(also bell-crank lever)
A lever with two arms which have a common fulcrum at their junction.
- The sailor who was carrying out the maintenance on the aircraft found that there was a bit too much lateral movement in the bell crank, and he alerted his superior officer to the problem.
- The bell crank has to move over to the other end of the valve gear cross-shaft as a result of all this.
- The main advantage is to maintain the area exterior to the bell cranks as unobstructed as possible.
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