Brazil

The following factors were identified:
- Attention – undetermined.
It was found the possibility that the PT-ONJ aircraft crew had their attention (focused vision) on the runway at the expense of maintaining proper separation with the terrain on a visual approach.
- Piloting judgment – a contributor.
Regarding the approach to landing profile, there was an inadequate assessment of the aircraft's operating parameters, since the downwind leg was elongated by a significantly greater distance than that expected for a "Category B" aircraft in landing procedures under VFR.
- Memory – undetermined.
It is likely that, based on the experience of ten years of operation in a company governed by the RBAC 121, the PIC procedural memory has influenced the decisions made concerning the conduct of the aircraft. The habit of performing long final approaches in another type of operation may have activated his procedural memory, involving cognitive activities and motor skills, making the actions automated in relation to the profile performed in the accident.
- Flight planning – undetermined.
A possible non-use of the available aeronautical charts (CAP 9453 and WAC 3189), which were intended to meet the needs of visual flight, may have contributed to low situational awareness about the characteristics of the relief around the SNCT Aerodrome and the presence of the power grid that interfered with the aircraft's landing approach.

Following a wrong approach configuration on part of the crew, it was determined that the airplane landed about 600 metres from the runway end. In such conditions, the airplane could not be stopped within the remaining distance.
The following contributing factors were identified:
- Both pilots knew each other well and often flew together, thus it is possible that they over-relied on each other during the final phase of the flight,
- This over-confidence led the crew to neglect certain parameters related to the approach manoeuvre,
- Lack of crew coordination,
- Post-accident medical examinations revealed that the pilot-in-commands' (PF) lack of reaction to the pilot monitoring's (PM) warnings, and his impaired alertness, could indicate that he was suffering from the effects of alcohol and fatigue, reducing his performances,
- The pilots' decision to continue with the landing procedure despite an unstabilized approach characterized by inadequate situational awareness,
- Poor judgment on the part of the crew who failed to take the correct decision to initiate a go-around procedure.

Studies and research showed that the low deceleration of the aircraft and the limitation of the hydraulic pressure provided by the brake system were compatible with a slippery runway scenario. Thus, one inferred that the runway was contaminated, a condition that would reduce its coefficient of friction and impair the aircraft's braking performance, making it impossible to stop within the runway limits. On account of the mirroring condition of the runway in SSDK, it is possible that the crew had some difficulty perceiving, analyzing, choosing alternatives, and acting appropriately, given a possible inadequate judgment of the aircraft's landing performance on contaminated runways.

The following contributing factors were identified:

Attitude – a contributor.
The contribution of the pilots’ attitude to the outcome of this occurrence can be found in two distinct moments: when the go-around procedures were improvised, and when the approach was continued under marginal safety conditions, reflecting difficulties in the way the crew thought and acted.

Communication – a contributor.
One considered that the lack of clear and assertive communication between the pilots at the time of the decision to abort the takeoff, and the lack of definition as to which pilot had the aircraft controls in that moment contributed to the aircraft exceeding the departure end of the runway.

Crew Resource Management – a contributor.
The lack of adequate management of the tasks performed by the pilots during the transition to the takeoff run after the touch-down, a critical moment of the flight, combined with the lack of clear communication between them contributed to the inadequate handling of the aircraft on the ground and its consequent runway excursion.

Handling of aircraft flight controls – a contributor.
The ineffective control inputs during the final approach and during the attempt to stop the aircraft after touchdown, as well as the application of the elevator trim to the opposite side after the touchdown on the runway, indicated inadequacies in the handling of the controls that contributed to the airplane's runway excursion.

Piloting judgment – a contributor.
An inadequate assessment of the parameters related to the aircraft's operation was observed when there was an attempt to abort the takeoff after the airplane had reached 147 knots, without evaluating the remaining runway length to ensure full stop of the aircraft within the runway limits.

Flight planning – a contributor.
One concluded that the flight preparation was not adequately executed, as the planning did not allocate enough time for the pilots to prepare the aircraft for the return and carry-out of the descent procedure, resulting in an unstable approach.

One should not rule out the hypothesis of a possible malfunction of the aircraft's angle-of-attack control system, considering that the records related to the provision of the calibration service (a necessary condition for the proper functioning of the referred system, and prescribed in the aircraft's maintenance manual) were not identified in the pertinent
control documents.

