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Thread: Boeing Damages Air Force One
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Old 13th May 2017, 06:38
  #19 (permalink)  
DaveReidUK
 
Join Date: Jan 2008
Location: Reading, UK
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It's the tools and equipment used to work on an oxygen system that require to be clean and free from contamination by oil, grease, etc.

Every mechanic learns that as part of their training.
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