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To protect the air conditioning system of a turbine powered aircraft from contamination by traces of oil in the air bled from main engines and APU, a catalyc converter was developed for each, and put in service in the British Aerospace 146. The development procedures and flight hardware are described, data for sizing and pressure drop are presented, and limited service experience outlined.

In connection with the development of catalytic converter to eliminate traces of oil from turbine engine and APU bleed air, some experiments were conducted to better understand the compounds present in the cabin air as well as possible compounds originating from the turbine oil. Samples of cabin air were taken from an aircraft in flight and analyzed by means of gas chromatography/mass spectroscopy. The compounds as determined by this method, were then compared with the compounds found in air which had been passed over synthetic oil (Mil L 23699 type) heated to various elevated temperatures. This paper describes the experiments and presents the data obtained.