Loss of control Accident de Havilland Canada DHC-6 Twin Otter 300 S9-BAL, Tuesday 23 May 2006
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Date:Tuesday 23 May 2006
Type:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different    
de Havilland Canada DHC-6 Twin Otter 300
Owner/operator:Air São Tomé & Principe
Registration: S9-BAL
MSN: 648
Year of manufacture:1979
Engine model:Pratt & Whitney Canada PT6A-27
Fatalities:Fatalities: 4 / Occupants: 4
Other fatalities:0
Aircraft damage: Destroyed, written off
Location:3 km off São Tomé Island Airport (TMS) -   São Tomé and Príncipe
Phase: En route
Departure airport:São Tomé Island Airport (TMS/FPST)
Destination airport:São Tomé Island Airport (TMS/FPST)
Investigating agency: CNIPAIA
Confidence Rating: Accident investigation report completed and information captured
The Twin Otter crashed into the Baía Ana Chaves, two miles offshore during a training flight.

Having departed from runway 11 at São Tomé 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.

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

Accident investigation:
Investigating agency: CNIPAIA
Report number: 
Status: Investigation completed
Download report: Final report


Único avião da Air São Tomé despenhou-se no mar (Jornal de São Tomé e Príncipe, 24-5-2006)



photo (c) Mauro Cerizzi; Principe Airport (PCP/FPPR); January 2003

Revision history:

06-Jul-2024 07:08 ASN Updated [Time, Narrative, Accident report]
06-Jul-2024 07:09 ASN Updated

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