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Last updated: 17 April 2021
Estado:Final
Fecha:viernes 4 febrero 2011
Hora:17:49
Tipo:Silhouette image of generic H25B model; specific model in this crash may look slightly different
Raytheon Hawker 850XP
Operador:Sky Lounge Services
Registración: OD-SKY
Numéro de série: 258804
Año de Construcción: 2006
Motores: 2 Garrett TFE731-5BR-1C
Tripulación:Fatalidades: 3 / Ocupantes: 3
Pasajeros:Fatalidades: 4 / Ocupantes: 4
Total:Fatalidades: 7 / Ocupantes: 7
Daños en la Aeronave: Destruido
Consecuencias: Written off (damaged beyond repair)
Ubicación:Sulaymaniyah International Airport (ISU) (   Irak)
Elevación del lugar del accidente: 753 m (2470 feet) amsl
Fase: Ascenso Inicial (ICL)
Naturaleza:Ejecutivo
Aeropuerto de Salida:Sulaymaniyah International Airport (ISU/ORSU), Irak
Aeropuerto de Llegada:Ankara-Esenboga Airport (ESB/LTAC), Turquía
Descripción:
A Hawker 850XP corporate jet was destroyed in an accident at Sulaymaniyah, Iraq. All seven on board were killed. Among the passengers were technicians and shareholders with Iraqi mobile phone company Asiacell.
An investigation showed that the airplane stalled before reaching sufficient speed, and descended, striking the ground almost 6900 feet from the runway 31 threshold, and 130 feet from the right-hand edge.
Prior to departure the crew did not remove accumulated snow on the upper surface of the wing.

Probable Cause:

Probable Cause
1- The flight crew’s failure to de-ice the aircraft prior to take-off resulted in the aircraft wings top surface, especially the right wing, being contaminated with ice and snow, leading the right wing to stall at a speed significantly below the clean wing stall speed.
a. There was a contaminated ice and snow on the wings, elevator and horizontal stabilizer top surface.
b. The pilot was in a hurry and didn’t remove these contaminations.
Contributing Factors
1- The hurry up syndrome led the captain to disregard de-icing the aircraft, despite the physical evidence and confirmation of ice contamination by the F/O, as he was focusing his attention on the deteriorating visibility.
2- The F/O lack of assertiveness in insisting on de-icing the aircraft prior to take-off did not help the captain review his decision.
3- The Contamination of snow and ice on top of the wing, fuselage and tail will compromise the normal takeoff characteristics.
4- The stall warning did not activate as the wing stalling speed and AOA was well below the clean wing stalling speed.

ASN editorial note:
The Iraqi CAA final report writes that the speed "was well below the clean wing stalling speed." Given the context, the speed was likely *above* the clean wing stalling speed.

Accident investigation:
cover
Investigating agency: CAA Iraq
Status: Investigation completed
Duration: 1 year and 8 months
Accident number: Investigation Report no. 12/36/105
Download report: Final report

Fuentes:
» Canadian Press
» Iraqi CAA Aircraft Accident Report No. 12/36/105

METAR Weather report:
14:00 UTC / 17:00 local time:
ORSU 041400Z 15006KT 1500 SN OVC035 03/00 Q1022=
Wind: 150 degrees at 6 knots; 1500 m visibility in snow; overcast 3,500 ft; Temperature 3°C; Dewpoint 0°C


Subsiguiente / acciones de seguridad

CAA Iraq issued 8 Safety Recommendations

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Fotos

photo of Raytheon-Hawker-850XP-OE-GRS
accident date: 04-02-2011
type: Raytheon Hawker 850XP
registration: OE-GRS
 

Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Sulaymaniyah International Airport to Ankara-Esenboga Airport as the crow flies is 1186 km (741 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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