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 MIL-HDBK-419A
PART II - LIGHTNING PROTECTION SUBSYSTEM
Cone of Protection:
A.
Initial
Condition
No change from previous inspection.
(All facility components and antennas are within
1:1 cone of protection.)
Additions made but within 1:1 cone of protection
(update drawings to show locations of additions).
Lightning protection subsystem needs expanding to
include new additions.
B.
Inspection Checklist:
1.
Check for evidence of burning, pitting, as well as
melting of air terminals.
2.
Check for burned or melted down conductors
and fasteners.
3.
Cheek for broken or severely damaged as well as
distorted roof conductors, down conductors,
and bonding jumpers.
Look for signs of arcing or flashover indicating
4.
5.
Cheek for corroded or loose connectors and
fasteners.
6.
Make sure that copper-to-aluminum contact
does not occur except through UL-approved
bimetallic connectors.
7.
Make sure that all guards for down conductors
are in place and without severe mechanical damage.
8.
Make sure that all guards are bonded to down
conductors (at both ends of guard).
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