TM 1-1520-253-23
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. (Refer to standard instrument display shown in
6.2.3.6
Inspection Procedure. Refer to Eddy Current Method, paragraph 1.4.11 and Figure 6-2.
a. Place probe on part in the inspection locations 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 is cause for rejection.
NOTE
Either probe identified in paragraph 6.2.3.1 may be used depending primarily on the ease of
accessibility and user friendliness. If the probes are changed, steps 6.2.3.5 b. (1), (2), and (3)
shall be repeated each time a change is made.
6.2.3.7 Marking and Recording of Inspection Results. Mark and record as required by paragraph1.3.
6.2.4
Backup Method. Not required.
6.2.5 System Securing. The connecting link, if removed, requires installation in accordance with the applicable
technical manual listed in Table 1-1. Secure applicable work platforms and panels.
6.3.1 Description (Figure 6-1, Index No. 3). Control inputs from the cockpit are transmitted through adjustable and
nonadjustable mechanical linkage to the Integrated Lower Control Actuator (ILCA). The ILCA then transmits individual
control motions to the first and second stage mixing units. The mixed outputs are then transmitted through a series of
push-pull tubes to the upper dual-boost actuators attached to the forward and aft swashplates.
6.3.2
Defects. This inspection is to verify cracks found visually. No cracks are allowed.
6.3.3
Primary Method. Magnetic Particle.
6.3.3.1
NDI Equipment and Materials. (Refer to Appendix B.)
a. Magnetic Particle Inspection Probe/Yoke
b. Magnetometer
c. Black Light
d. Fluorescent Magnetic Particles
e. Consumable Materials, refer to Table 1-8
f.
Aircraft Marking Pencil, refer to Table 1-8
6-4
