The Indian Air Force (IAF) has grounded its entire fleet of HPT-32 initial trainer aircraft owing to a series of crashes and engine failures. This comes at a time when the force is facing an acute shortage of efficient pilots. Authoritative sources in the IAF said recurrent engine failure of the Hindustan Piston Trainer (HPT)-32 aircraft — stationed at the Air Force Academy (AFA) in Hyderabad — is the reason behind the grounding since last month.“The entire fleet of the HPT-32 has not been flying," a senior IAF official said, requesting anonymity....