MIL-HDBK-274A
5.9.1.1.3 Ground path terminations. In accordance with NAVSEA OP4 Ninth Revision, "Ground paths should never be terminated at:
a. Electrical conduits or wiring coverings;
b. Gas, air or steam pipes or tubing;
c. Sprinkling systems, including dry sprinkling systems;
d. Electrical source neutral points;
e. Hydraulic, fuel or lubricating lines;
f. Electronic transmitter cables, waveguides or ground leads; or g. Internal communication signal system conduits."
5.9.1.1.4 Ordnance handling. Due to the inherent hazards in handling ordnance, all personnel should be aware of the unique characteristics of individual weapons by reviewing the technical manual and the Conventional Weapons Checklist for that weapon. Familiarization with the contents of NAVSEA OP 4, Ninth Revision, Chapter 7 is advised.
5.9.2 Temporary grounding. In areas where no static or power grounds exist, metal rods may be driven into the ground at points adjacent to the proposed aircraft parking position. For temporary grounds that may be used for some period of time, these rods should be approximately
2.43 meters (8 feet) long and 22.2 mm (0.875 inches) in diameter. Care should be taken that the rod is not driven into a place where it will damage underground services.
5.9.2.1 Temporary field grounding. For aircraft operating in the field, a temporary
ground may be obtained by driving a metal rod a minimum of one meter (3.28 feet) in length and
12.7 mm (0.5 inch) in diameter into the ground adjacent to the parked aircraft. This usually provides an acceptable static ground. The quality of the ground depends on the type of soil and the amount of moisture available. The ground resistance can be improved by saturating the area with water. Note that at below freezing temperatures, soil resistivity increases significantly, and this effect can be minimized by burying the ground electrode below the frost line.
5.9.2.2 Temporary ground rod. A temporary ground rod that is in use for some time should have its ground resistance measured on a frequent basis. The resistance should be less than 10,000 ohms. If it is not, consideration should be given to driving additional or longer rods in order to reduce ground resistance.
5.9.2.3 Grounds in deep ice areas. In geographical areas covered by deep ice, such as
Antarctica, a temporary ground can be established as follows:
a. Drive a metal rod approximately one meter (3.28 feet) long and 12.7 mm (0.5 inch) in diameter into the ice.
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