by motor pump LP B V Dip lubrication LP B3-FV-4-A Bevel-helical gearboxes B3

Flender/Flender Gear Units/Bevel-helical gearboxes B3

sequently, their use is generally restricted to theairfreight stage of the journey. The two main categories of ULDs used are aircraft pallets and aircraft containers. However, in the newer wide-bodied cargo aircraft, intermodal containers can also be used. 5.5.2.1 Aircraft Pallets Aircraft pallets are lightweight aluminum sheets about 5 mm thick, with special edge rail sections about 1 mm thick, to which the restraining hardware secures the pallet to theaircraft. The edge rails also incorporate slots for engaging the end hooks of the nettingused to secure the cargo to the pallet (Peleg, . Besides the netting, aircraft pallets are generally only covered with polyethylene lm to protect against dust and rain. Cargo must be stacked on aircraft pallets so that it does not exceed the contour of the hold. In the lower deck, cargo can extend out over the pallet itself to maximize spaceutilization. pallet wing or pallet extension can be used in this arrangement to supportthe overhanging boxes (International Institute of Refrigeration, . Produce shipping containers can be stacked directly on the aircraft pallets or can be unitized on regular pallets or slipsheets beforehand (Peleg, . In the rst case, there is better volume utilization of the aircraft; however, the individual produce shippingcontainers must be handled more frequently. In the latter case, unit loads of produce canbe loaded onto the aircraft pallet with forklift, but some space is lost because of thepresence of the regular pallets and gaps between them. The whole stack is also less stable. Aircraft pallets are not necessarily handled by forklifts. They are generally trans- ferred on either roller systems, ball mat, or inverted casters. 5.5.2.2 Aircraft Containers Aircraft containers are built to the standard contours of aircraft holds and, therefore, maximize the utilization of the cargo holds. Containers used for the lower deck of anaircraft usually have an overhang, whereas those for the main deck are