AT45, en-route, north of Islamabad Pakistan, 2016

AT45, en-route, north of Islamabad Pakistan, 2016

Summary

On 7 December 2016, the crew of an ATR 42-500 lost control after airworthiness-related complications followed shutdown of the left engine whilst in the cruise and high speed terrain impact followed. The Investigation concluded that three pre-existing faults with the left engine and its propeller control mechanism had led to a loss of power which had necessitated its shutdown but that these faults had then caused much higher left side drag than would normally result from an engine shutdown and made it progressively more difficult to maintain control. Recovery from a first loss of control was followed by another without recovery.

Description

On 7 December 2016, an ATR42-500 (AP-BHO) being operated by Pakistan International Airlines on a scheduled domestic passenger flight from Chitral to Islamabad crashed en-route in day VMC after the crew were unable to retain control when their attempt to shut down the malfunctioning left engine was complicated by unrelated faults which then prevented the normal operation of the propeller feathering mechanism. The aircraft was destroyed by impact forces and an intense post-impact fire and all 47 persons on board were killed.

Investigation

An Investigation was carried out by the Pakistan Accident Investigation Board in accordance with ICAO Annex 13 principles. The DFDR and the CVR were recovered from the wreckage and the data from both were successfully downloaded.

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