Incident Overview

Date: Tuesday 23 May 2006
Aircraft Type: de Havilland Canada DHC-6 Twin Otter 300
Owner/operator: Air S?o Tom‚ & Principe
Registration Number: S9-BAL
Location: 3 km off S?o Tom‚ Island Airport (TMS) – ÿ S?o Tom‚ and Pr¡ncipe
Phase of Flight: En route
Status: Destroyed, written off
Casualties: Fatalities: 4 / Occupants: 4
Component Affected: Aircraft Control System (specifically, the turn and altitude control systems)Aircraft Control System (specifically, the turn and altitude control systems)
Investigating Agency: CNIPAIACNIPAIA
Category: Accident
A Twin Otter aircraft experienced a catastrophic crash during a training flight off the Ba¡a Ana Chaves. The aircraft began a rapid, excessively tight turn into a left downwind leg of the approach, resulting in a sudden and severe impact with the sea.A Twin Otter aircraft experienced a catastrophic crash during a training flight off the Ba¡a Ana Chaves. The aircraft began a rapid, excessively tight turn into a left downwind leg of the approach, resulting in a sudden and severe impact with the sea.

Description

The Twin Otter crashed into the Ba¡a Ana Chaves, two miles offshore during a training flight. Having departed from runway 11 at S?o Tom‚ Airport at 18:22 UTC, the first two touch-and-goes were carried out normally. The third manoeuvre began at 18:37 and during the climb phase, the aircraft unexpectedly began an excessively tight turn into the left downwind leg of the approach and at an altitude of approximately 600 feet it crashed into the sea. CONCLUSION The Commission of Inquiry has concluded that the causes that contributed to the accident are as follows: – Excessively tight turn and low altitude for the tailwind – Late realisation by the crew of the abnormally serious attitude that would be experienced by the aircraft – Late reaction by the crew to a situation that was already complicated

Primary Cause

Excessively tight turn and low altitude for the tailwind, late realisation by the crew of the abnormally serious attitude that would be experienced by the aircraft, and late reaction by the crew to a situation that was already complicated.Excessively tight turn and low altitude for the tailwind, late realisation by the crew of the abnormally serious attitude that would be experienced by the aircraft, and late reaction by the crew to a situation that was already complicated.

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