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http://dx.doi.org/10.12673/jant.2021.25.3.248

Trend Analyses of B777 FLCH Usage Beyond FAF Events  

Chung, Seung Sup (Department of Aeronautical Science & Flight Operations, Korea Aerospace University)
Kim, Hyeon Deok (Department of Aeronautical Science & Flight Operations, Korea Aerospace University)
Publication Information
Journal of Advanced Navigation Technology / v.25, no.3, 2021 , pp. 248-255 More about this Journal
Abstract
The main causes of the July 2013 OZ 214 accident were poorly performed approach and the failure to recognize the autothrottle in the HOLD position which the automated speed control was not provided. The pilots late decision for go-around was also a critical factor leading to the accident. The B777 POM restricts the use of FLCH mode beyond the FAF. This research utilized the QAR data of an airline's B777 fleet in the period of two years where 44 cases were found. In many cases, the FLCH mode was used for rapid descent from an higher than normal situation. In addition, in the base turn, continuous use of FLCH mode even when the path was below the glide path were observed. Airports with elevation above 500 ft MSL had a higher rate of occurrence. In this research, the proper descent planning and vertical path monitoring, and the adherence to the limitation set in the manuals and the stabilized approach criteria were re-emphasized as mitigation to reduce event occurences.
Keywords
A/T hold mode; Base turn; FLCH after FAF; Track mile; Vertical path management;
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