This report presents the results of a Normal Operations Safety Survey (NOSS) trial conducted at two sites within FINAVIA during August 2006. Sixty-three NOSS observations were made by six observers across ACC, Approach and Tower settings. The number of observations made during this trial is approximately a third of what one would expect for a full NOSS study in an organisation like FINAVIA and as such the results may not reflect all aspects of the operation. Accordingly results and conclusions drawn from this trial must be treated with a degree of caution.