Breathalyser limit

For breathalyser testing, the prescribed breath/alcohol alcohol limits for ATCO’s, pilots, and cabin crew is 9 microgrammes in 100 millilitres of breath [6].

Blood alcohol concentration

The Department of Transportation limit for pilots in the UK is 20mg of alcohol for every 100ml of blood, which is one quarter of the current drink-driving limit in England (80mg/100ml) [10]. The UK Civil Aviation Authority is currently proposing that a maximum Blood Alcohol Concentration (BAC) limit of just 0.02% should be imposed on UK pilots [11].