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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during operation, the shear load is transmitted through the two shear bolts.<br />
The middle bolt is of size of about 16 mm in diameter, and will take the<br />
shear load when the two shear bolt fail. The function of the shear bolts is<br />
to act as a safeguard against turning too abruptly, or at an angle which is<br />
too sharp during the pushback operation.<br />
In this accident, all three bolts attaching the towbar head assembly to the<br />
head-to-tube connector were broken. As a result, the towbar head assembly<br />
liberated from the towbar. The upper plate of the head assembly, broken<br />
off from the main body near its welded joint, ended underneath the nose<br />
wheel. The lower plate was bent by almost 110 o and rested at the back of<br />
the nose wheel (as shown in Figure 1.4.3 to 1.4.6).<br />
Figure 1.4.3<br />
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