TM 1-1520-253-23
ENGINE TRANSMISSION QUILL SHAFT (MT).
3.18.1 Description (Figure 3-1. Index No. 18). The engine transmission quill shaft is a splined shaft that transmits
power from the engine to the engine transmission.
3.18.2 Defects. Defects may occur anywhere on the surface of the quill shaft. No cracks are allowed.
3.18.3 Primary Method. Magnetic Particle.
3.18.3.1
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
NOTE
Hand-held magnetic coil may be used. Refer to paragraph 1.4.8.1.2 and Figure 1-6.
3.18.3.2
Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the engine
transmission quill shaft removed in accordance with the applicable technical manuals listed in Table 1-1.
3.18.3.3
Access. Not applicable.
3.18.3.4
Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
3.18.3.5
NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.
3.18.3.6
Inspection Procedure. A magnetic field shall be applied to the part perpendicular to the orientation of
possible cracks. Position required for this inspection is illustrated in Figure 3-18.
a.
Select AC on the AC/DC power switch.
b.
Place probe/yoke on part at Position 1 as shown.
c.
Press the test switch and apply a light coat of magnetic particle media at the same time. Remove the
media momentarily before removing the current. Current should be applied for no more than five seconds.
d.
Inspect for cracks using the black light.
