TM 1-1520-264-23
Figure 4-22.
Engine Access and Ventilation Door Assembly Rig Connecting Link
4.23.3.2
Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the engine
removed in accordance with the applicable technical manuals listed in Table 1-1.
4.23.3.3
Access. Not applicable.
4.23.3.4
Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
paragraph 1.4.4.
4.23.3.5
NDI Equipment Settings.
a.
Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-1 9e
”.
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%
b.
Refer to Eddy Current Method, paragraph 1.4.11. Set up on test block as follows:
(1)
Null probe on test block.
(2)
Adjust phase as required to obtain horizontal lift-off.
(3)
Move probe over all three notches in test block. Adjust gain to obtain a three block vertical signal when
probe is passed over 0.040-inch notch in test block. (See the standard instrument display shown in
Figure 1-7.)
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