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Crane Inspection Hook
Remove from service if throat opening is stretched more than 5% or ¼ inch.
Remove from service if the hook has any visibly apparent bend or twist from the plane of the unbent hook.
Remove from service if cracks or excessive wear are present or visible.
Explanation: The 'hook' has, geometrically, a major 2D component, and the 'plane of the hook' would be the 2D surface running through the centre-line of the hook.
Here, they are talking about that plane when the hook is 'normal' — i.e. not bent.
Tony M France Local time: 03:28 Native speaker of: English PRO pts in category: 4