Lack of Chox is the same as lack of Seat belts, they both need to be fitted before they are needed.
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However worth remembering Chox come in different sizes, if large energy is involved, suggest big Chox used.
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Also to note, during Engine runs, Chox should be a little distance from tyres, touching the tyres has caused many aircraft to move.
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Good to hear all involved getting better.
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I hope Airbus has a Learn Culture, not a Blame one.