According to this article
Why the shortages? There is no shortage of volonteers for AAC. So are just not enough making it through training? Or is retention the problem? Or are the current figures just a temporary blip caused by the long lead times in the training programmes?
The Army had the largest shortfall of helicopter pilots in terms of percentage of total strength. It only met 83 per cent of its total strength. The RAF had 86 per cent of its required helicopter crew strength while the Royal Navy is nearly at full strength with 94 per cent of its crew requirement met.