SF34, en-route, north of Edinburgh UK, 2017

SF34, en-route, north of Edinburgh UK, 2017

Summary

On 5 June 2017, a Saab 340B encountered an unexpected short period of severe in-cloud turbulence and icing soon after climbing through FL 100 on departure from Edinburgh and a temporary but constrained loss of pitch control occurred during which three successive Angle of Attack-triggered stick shaker activations occurred before the severity of the turbulence reduced and the intended climb could be resumed. The Investigation found that the crew had not responded to the problem in accordance with prescribed procedures and that at no time during the episode had they set Maximum Continuous Power to aid prompt and effective recovery.

Description

On 5 June 2017, a Saab 340B (G-LNGB) being operated by Loganair on a scheduled domestic passenger flight from Edinburgh to Sumburgh was climbing in day IMC when it unexpectedly encountered severe icing and turbulence and temporary loss of pitch control which was accompanied by a succession of stick shaker activations before the crew regained control as the turbulence lessened. The flight thereafter was uneventful.

Investigation

A Field Investigation was carried out by the UK AAIB. Relevant recorded data was available from the FDR but that on the CVR had been overwritten. It was noted that the 34 year-old Captain had 6,638 total flying hours of which all but 251 hours were on type. The experience of the First Officer, who had only “very recently” completed his conversion to type, was not documented.

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