Crash-aerien 20 MAR 2017 d'un ATR 42-500 PR-TTH - Coari-Urucu Airport, AM
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Statuts:Accident investigation report completed and information captured
Date:lundi 20 mars 2017
Heure:22:45
Type/Sous-type:Silhouette image of generic AT45 model; specific model in this crash may look slightly different
ATR 42-500
Compagnie:TOTAL Linhas Aéreas
Immatriculation: PR-TTH
Numéro de série: 506
Année de Fabrication: 1996
Heures de vol:31686
Cycles:33979
Moteurs: 2 Pratt & Whitney Canada PW127E
Equipage:victimes: 0 / à bord: 4
Passagers:victimes: 0 / à bord: 0
Total:victimes: 0 / à bord: 4
Dégats de l'appareil: Substantiels
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Coari-Urucu Airport, AM (   Brésil)
Phase de vol: A l'atterrissage (LDG)
Nature:Convoyage
Aéroport de départ:Manaus-Eduardo Gomes International Airport, AM (MAO/SBEG), Brésil
Aéroport de destination:Coari-Urucu Airport, AM (SWUY), Brésil
Détails:
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


Opérations de secours

CENIPA issued 1 Safety Recommendation

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Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Manaus-Eduardo Gomes International Airport, AM et Coari-Urucu Airport, AM est de 620 km (388 miles).
Accident location: Approximate; accuracy within a few kilometers.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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