The equipment of an oxygen supply installation must be kept absolutely free of oil or grease traces as: - ATPL

Question id 491 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

These Substances Mixed With Oxygen Could Catch Fire In The Presence Of A Spark.

The oxygen system would be contaminated.

These substances could plug the oxygen masks filters.

These substances catch fire spontaneously in the presence of oxygen under pressure.