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 MIL-HDBK-419A
c.
Keep all hardware, component parts, and joints that are not welded or brazed and that require
inspection for maintenance and repair readily accessible.
d.
Any special fixtures required for access should be permanently attached to prevent loss. However,
appropriate locks or other devices essential to safety, security, and physical protection of the hardware or of
the area in which it is located may be used.
1.3.3 Separately Mounted Protection Systems.
1.3.3.1 Mast Type.
a.
No part of the structure being protected should extend outside the protected zone as calculated by
the procedure illustrated by Figure 1-19 (a conservative estimate for two masts can be made with the aid of
Figure 1-24).
b.
Where it is impractical to provide a common mast to provide protection for an entire structure,
additional masts should be provided.
If the pole is made of a nonconducting material, provide an air terminal extending not less than 0.6
c.
meters (2 feet) nor more than 0.9 meters (3 feet) above the top of the pole.
d.
Connect the base of the mast (if metal) or the down conductors to the earth electrode subsystem of
the protected structure with at least a No. 6 AWG copper conductor or equivalent.
Figure 1-24. The Protected gone Provided by Two Vertical Masts
1-40
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