2011 Moremi Air Cessna 208 crash

On 14 October 2011, a Cessna 208 Caravan turboprop passenger aircraft operated by Moremi Air on a domestic flight from Xakanaka camp to Maun, Botswana, crashed and caught fire shortly after take-off, killing eight of the twelve people on board.[1]

2011 Moremi Air Cessna 208 crash

A Cessna 208 Caravan similar to the one involved
Accident
Date	14 October 2011 (2011-10-14)
Summary	Engine failure on take-off
Site	Near Xakanaka camp, Botswana 19.200°S 23.427°E / -19.200; 23.427
Aircraft
Aircraft type	Cessna 208B Grand Caravan
Operator	Moremi Air Services
Registration	A2-AKD
Flight origin	Maun Airport, Maun, Botswana
1st stopover	Xakanaka camp, Botswana
2nd stopover	Pom Pom camp, Botswana
Destination	Maun Airport
Occupants	12
Passengers	11
Crew	1
Fatalities	8
Injuries	4
Survivors	4

The following investigation concluded that the aircraft suffered a catastrophic engine failure on take-off, compounded by environmental hazards at Xakanaka, which led to the plane hitting trees and crashing to the ground.[2]

History of the flight

The aircraft had departed from Maun Airport on the morning of 14 October for a series of flight sectors in the Okavango Delta that took it first to Kasane Airport. After refuelling there, at 11:50 eleven passengers boarded the aircraft. The next sector would have taken the Cessna to Pom Pom Camp, but it was decided to stop at Xakanaxa first to drop two passengers. No flight plan was filed for the diversion to Xakanaxa, nor was the airline's base informed.[2]

At Xakanaxa, the pilot was informed that he was required to pick up another two passengers bound for Maun. After some hesitation, the pilot agreed to take the passengers, departing from Xakanaxa with eleven passengers, despite company procedures restricting the maximum number of passengers for operations from that airfield to ten.[2]

The Grand Caravan took off from Xakanaka airstrip at 13:55. Almost immediately after take-off, the engine lost power and the aircraft collided with trees. It then crashed nose first approximately 600 metres from the airfield, with an intense fire quickly engulfing the wreckage, burning beyond recognition the bodies of six passengers and the pilot. A rescue team was flown in and found the wreckage still ablaze. An eighth occupant was taken to hospital but later died. Identification of the victims was only possible through DNA testing.[2][3]

Aircraft

The airplane involved was a Cessna 208B Grand Caravan, a single-engine turboprop utility aircraft capable of carrying thirteen passengers plus crew. It was fitted with a Pratt & Whitney Canada PT6A-114A turboprop engine. It held Botswanan registration A2-AKD, and had been manufactured in 1996.[4]

Passengers and crew

The Grand Caravan was crewed by a single pilot and was carrying eleven passengers. The passengers were mainly French and Swiss tourists heading for a safari lodge, but included also two Botswanan officials from the country's Department of Road Transport, who both survived. Some of the Swiss passengers were initially misidentified as Swedish.[5] The pilot was Moremi Air’s general manager, and was described as the company's "most seasoned pilot" with over 12,000 flight hours.[6]

Nationality	Passengers	Crew	Fatalities
France	4	0	2
United Kingdom	1	1	2
Switzerland	4	0	4
Botswana	2	0	0
Total	11	1	8

Investigation

The investigation into the crash was carried out by the Directorate of Accident Investigation (DAI) of the Botswanan Ministry of Transport and Communications. Its results were published in June 2013.[7][2]

The main cause of the accident was found to be "engine failure resulting from the failure of the Compressor Turbine Blades."[note 1] Turbine blades were found to be affected by "sulphidation corrosion", although it could not be established whether that was the root cause of the failure, leaving open the possibility that material failure or inappropriate engine operation may have played a role.[2]

The report was also very critical of Moremi Air's management style and training practices, concluding that the company's safety culture "had eroded to the extent that safety was being compromised." Other contributing factors cited were the presence of tall trees in the vicinity of the runway at Xakanaxa, the decision to embark more passengers than the maximum allowed for operations at that airfield, poor supervision of operators and airfields by the Civil Aviation Authority of Botswana (CAAB), and the engine manufacturer's failure to disseminate "critical maintenance information" among operators.[2]

The DAI made several safety recommendations to the CAAB calling for stricter supervision of airline and airfield operators, and to Cessna, the aircraft manufacturer, to ensure that the aircraft data acquisition system (ADAS) is made to resist to fire damage.[2]

Notes

1. In a free-turbine engine such as the PT6A, the compressor turbine is the turbine that drives the compressor, as opposed to the power turbine, which is separate and drives the propeller.

References

1. "Botswana air crash kills European tourists". BBC News. 17 October 2011. Archived from the original on 7 January 2012. Retrieved 2 April 2019.
2. "Moremi Air Partly Blamed For Crash". The Ngami Times (655). 21 June 2013. Archived from the original on 22 June 2013.
3. Keakabetse, Boniface. "Seven tourists die in plane crash". The Monitor. Archived from the original on 23 April 2012. Retrieved 20 July 2012.
4. "Accident Description". Aviation Safety Network. 14 October 2011. Archived from the original on 2 July 2012. Retrieved 26 November 2011.
5. "'No Swede died in plane crash'". The Monitor. 19 October 2011.
6. Laing, Aislinn. "British pilot who died in Botswana air crash named". The Telegraph. Archived from the original on 25 September 2015. Retrieved 20 July 2012.
7. "AIRCRAFT ACCIDENT A2 AKD in the Delta" . Civil Aviation Authority of Botswana. 19 October 2011. Archived February 22, 2014, at the Wayback Machine