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This study deals with the problem of retaking identical or parallel mental ability tests. This can lead to difficulties in the assessment for prestigious jobs like pilot or ab initio pilot candidate positions, where test preparation is common and a large training industry has been established. We investigated practice effects on test-takers’ performance and reliability as well as validity of a spatial ability task. The task was administered ten times, five minutes each, in a sample of 156 ab initio pilot applicants. A performance plateau was reached after the fifth trial, reliability and validity were not affected negatively, they even tend to rise. Consequences for diagnostics are discussed and a brief outlook on the incorporation of the spatial ability task in a multiple task performance test battery is given.