Grahame Hutchison
27th November 2013, 07:54 AM
Interesting problem after so many years of service ...
http://www.flightglobal.com/news/articles/norwegian-near-stall-to-spur-737-modification-393527/
Boeing is to modify 737s to improve protection against potential freezing of elevator systems, after investigation into a near-stall by a Norwegian aircraft highlighted the risk of de-icing fluid contaminating power control units for the horizontal stabiliser.
The investigation into the 737-800 incident, on approach to Kittila in Finland, has already resulted in Boeing changing de-icing procedures on the type. Under the new procedures the trim is set to take-off position, rather than fully-forward, and de-icing fluid is applied at an angle, not directly from the side.
http://www.flightglobal.com/news/articles/norwegian-near-stall-to-spur-737-modification-393527/
Boeing is to modify 737s to improve protection against potential freezing of elevator systems, after investigation into a near-stall by a Norwegian aircraft highlighted the risk of de-icing fluid contaminating power control units for the horizontal stabiliser.
The investigation into the 737-800 incident, on approach to Kittila in Finland, has already resulted in Boeing changing de-icing procedures on the type. Under the new procedures the trim is set to take-off position, rather than fully-forward, and de-icing fluid is applied at an angle, not directly from the side.