Bevel-helical gearbox B2 o on request Gear unit sizes iN Type B2-HH-15-D

Flender/Flender Gear Units/Bevel-helical gearbox B2

mple, Boeing 7F freighter aircraft may have payload of about1 metric tons. 5.5.1 Cargo Flights versus Passenger Flights Produce can be carried on either passenger ights or cargo ights. Generally, passenger ights are more regularly scheduled than cargo ights and, therefore, may be more conve-nient for produce with short shelf life. However, on passenger ights, passengers andbaggage are given higher priority than cargo. Therefore, there may not always be roomfor perishable produce on these ights. Some airlines offer special services at premiumto guarantee the transport of perishable freight. The higher rate is necessary to compensate for the loss of valuable payload to accommodate the heavier thermal units and the redistri- bution of these units (International Institute of Refrigeration, . On passenger ights, freight can be carried on the same deck as passengers and on the lower deck. When both freight and passengers are on the main deck, the passengersection is in the front or rear of the aircraft. On cargo ights, freight is carried on both the main and lower decks. 5.5.2 Loading Devices Loading and unloading of an aircrafts hold must be done rapidly since the time between the ights arrival and its departure is short. To shorten the time required for loading andunloading, cargo is generally stacked in unit load devices (ULDs) well ahead of the timeof loading. Many sizes of ULD are available to the internal dimensions of various aircraft cargo holds. The most common sizes of the base of these devices are 2 mm /H1 mm (8 in /H1 in) and 2 mm /H1 mm (9 in /H1 in) (International Institute of Refrigeration, . Each model of ULD has specic gross weight it can hold. Half-size models generally hold 1 kg of cargo; full size models can hold up to 6 kg(International Institute of Refrigeration, . ULDs are constructed to be lightweight, 5 Hui et al. because weight is major concern of aircraft. ULDs are therefore readily damaged and require special handling devices. Con