FIELD: transportation.
SUBSTANCE: flap (10) consists of two parts (11, 12) hingedly connected by a substantially airtight hinge (30). The first part basically comprises a curvilinear edge corresponding to the concavity of the transverse beam (1). The hinge comprises means (40) for locking in various positions of the second part (12) with respect to the first part (11), including at least that in one unfolded position, essentially in the extension of the first part and in the tilted position substantially perpendicular to the unfolded position.
EFFECT: improving the lateral tightness with respect to air in the air duct area at the level of the flaps of the transverse beam.
10 cl, 8 dwg
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