A Boeing 737-800 was radar vectored by air traffic control for an ILS approach to Eindhoven Airport. The approach was flown under instrument meteorological conditions and with autopilot activated. The published approach was shortened by air traffic control, causing the aircraft to fly above the standard 3 degree glide slope area. The ILS was thus intercepted from above with help of the automated systems on board. During the glide slope intercept, the nose of the aircraft rose rapidly causing a stick shaker warning. After completion of the required stall warning recovery procedure, the crew performed a successful go-around and landed the aircraft uneventfully.
Based on this investigation a second investigation was launched to pitch up upsets due to ILS false glide slope. Details of this investigation, the report and the animation can be found here.
Watch the animation on YouTube
Identification number: LV2013079
Press
Gevaarlijke reactie automatische piloot bij vals glijpad
De Onderzoeksraad voor Veiligheid heeft een gevaarlijke reactie van de automatische piloot op het instrumentlandingssysteem (ILS) geconstateerd: vliegtuigen die op de automatische piloot landen
Investigation
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Safety Alert: Unexpected autopilot behaviour on ILS approach
On 18 November 2013 the Dutch Safety Board has issued a Safety Alert to Dutch and international aviation organisations to warn pilots, air traffic controllers and airlines for the potential dangers…
Investigation data
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Pitch-up Upsets due to ILS False Glide Slope