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54 Airport Passenger Terminal Planning and Design Figure 68. Example of typical single aircraft claim unit sizing. Baggage Claim Time in Use The minimum time a claim unit would be in use for an individual flight helps establish the turnover of claim units. Turnover is more significant for widebody aircraft. The following factors are required for estimating the time a claim unit is in use for an individual flight: Aircraft seating capacity Design hour load factor Percentage of passengers terminating at this airport Percentage of passengers with checked bags The average number of bags/passenger The average bag unloading rate. This rate varies depending on the size of the bags and the number of feed conveyors per claim unit In addition to the time needed to unload the checked bags, additional time is added for bags that are not claimed on the first rotation of the claim unit because passengers either fail to see them or arrive late (add up to 10 minutes, unless there are unusual conditions). As shown in the example in Figure 69, narrowbody domestic flights typically occupy a claim unit for 20 minutes or less (which results in the typical approach of sizing domestic baggage claim for a peak 20-minute period). Widebody flights can occupy a claim unit for significantly longer periods, which is why units sized for large aircraft typically are configured with two feed conveyors. Baggage Claim Unit Types The two basic types of claim units are flat plate and sloped bed. See Figure 70. Flat plate units can be designed in various configurations; "L," "T," "U," and variations of these are most common. Direct-feed, flat plate units are simpler to maintain and are generally Figure 69. Example of Baggage Claim Use Time

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Baggage Claim Model 55 10-12FT / 3-3.7M bypass lane 10FT / 3M carts 3FT / 0.9M work aisle 13FT / 3.9 M containers Flat Plate units: suggest max length to width 15FT / 4.5M min. ratio of 1.5 : 1 30FT / 9M min. if no columns 10FT / 3M typical Sloped Bed units: Potential for second input conveyor 18-25FT / 5.5-7.5M typical 35-40FT / 10.7-12.2M for int'l pax using bag carts if no columns Figure 70. Typical baggage claim units. preferred if the baggage off-load area is on the same level as the claim area. Bags are loaded on the secure side, pass though fire/security shutters (which are closed when the claim unit is not in use), and are claimed by passengers in the (typically) non-secure baggage claim lobby. Unclaimed bags will circulate back through the loading area. The minimum outside radius is typically 5 feet resulting in a 10-foot wide unit. It is recom- mended that the ratio of clear length of the "arms" to the width of the unit be no greater than 1.5:1. This ratio will limit deep, narrow bays, which can cause passenger congestion. Sloped bed units (often referred to generically as "carousels") are almost always configured as ovals. Sloped bed units are fed from one or two conveyors, with larger international terminals typically preferring two conveyors because of the time required to deliver the larger number of