The Countess of Mar asked Her Majesty's Government: Further to the Written Answer by the Lord Davies of Oldham on 19th October (WA 126), how, in the event of a system failure and a contaminated air event occurring, aircrews know that such an event has occurred in the absence of monitoring devices when the contaminated air is caused by compounds, such as carbon monoxide, that have no odour. [HL2313]

Lord Davies of Oldham: In the absence of odour, and in the absence of any discernible effects, aircrew will not know that a contaminated air event has occurred.  In such a case reliance is placed upon routine maintenance actions to find and fix the system failure.

24 November 2005