Loss of Control In-flight (LOC-I) remains one of the most significant contributors to fatal accidents worldwide. LOC-I refers to accidents in which the flight crew was unable to maintain control of the aircraft in flight, resulting in an unrecoverable deviation from the intended flight path.

LOC-I can result from a range of interferences including engine failures, icing, or stalls. It is one of the most complex accident categories, involving numerous contributing factors that act individually or, more often, in combination. Reducing this accident category, through understanding of causes and possible intervention strategies, is an industry priority.

Environmental Factors Affecting LOC-I

Less than one tenth of accidents in the period 2011 – 2015 were categorized as LOC-I. where Environmental threats were identified in a significant proportion of all LOC-I accidents and therefore a strong link can be drawn between environmental factors and LOC-I accidents.
IATA has prepared “Environmental Factors Affecting Loss of Control In-Flight: Best Practice for Threat Recognition & Management” (pdf) guidance material to provide a point of reference for the understanding and mitigation of the risk of LOC-I as a result of the environmental factors encountered in flight.
For the purpose of this document, the environmental factors to be considered are meteorological phenomena such as connective weather and the associated conditions, turbulence in clear air turbulence from aircraft wake vortices.

LOC-I Analysis​

Download the LOC-I Accident Analysis Report (pdf) to get an evaluation of the risk factors from recent LOC-I accidents and information designed to aid industry in the implementation of mitigation strategies.

This interactive PDF report is organized in a way to provide dynamic environment data from 64 LOC-I accidents that occurred over the last 10 years, spanning from 2009 through 2018. This report contains embedded interactive Excel graphs and is written to support a user-friendly methodology to analyze and visualize LOC-I accident data and to identify patterns, trends, comparisons between data selections.
For maximum functionality, please download and save a copy of the report, before opening with Adobe Acrobat.

The embedded MsExcel graphs are available for users with Microsoft Office versions 2013, 2016 and Office 365. Please close any opened excel files after viewing in order to maintain optimum performance.

Users without Adobe Acrobat can request a MsWord copy with embedded Excel files from safety@iata.org.

LOC-I Prevention

Numerous fatalities resulted from Loss of Control In-Flight (LOC-I) accidents in recent years and the industry sees a need to take action. As an accident category, LOC-I is very broad and there are many different sequences that can lead up to an accident. This makes it difficult to produce a single, effective guidance document to help prevent LOC-I.

Analyses of LOC-I range from considerations of aircraft design to pilot training, regulatory oversight to change management. The Loss of Control Prevention: Beyond the Control of Pilots (pdf) document covers the aircraft design/manufacture characteristics as well as the organizational/managerial aspects and their role in aviation accidents.
The management section focuses on organizational and managerial issues which have the potential to create undesirable latent conditions contributory to LOC-I.
The design and manufacture section of this document concentrates on aircraft characteristics, and in particular some of the certification specificatios for transport category aircraft, which may have an influence upon LOC-I.​

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