Pakistan, Aug. 14 -- An Air India Airbus A320 briefly lost key flight controls during a 300-foot altitude drop earlier this month. The incident injured 24 people aboard the aircraft. The plane was operating flight AI2379 from Phuket to Delhi on August 4. It later landed safely in Delhi despite the serious incident.

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According to a preliminary Airbus analysis reviewed by Reuters, all three hydraulic systems temporarily lost pressure. The aircraft's elevators and ailerons became unavailable for about four seconds. These flight-control surfaces help pilots control the aircraft's pitch and roll. During that period, the plane pitched upward before the systems recover...