CL60, en-route, southwest of Shahr-e-Kord Iran, 2018

CL60, en-route, southwest of Shahr-e-Kord Iran, 2018

Summary

On 11 March 2018 an Unreliable Speed Alert occurred on a Bombardier Challenger, the Captain’s airspeed increasing whilst the First Officer’s decreased. The First Officer attempted to commence the corresponding drill but the Captain’s interruptions prevented this and a (false) overspeed warning followed. The Captain’s response to both alerts was to reduce thrust which led to a Stall Warning followed, after no response, by stick pusher activation which was repeatedly opposed by the Captain despite calls to stop from the First Officer. The stalled condition continued for almost five minutes until a 30,000 feet descent was terminated by terrain impact.

Description

On 11 March 2018 a Bombardier 604 Challenger (TC-TRB) being operated by MC Aviation on a private passenger flight from Sharjah to Istanbul Ataturk experienced an indicated airspeed discrepancy whilst adjusting the cruise level from FL360 to FL 380 in day IMC following which control was lost as a series of stall warnings was followed by the flameout of both engines. Recovery was not attempted and impact with mountainous terrain followed soon afterwards. The aircraft was destroyed by impact forces and a post crash fire and the three crew and eight passengers on board were killed.

Investigation

An Investigation was carried out by the Aircraft Accident Investigation Board (AAIB) of the Iran Civil Aviation Organisation (CAO). The FDR and hour CVR were eventually located and recovered from the accident site and their data successfully downloaded. No crew speech was recorded on the dedicated channels (considered to be due to no use of headsets) so the area microphone data were filtered to obtain a record of communications between the two pilots.

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