Loss of altitude incident on AI2379 resulting in 17 injuries. The A320 neo has three independent hydraulic systems that power critical functions including the primary flight controls, landing gear, nose-wheel steering, thrust reversers, flaps and slats, and braking systems. Air India pilot's psychoactive substance test requires confirmation after altitude-loss incidentThe incident has been classified as a serious incident and is being investigated by the Aircraft Accident Investigation Bureau (AAIB). Neither Air India nor the Ministry of Civil Aviation has mentioned the technical fault indications in their respective press statements. Air India’s initial statement attributed the momentary loss of altitude to “in-flight turbulence”, but subsequent statements did not repeat the reference to turbulence.