.4
Backup Method. None required.
5.3.5
System Securing. Clean the part(s) to remove inspection media. Refer to Post Cleaning and
Restoration of Part or Area After NDI, paragraph 1.4.16. The part(s), if removed, requires installation in accordance with
the applicable technical manuals listed in Table 1-1.
5.4 AIR INLET ASSEMBLY AND BLEED-AIR EXHAUST SLOTS (ET).
5.4.1
Description (Figure 5-1. Index No. 4). The aluminum air inlet assembly is at the front of the engine
through which air is directed into the engine. The bleed air exhaust slots are in the forward inboard cone area.
5.4.2
Defects. This inspection is used to verify crack indications found visually on the air inlet and around the
bleed air exhaust slots. No cracks are allowed.
5.4.3
Primary Method. Eddy Current.
5.4.3.1
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
5.4.3.2
Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance in accordance
with the applicable technical manuals listed in Table 1-1.
5.4.3.3
5.4.3.3 Access. Not applicable.
5.4.3.4
Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
paragraph 1.4.4.
5-5
