This soon resulted in British Aircraft Corporation obtaining a number of inner lower booms with time in service greater than 7, 000 flights.
12.
A pair of new inner lower booms had been installed in VH-RMQ in 1964 and had been in service for only 8, 090 flights.
13.
The Court found that the accident was caused by a fatigue crack in the lower boom of the main spar in the left wing.
14.
Scoring of the wall of the hole and the absence of an interference fit left the inner lower boom vulnerable to developing fatigue cracks at Station 143.
15.
Approximately 5000 flights after new inner lower booms were installed in 1964, numerous fatigue cracks began to develop in both the forward and rear edges of the hole.
16.
A 50 % reduction of mean time to failure does not adequately explain why the inner lower boom in VH-RMQ should have failed before reaching its retirement life.
17.
The life of 11, 400 flights for the Viscount inner lower boom was based on safety factors of 3.5 for the ground-air-ground cycle and 5.0 for fatigue damage due to atmospheric gusts.
18.
The fatal fatigue crack in the inner lower boom had initiated at a bolt hole at Station 143, the rearmost of five bolt holes for attachment of the inner engine nacelle to the lower boom.
19.
The first attempt to fly the aircraft was made by Gabriel Voisin on 28 February 1907 at the Polygon de Vincennes, but the lower booms supporting the tail failed when he attempted to lift off.
20.
The fatal fatigue crack in the inner lower boom had initiated at a bolt hole at Station 143, the rearmost of five bolt holes for attachment of the inner engine nacelle to the lower boom.
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