Attachment 12
A12.5.3. Installation:
A12.5.3.1. Rigid Pavement Tiedowns. Where the tiedowns are to be constructed in rigid pavement,
the rods may be installed without bottom anchors. Tiedowns should be a minimum of 600 millimeters
[2 feet] from any pavement edge or joint.
A12.5.3.2. Flexible Pavements Tiedowns. Where flexible pavement is to be constructed on frost
susceptible soil, the rods will be equipped with a screw-type bottom end having a wing diameter of not
less than 150 millimeters [6 inches] as shown in Figure A12.12 The rod will be threaded to permit
attachment to the bottom anchor.
A12.5.3.3. Pavement Recess Design. The top of the tiedown will be set at pavement grade or not more
than 6 millimeters [0.25 inches] below grade. A smooth rounded edge recess 75 millimeters [3 inches]
wide and not more than 150 millimeters [6 inches] long will be provided in the pavement around the
eye for accessibility and attachment of grounding cables. This is shown in Figure A12.12.
A12.5.4. Grounding Requirements. The maximum resistance of new tiedowns, measured in accordance
with ANSI/IEEE Standard 142, should not exceed 10,000 ohms under normal dry conditions. If this
resistance cannot be achieved, an alternative grounding system should be considered.
A12.6. Tiedown Mooring Eyes for Navy and Marine Corps. Requirements, layout, and installation details
for Navy and Marine Corps tiedown mooring eyes are found in MIL-HDBK-1021/4, Rigid Pavement Design
for Airfields. Requirements, layout, and installation details for Navy and Marine Corps grounding
arrangements are found in MIL-HDBK 274, Electrical Grounding for Aircraft Safety.
A12-18
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