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Last updated: 17 April 2021
Statuts:Enquête Officielle
Date:vendredi 4 février 2011
Type/Sous-type:Silhouette image of generic H25B model; specific model in this crash may look slightly different
Raytheon Hawker 850XP
Compagnie:Sky Lounge Services
Immatriculation: OD-SKY
Numéro de série: 258804
Année de Fabrication: 2006
Moteurs: 2 Garrett TFE731-5BR-1C
Equipage:victimes: 3 / à bord: 3
Passagers:victimes: 4 / à bord: 4
Total:victimes: 7 / à bord: 7
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Sulaymaniyah International Airport (ISU) (   Irak)
Élévation des lieux de l'accident: 753 m (2470 feet) amsl
Phase de vol: En montée initiale (ICL)
Aéroport de départ:Sulaymaniyah International Airport (ISU/ORSU), Irak
Aéroport de destination:Ankara-Esenboga Airport (ESB/LTAC), Turquie
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:
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

» 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

Opérations de secours

CAA Iraq issued 8 Safety Recommendations

Show all...


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

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 Sulaymaniyah International Airport et Ankara-Esenboga Airport est de 1186 km (741 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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