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Final Report - Interstate Aviation Committee (MAK)

The cause of the An-26B-100 RA-26085 aircraft crash was the crew's violation of the established instrument approach procedure to Palana aerodrome, which was manifested in flying with significant deviation from the set route and descent well below the established minimum descent height (MDH) under weather conditions that excluded stable visual contact with ground landmarks, leading to the collision of the aircraft with a coastal cliff in controlled flight, its destruction, and the death of the crew and passengers.

Contributing factors to the accident may have included:

- The crew's failure to execute a missed approach with the acquisition of the established minimum safety altitude (MSA) when information about the bearing indicated a significant deviation of the aircraft from the established approach procedure;

- The absence in the Palana aerodrome dispatcher's work technology of actions in the presence of information about the bearing indicating a significant deviation of the aircraft from the established approach scheme, as well as the dispatcher's passivity when such information was available;

- The lack of warning signals from the early ground proximity warning system under conditions that should have triggered it. It is not possible to determine the reason for the absence of the warning signals;

- The overestimation of the barometric altimeter readings in the final phase of the flight due to the specific airflow around the steep coastline creating a low-pressure zone and the overestimation of the variometer readings, the cause of which cannot be determined.