Vliegtuigongeval op 20 MAR 2017 met ATR 42-500 PR-TTH - Coari-Urucu Airport, AM
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Status:Accident investigation report completed and information captured
Datum:maandag 20 maart 2017
Type:Silhouette image of generic AT45 model; specific model in this crash may look slightly different
ATR 42-500
Luchtvaartmaatschappij:TOTAL Linhas Aéreas
Registratie: PR-TTH
Constructienummer: 506
Bouwjaar: 1996
Aantal vlieguren:31686
Aantal vluchten:33979
Motoren: 2 Pratt & Whitney Canada PW127E
Bemanning:slachtoffers: 0 / inzittenden: 4
Passagiers:slachtoffers: 0 / inzittenden: 0
Totaal:slachtoffers: 0 / inzittenden: 4
Schade: Groot
Gevolgen: Written off (damaged beyond repair)
Plaats:Coari-Urucu Airport, AM (   Brazilië)
Fase: Landing (LDG)
Soort vlucht:Ferry
Vliegveld van vertrek:Manaus-Eduardo Gomes International Airport, AM (MAO/SBEG), Brazilië
Vliegveld van aankomst:Coari-Urucu Airport, AM (SWUY), Brazilië
The ATR 42-500 veered off runway 09 during landing at Coari-Urucu Airport, AM, Brazil. There were no injuries, but the aircraft sustained substantial damage.
After approximately one hour and ten minutes of flight time, during the descent procedure, the no.2 propeller rpm suddenly increased. The crewmembers performed the procedures set out in the aircraft manuals and proceeded to their destination.
The crew carried out an NDB approach to runway 09 at Coari-Urucu Airport in light rain conditions.

After touchdown the right propeller did not assume the reverse pitch with the throttle in position below Ground Idle. The aircraft then yawed to the left and veered off the runway approximately 500 m after the touchdown point, traveling about 180 m through the grass.

Probable Cause:

Contributing factors.
- Attention – a contributor.
The lack of attention to the lighting of the Low Pitch lights contributed to the application of reverse in both engines, with only one of the lights on.
Thus, this action contributed to the asymmetric reverse condition, which allowed the aircraft to exit the runway on the left.
- Emotional state – undetermined.
The feeling of apprehension experienced by the crewmembers in relation to the length of the runway, associated with the condition of night operation and in the rain, may have affected their performance, so that, in an attempt to anticipate the engines entering the reverse regime, the standard landing procedures were not properly performed.
- Aircraft maintenance – undetermined.
The series of discrepancies identified in the Microswitch Box, PN 11S76180650-10, SN 0199, indicating that the unit could have been opened in an unauthorized location, raised doubts about the quality standard of the services performed on the aircraft, which may have allowed an aircraft grounding condition fault that has affected several aircraft electrical components and caused the Np Cancel function to fail.

Accident investigation:

Investigating agency: CENIPA
Status: Investigation completed
Duration: 5 years and 7 months
Accident number: A-053/CENIPA/2017
Download report: Final report


CENIPA issued 1 Safety Recommendation

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Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Manaus-Eduardo Gomes International Airport, AM en Coari-Urucu Airport, AM bedraagt 620 km (388 miles).
Accident location: Approximate; accuracy within a few kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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