TM 1-1520-265-23
6-22
a. Place probe on a 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 6.11.3.1 may be used depending primarily on the
ease of accessibility and user friendliness. If the probes are changed, steps 6.11.3.5b.
(1), (2), and (3) shall be repeated each time a change is made.
6.11.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as
required by paragraph 1.3.
6.11.4 Backup Method. None required.
6.11.5 System Securing. The push-pull rods, if removed, require installation in accordance with
the applicable technical manuals listed in Table 1-1.
6.12 PILOT COLLECTIVE STICK BELLCRANK SUPPORT (ET).
6.12.1 Description (Figure 6-1, Index No. 12). The pilot structural collective stick bellcrank support
provides not only structural support, but also a pivot point for the collective stick bellcrank.
6.12.2 Defects. This inspection is used to verify crack indications found visually on the pilot
collective stick bellcrank support. No cracks are allowed.
6.12.3 Primary Method. Eddy Current.
6.12.3.1 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, 90_ 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
6.12.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance.
A partial inspection for cause (visual indications, sites of mechanical damage, corrosion, etc.) may
be performed on all exposed surfaces of the installed part using applicable positions of this
procedure. If required, the pilot collective stick bellcrank support shall be removed in accordance
with the applicable technical manuals listed in Table 1-1.
6.12.3.3 Access. Access is by removal of the boot, cover and panel which is behind the pilot’s seat
in crew compartment.
