6.21 CPG TO PILOT LONGITUDINAL F.S. 82.80 CONTROL BRACKET (ET).
Description (Figure 6-1. Index No. 21). The CPG to pilot longitudinal F.S. 82.80 control bracket holds the
bellcrank connecting the push-pull rods from the CPG to the pilot's longitudinal controls.
Defects. This inspection is used to verify crack indications found visually on the CPG to pilot longitudinal F.S.
82.80 control bracket. No cracks are allowed.
Primary Method. Eddy Current.
NDI Equipment and Materials. (Refer to Appendix B.)
Eddy Current Inspection Unit
Probe, straight, shielded surface, 100 KHz-500 KHz
Probe, right angle, shielded surface, 100 KHz-500 KHz, 90 °
1/2 inch drop
Reference Block, three-notched aluminum (0.008, 0.020, and 0.040 EDM notches)
Teflon Tape, refer to Table 1-8
Aircraft Marking Pencil, refer to Table 1-8
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 CPG to pilot longitudinal F.S. 82.80 control bracket
shall be removed in accordance with the applicable technical manuals listed in Table 1-1.
Access. Access is through the FAB and controls, and flight controls covers (Figure 1-4, Items B80R and
Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
NDI Equipment Settings.
Make the following initial settings on the Eddy Current Inspection Unit, NORTEC-19e11.
- 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.)