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An oxygen supply system must be kept absolutely free of oil or grease as…

  • A
    these substances could block the oxygen mask filters.
  • B
    these substances catch fire spontaneously in the presence of oxygen.
  • C
    the breathing oxygen would be contaminated by these substances.
  • D
    these substances mixed with oxygen could catch fire in the presence of a spark.
OXYGEN SYSTEMS SAFETY PRECAUTIONS
Good housekeeping practices are necessary in the vicinity of oxygen system as any flammable material will burn more fiercely in the presence of oxygen than in air. This is particularly true with combustibles such as grease, lubricating oil, asphalt, etc. The importance of cleanliness cannot be overstressed. Never permit oil, grease, or other combustibles to come in contact with any part of the aircraft's oxygen system. Do not handle oxygen equipment with oily hands, gloves, cloths, or tools.
  • When oil or grease comes into contact with oxygen there is the possibility of a severe chemical reaction and spontaneous combustion. 

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