6.8 PILOT/CPG COLLECTIVE STICK ROTOR HOUSING (ET).
6.8.1 Description (Figure 6-1. Index No. 8). The task is typical for either the pilot or CPG collective rotor housing. The
pilot/CPG collective rotor housings are a part of the collective stick grips.
6.8.2 Defects. This inspection is used to verify crack indications found visually on the pilot/CPG collective stick rotor
housing. No cracks are allowed.
6.8.3 Primary Method. Eddy Current.
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, and 0.40 EDM notches)
f. Teflon Tape, refer to Table 1-8
g. Aircraft Marking Pencil, refer to Table 1-8
184.108.40.206 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 this procedure. If required, the pilot/CPG collective stick rotor housing shall be removed in
accordance with the applicable technical manuals listed in Table 1-1.
220.127.116.11 Access. Access is through the pilot/CPG crew stations.
18.104.22.168 Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
22.214.171.124 NDI Equipment Settings.
Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19e
- 200 KHz
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.)