Aircraft Accident Investigation Report No. ACCID01/06
Aircraft Accident Investigation Report No. ACCID01/06
Aircraft Accident Investigation Report No. ACCID01/06
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CityU Professional Services Ltd<br />
Failure Analysis of a Towbar<br />
Department of Physics & Materials Science<br />
City University of Hong Kong<br />
Figure 4-13 shows the bottom surface and end of the head assembly. A number of indentation<br />
marks as marked in red arrows were identified.<br />
Figure 4-13 : Bottom surface of the metal block of the head assembly with indentation marks<br />
The broken bolts of about 16 mm in diameter were then examined. It can be seen in Figure 4-14<br />
that fracture occurred at the interface position between the top plate of the head assembly and<br />
the plate of the head-to-tube connector. The fracture surfaces of this bolt are shown in Figure 4-<br />
14. The fracture surface were very flat, and contained evidence that they were shear fractured.<br />
Figure 4-15 illustrates that fracture occurred between the top plate and the head-to-tube<br />
connector.<br />
(a) Bolt broken in two<br />
(b) Fracture surfaces of broken bolt<br />
Figure 4-14 : Broken bolt of about 16 mm in diameter<br />
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