AMC VLA 443 Gust loads (Interpretative Material and
Acceptable Means of Compliance)
ED Decision 2003/18/RM
1 For aeroplanes where the horizontal tail is supported by the vertical tail, the tail surfaces and their supporting structure including the rear portion of the fuselage should be designed to withstand the prescribed loadings on the vertical tail and the roll-moments induced by the horizontal tail acting in the same direction.
2 For T-tails in the absence of a more rational analysis, the rolling moment induced by gust load may be computed as follows:
where –
Mr = induced roll-moment at horizontal tail (Nm)
K = gust factor = 1·2
bH = span of horizontal tail (m)
St = area of horizontal tail (m2)
ρο = density of air at sea level (kg/m3)
V = speed of flight (m/s)
U = gust speed (m/s)