Attachment 12
TIEDOWNS, MOORING, AND GROUNDING POINTS
A12.1. Types of Equipment:
A12.1.1. Mooring and Grounding Point. A mooring and grounding point is a mooring casting with a
grounding rod attached. Aircraft mooring and grounding points are used to secure parked aircraft and
also serve as electrodes for grounding connectors for aircraft. Combined mooring and grounding
points have previously been used by the Army, but are not currently used as they do not meet mooring
and grounding design loads required by TM 1-1500-250-23, General Tie-Down and Mooring on all
Series Army Models AH-64, UH-60, CH-47, UH-1, AH-1, OH-58 Helicopters.
A12.1.2. Mooring Point. A mooring point is a mooring casting without a grounding rod attached, used
to secure parked aircraft. Mooring points are used by the Army.
A12.1.3. Static Grounding Point. A static grounding point is a ground rod attached to a casting. The
casting protects the ground rod but does not provide mooring capability. Static grounding points are
used by the Army in aprons and hangars.
A12.1.4. Tiedown. A tiedown is a 3-meter [10-foot] rod with a closed-eye bend. The tiedown is
intended to secure parked aircraft but may also serve as an electrode connection for static grounding of
aircraft. Tiedowns are used by the Air Force.
A12.1.5. Tiedown Mooring Eye. A tiedown mooring eye is a mooring casting with a grounding rod
attached. They are similar to the mooring and grounding point discussed above. Tiedown mooring
eyes are used by the Navy and Marine Corps.
A12.2. Mooring Points for Army Fixed- and Rotary-Wing Aircraft:
A12.2.1. Type. A mooring point consists of a ductile iron casting, as shown in Figure A12.1. The
mooring casting is an oval-shaped casting with a cross-rod to which mooring hooks are attached.
A12.2.2.. Design Load. Unless specifically waived in writing by the facility Commander, all new
construction of Army aircraft parking aprons will include aircraft mooring points designed for a 67,800
Newton [15,250 pound] load, as specified in TM 1-1500-250-23 and applied at 19.15 degrees (19.15)
from the pavement surface, as illustrated in Figure A12.2.
A12.2.3. Layout:
A12.2.3.1. Fixed-Wing Aprons. Mooring points should be located as recommended by the aircraft
manufacturer or as required by the base.
A12.2.3.2. Rotary-Wing Aprons:
A12.2.3.2.1. Number of Moored Parking Spaces. Moored parking spaces will be provided for
100 percent of the authorized aircraft. The combined total of apron parking space and hangar
parking space should provide sufficient parking for wind protection for all facilities' authorized
aircraft and typical transient aircraft. Additional parking spaces with mooring points may be
added as necessary to ensure wind protection for all aircraft. The locations of these additional
mooring points can be on pavements other than parking aprons. Prepared turf surfaced areas
are acceptable for rotary-wing aircraft mooring locations.
A12-1
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