The exact cause of the accident could not be determined. However, it is believed that the pilot may have encountered an unexpected situation that he was unable to manage due to his relative low experience.

The accident was the consequence of the combination of the following factors:
- Attention – undetermined.
It is likely that the pilot has experienced a lowering of his attention in relation to the available information and the stimuli of that operational context in face of the adverse conditions faced.
- Attitude – a contributor.
It was concluded that there was no reaction to the warnings of proximity to the ground (Caution Terrain) and evasive action to avoid collision (Pull Up), a fact that revealed difficulties in thinking and acting in the face of an imminent collision condition, in which the aircraft was found.
- Adverse meteorological conditions – a contributor.
The clouds height and visibility conditions did not allow the flight to be conducted, up to SBMT, under VFR rules.
- Piloting judgment – a contributor.
The attempt to continue with the visual flight, without the minimum conditions for such, revealed an inadequate assessment, by the pilot, of parameters related to the operation of the aircraft, even though he was qualified to operate it.
- Perception – a contributor
The ability to recognize and project hazards related to continuing flight under visual rules, in marginal ceiling conditions and forward visibility, was impaired, resulting in reduced pilot situational awareness, probable geographic disorientation, and the phenomenon known as " tunnel vision''.
- Decision-making process – a contributor.
The impairment of the pilot's perception in relation to the risks related to the continuation of the flight in marginal safety conditions negatively affected his ability to perceive, analyze, choose alternatives and act appropriately due to inadequate judgments and the apparent fixation on keeping the flight under visual rules, which also contributed to this occurrence.

Contributing factors.
- Control skills – a contributor
The inadequate performance of the controls led the aircraft to make a ramp that was lower than the ideal. This condition had the consequence of touching the ground before the runway’s threshold.
- Attention – undetermined
During the approach for landing, the commander divided his attention between the supervision of the copilot's activities and the performance of the aircraft's controls. Such circumstances may have impaired the flight management and limited the reaction time to correct the approach ramp.
- Attitude – undetermined
The report that the commander took two photographs of the runway and of the Aerodrome with his cell phone, during the wind leg, reflected an inadequate and complacent posture in relation to his primary tasks at that stage of the flight, which may have contributed to this occurrence.
- Communication – undetermined
As reported by the commander, the low tone and intensity of voice used by the copilot during the conduct of callouts, associated with the lack of use of the head phones, limited his ability to receive information, which may have affected his performance in management of the flight.
- Crew Resource Management – a contributor
The lack of proper use of CRM techniques, through the management of tasks on board, compromised the use of human resources available for the operation of the aircraft, to the point of preventing the adoption of an attitude (go-around procedure) that would avoid the accident, from the moment when the recommended parameters for a stabilized VFR approach are no longer present.
- Illusions – undetermined
It is possible that the width of the runway, narrower than the normal for the pilots involved in the accident, caused the illusion that the aircraft was higher than expected, for that distance from the thrashold 11 of SIRI, to the point of influence the judgment of the approach ramp. In addition, the fact that the pilot was surprised by the geography of the terrain (existence of dunes) and the coloring of the runway (asphalt and concrete), may have led to a false visual interpretation, which reflected in the evaluation of the parameters related to the approach ramp.
- Piloting judgment – a contributor
The commander's inadequate assessment of the aircraft's position in relation to the final approach ramp and landing runway contributed to the aircraft touching the ground before the thrashold.
- Perception – undetermined
It is possible that a decrease in the crew's situational awareness level resulted in a delayed perception that the approach to landing was destabilized and made it impossible to correct the flight parameters in a timely manner to avoid touching the ground before the runway.
- Flight planning – undetermined
It is possible that, during the preparation work for the flight, the pilots did not take into account the impossibility of using the perception and alarm system of proximity to the ground that equipped the aircraft, and the inexistence of a visual indicator system of approach ramp at the Aerodrome.
- Other / Physical sensory limitations – undetermined
The impairment of the hearing ability of the aircraft commander, coupled with the lack of the use of head phones, may have interfered with the internal communication of the flight cabin, in the critical phase of the flight.