Site preparation
98-137654-A
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.
3.2.5.1 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
Gusset plates
(15 mm thick)
15 mm
Figure 3-6: ADU mast flange, recommended flatness on the mast mount plateau
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