Refer to Eddy Current Method, paragraph 1.4.11. Set up on test block as follows:
Null probe on test block.
Adjust phase as required to obtain horizontal lift-off.
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.)
18.104.22.168 Inspection Procedure. Refer to Eddy Current Method, paragraph 1.4.11 and Figure 3-14.
Place probe on a good area in the inspection location and null. Adjust phase as required
to obtain horizontal lift-off.
Inspect the part.
Any signal similar to the notches in the test block is cause for rejection.
Either probe identified in paragraph 22.214.171.124 may be used depending primarily on the ease of accessibility
and user friendliness. If the probes are changed, steps 126.96.36.199 b. (1), (2), and (3) shall be repeated each
time a change is made.
188.8.131.52 Marking and Recording of Inspection Results. Mark and record the inspection results as required by paragraph
Backup Method. None required.
System Securing. The main transmission compressor drive adapter requires installation in accordance with the
applicable technical manuals listed in Table 1-1.
MAIN TRANSMISSION APU DRIVE FLANGE (MT).
Description (Figure 3-1. Index No. 15). The main transmission APU drive flange is externally splined which
provides for connection of the number 7 APU drive shaft and the main transmission.
Defects. This inspection is used to verify crack indications found visually on the main transmission APU drive
flange. No cracks are allowed.
Primary Method. Magnetic Particle.
184.108.40.206 NDI Equipment and Materials. (Refer to Appendix B.)
Magnetic Particle Inspection Probe/Yoke
Fluorescent Magnetic Particles, refer to Table 1-8
Consumable Materials, refer to Table 1-8
Aircraft Marking Pencil, refer to Table 1-8