TM 1-1520-265-23
Change 3
2-15
2.8.3.5 NDI Equipment Settings.
a. Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19eII.
Frequency F1
- 1000 KHz
F2
- off
HdB
- 57.0
VdB
- 69.0
Rot
- 30_
Probe drive
- mid
LPF
- 100
HPF
- 0
H Pos
- 80%
V Pos
- 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.)
2.8.3.6 Inspection Procedure. Refer to Eddy Current Method, paragraph 1.4.11 and Figure 2-8.
a. Place probe on good area in the inspection location and null. Adjust phase as required to
obtain horizontal lift-off.
b. Inspect the part.
c. Any signal similar to the notches in the test block are cause for rejection.
NOTE
Either probe identified in paragraph 2.8.3.1 may be used depending primarily on the
ease of accessibility and user friendliness. If the probes are changed, steps 2.8.3.5
b. (1), (2), and (3) shall be repeated each time a change is made.
2.8.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as
required by paragraph 1.3.
2.8.4
Backup Method. None required.
2.8.5
System Securing. The antiflap bracket, if removed, requires installation in accordance with
the applicable technical manuals listed in Table 1-1.
2.9 DROOP STOP SUPPORT RING NUT (ET).
2.9.1
Description (Figure 2-1, Index No. 9). The droop stop support ring nut holds the droop stop
support ring and outer sleeve assembly in place on the spindle.
2.9.2
Defects. The inspection is used to verify crack indications found visually on the droop stop
support ring nut. No cracks are allowed.
