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False activation of a stick-shaker during take-off has spurred a US directive to check and test certain angle-of-attack sensors on Boeing 747s.
The directive, which covers a range of 747 variants including the -400, requires a general visual inspection to determine whether a specific sensor with a paddle-type vane is fitted.
For those aircraft affected the US FAA is demanding an operational test of the stall-warning system and, if necessary, replacement of the angle-of-attack sensor. The directive also covers the earliest 737 models as well as 727s.