Itaituba

Loss of control on landing for unknown reasons. It was not possible to determine whether the heavy rainfall that occurred in the region effectively contributed to the loss of control of the aircraft on the ground. In addition to the narrowing of the runway, the position of the drainage ditch became an obstacle, which prevented the aircraft from decelerating safely, culminating in the collision of the front landing gear against it and the impact of the propeller on the ground.

The accident was the consequence of the following factors:
1) Adverse Weather Conditions - Contributed
Weather conditions were unfavorable at the destination location for visual flight. There was a layer of fog near the forest.
2) Poor Instruction - Contributed
The Commander was not qualified to fly that type of aircraft and was not instrument cleared.
3) Disabled Judge - Contributed
The pilots continued the flight, even knowing the adverse weather conditions at their destination.
4) Flight Indiscipline - Contributed
One of the pilots was not qualified to fly that aircraft and, in addition, there was intentional disobedience to the air traffic rules and regulations, regarding the non observance of the minimum IFR flight level in the industry.
5) Disabled Oversight - Contributed
There was poor oversight of the responsible company by letting an unqualified pilot operate the aircraft.
6) Weak Cabin Coordination - Contributed
IFR flight without complying with IMA 100-12 rules, conducted below the limits and outside the descent profile are indications that there was no planning/coordination in the operations performed in the cockpit.

It is believed that the loss of control was the consequence of a power loss on one engine or maybe both. The cause of the loss of power may be caused a contaminated fuel.