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 3-4 : Details of nose undercarriage to towbar head assembly attachment<br />
Figure 3-5 shows that the attachment between the head assembly and the main tube of the<br />
towbar was by three bolts. The bolts at the two ends were shear bolts. The middle one is<br />
fitted into a hole larger than a normal bolthole, so that during operation, the shear load is<br />
transmitted through the two shear bolts. The middle bolt is of size of about 16 mm (5/8-inch)<br />
in diameter, and will take the shear load when the two shear bolt fail. In particular, the shear<br />
bolts act as safeguard against turning too abruptly, or at an angle which is too sharp during<br />
the pushback operation.<br />
Figure 3-5 : The wheels on towbar were retracted up after attaching towbar to tractor<br />
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