Site preparation
98-136280-B
Chapter 3: Installation
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3.2.5
ADU mast design: Foundation and height
The ADU mast must be designed to carry the weight of the ADU unit, which is 126 kg (+
the weight of the mast flange). The mast must also be able to withstand on-board
vibrations and wind speeds up to 110 knots on the radome, even in icing conditions.
ADU mast flange
Fit the top of the ADU mast with a flange with clearance holes matching the bushings
in the radome and with minimum 4 gusset plates. No center hole is necessary in the
flange.
•
Flange thickness
: Minimum 15 mm.
•
4 gusset plates
: Minimum 15 mm thick, must be placed close to the holes in the
mounting plate and evenly distributed.
Recommended flatness on the mast mount plateau is below 3,0 mm.
Figure 3-5:
ADU
mast flange, top and side view
Figure 3-6: ADU mast flange, recommended flatness on the mast mount plateau
Gusset plates
(15 mm thick)
15 mm
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