However, vehicles with cleats, studs, or other gripping devices and treads that allow concentrated contact require rolling shoring. The majority of vehicles shipped by air, such as those with pneumatic tires, do not exceed weight limitations and do not require rolling shoring. This type of shoring is used to protect surfaces from damage when moving a vehicle across it ( Figure 6-3). Use rolling shoring to protect airport parking ramps and the loading ramps and cargo floor of the aircraft from damage. All other nonspecific types of shoring are considered special shoring. They are rolling shoring, parking shoring, and sleeper shoring. There are three main types of shoring which are named for the way they are used to protect the aircraft cargo floor. The relation between the width of the border and the thickness of the shoring applies to all shoring. Generally, using shoring thicker than 4 inches is not practical. If the shoring is 1 inch thick, the load bearing border added is 1 inch wide if the shoring is 3 inches thick, the load bearing border added is 3 inches wide, and so on. This border is as wide as the shoring is thick.
When 2-inch-thick shoring is used, the area over which the load is distributed is enlarged by a 2-inch border all around the area of contact of the load and the shoring. In this case, the area of contact has increased by 122 percent, or more than doubled. Where these imaginary planes meet the cargo floor, the area of contact will be 10 times 16 inches, or 160 square inches ( Figure 6-2). Extend imaginary planes down and out from the edges of the bottom of the box through the plank at 45-degree angles. The area of contact between the box and the plank is 6 times 12 inches, or 72 square inches. A box resting on it is 12 inches long by 6 inches wide. To calculate the contact area of rectangular loads, multiply the width of the item by its length.Īssume that a plank is 2 inches thick. To determine how much shoring to use for a given load, compare the area of contact between the load and the shoring to the area of contact between the shoring and the aircraft cargo floor. The spreading effect of simple shoring is the same regardless of the shape of the area of contact. For example, a 2-inch shoring thickness increases the area of contact by 2 inches on all sides of the item resting on it provided the shoring extends at least 2 inches outward around the item being shored. Shoring only increases the area of contact by the shoring thickness on all sides of the object resting on it ( Figure 6-1). Shoring only increases the area over which a load rests at an angle of 45 degrees from the load contact areas to the surface on which the shoring rests. THE NEED FOR SHORINGĪlthough shoring spreads out the weight of a load, the weight of that load is not spread over the entire surface of the shoring. Consult your affiliated AMC ALCS for specific loading guidance and remain flexible. Not all AMC aircraft have the same cargo floor pressure limits. It can make the difference between carrying or not carrying a given piece of equipment or load. It decreases the approach angle of aircraft ramps, protects airport parking ramps, spreads weight over a larger area, or keeps 463L pallets off the ground. Shoring is lumber, planking, or similar material used to protect the aircraft cargo floor or 463L pallet surfaces.
Organizations offering cargo for air shipment must provide shoring. This chapter defines load shoring and assists the load planner in determining when, where, and how much to use.
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