A Dornier 228 aircraft operated by the Indian Coast Guard disappeared over the sea during a surveillance mission near Chennai. The aircraft departed from Chennai Airport at 18:05 local time, flying to the Palk Bay area approximately 170 nautical miles away. Last radio contact was reported at 21:00, with the aircraft departing its patrol area and returning to Chennai. Radar data showed the aircraft last seen at 21:23, 95 NM south of Chennai at 9000 feet, and was located at a depth of 995 meters off Pichavaram in Cuddalore district. The ICG’s Board of Inquiry (BOI) determined a power failure to the AHRU caused the loss of control, leading to the disappearance.A Dornier 228 aircraft operated by the Indian Coast Guard disappeared over the sea during a surveillance mission near Chennai. The aircraft departed from Chennai Airport at 18:05 local time, flying to the Palk Bay area approximately 170 nautical miles away. Last radio contact was reported at 21:00, with the aircraft departing its patrol area and returning to Chennai. Radar data showed the aircraft last seen at 21:23, 95 NM south of Chennai at 9000 feet, and was located at a depth of 995 meters off Pichavaram in Cuddalore district. The ICG’s Board of Inquiry (BOI) determined a power failure to the AHRU caused the loss of control, leading to the disappearance.