What happened
During an approach to Madras, the aircraft's primary hydraulic system ceased to function correctly. While the malfunction occurred while en route, the crew did not accurately diagnose the nature of the system failure during the flight. Upon arriving at Madras Airport and completing the touchdown, the flight crew discovered that the braking capabilities were significantly compromised due to the hydraulic issue.
Because the brakes were only partially operational, the aircraft was unable to decelerate sufficiently within the available runway length. The plane subsequently overran the end of the runway, where it collided with various obstacles. The impact caused the loss of the undercarriage. Despite the severity of the excursion, all 31 occupants were successfully evacuated from the aircraft type without injury. The aircraft was later determined to be a total loss.
Findings
Investigations into the incident revealed that the malfunction of the primary hydraulic system was triggered by the installation of an incorrect gasket during maintenance procedures.