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Accident
Last updated: 14 December 2017
Status:Schlussbericht
Datum:Dienstag 4 Juni 2002
Zeit:12:38
Flugzeugtyp:Silhouette image of generic MD82 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-82 (MD-82)
Fluggesellschaft:Spirit Airlines
Kennzeichen: N823NK
Werknummer: 48020/1045
Baujahr:
Betriebsstunden:53116
Triebwerk: 2 Pratt & Whitney JT8D-219
Besatzung:Todesopfer: 0 / Insassen: 6
Fluggäste:Todesopfer: 0 / Insassen: 105
Gesamt:Todesopfer: 0 / Insassen: 111
Sachschaden: schwer beschädigt
Konsequenzen: Repaired
Unfallort:37 km (23.1 Meilen) W of Wichita, KS (   USA)
Flugphase: Während des Fluges (ENR)
Betriebsart:Inländischer planmäßiger Passagierflug
Flug von:Denver International Airport, CO (DEN/KDEN), USA
Flug nach:Fort Lauderdale International Airport, FL (FLL/KFLL), USA
Flugnummer: 970
Unfallbericht:
Flight 970 experienced a gradual loss of power in both of its engines while in cruise flight at flight level 330. The aural stall warning and stick shaker activated, following which the pilots disengaged the autopilot, turned on the engines’ ignition, activated the engines’ anti-ice system, and initiated a descent towards Wichita. The pilots shut down the right engine when its exhaust gas temperature (EGT) increased to about 600 ° Celsius and were able to restart it again on the second attempt at about 17,000 feet. The left engine recovered on its own shortly thereafter. The flight then diverted to the Wichita Mid-Continent Airport where it landed safely.

Probable Cause:

PROBABLE CAUSE: "The flightcrew's failure to verify the engine instrument indications and powerplant controls while on autopilot with the autothrottles engaged, and their failure to recognize the drop in airspeed which led to an aerodynamic stall associated with the reduction in engine power. Factors were the presence of ice crystals at altitude, and the icing of the engine inlet probes resulting in a false engine pressure ratio indication."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 8 months
Accident number: CHI02IA151
Download report: Summary report

Informationsquelle:
» NTSB


Sicherheitsempfehlungen
On April 29, 2004, the NTSB recommended that the FAA:

Issue a flight standards information bulletin to principal operations inspectors to alert all affected air carrier flight crews about the icing situation encountered by Spirit Airlines flight 970 and to emphasize the need to maintain vigilance for the signs of high altitude icing conditions, the effect these conditions can have on airplane and engine performance, and the need for the appropriate use of the engine anti-ice system. (A-04-34)



Actively pursue research with airplane and engine
manufacturers and other industry personnel to develop an ice detector that would alert pilots of inlet pressure probe icing and require that it be installed on new production turbojet airplanes, as well as retrofitted to existing turbojet airplanes. (A-04-35)

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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 Denver International Airport, CO to Fort Lauderdale International Airport, FL as the crow flies is 2720 km (1700 miles).

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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