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## Determining the Maximum Amount of Payload That Can Be Carried 

The primary function of a transport or cargo aircraft is to carry payload, which is the portion of the useful load, passengers, or cargo that produces revenue. To determine the maximum amount of payload that can be carried, both the maximum limits for the aircraft and the trip limits imposed by particular trip must be considered. In each of the following steps, the trip limit must be less than the maximum limit. If it is not, the maximum limit must be used. 

These are the specifications for the aircraft in this example 

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1. Compute the maximum takeoff weight for this trip. This is the maximum landing weight plus the trip fuel. [Figure 9-30] 

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2. The trip limit is lower than the maximum takeoff weight, so it is used to determine the zero fuel weight. [Figure 9-31] 

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3. The trip limit is again lower than the maximum takeoff weight, so use it to compute the maximum payload for this trip. [Figure 9-32] 

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Under these conditions, 27,500 pounds of payload may be carried. 

## Determining the Landing Weight 

It is important to know the landing weight of the aircraft in order to set up the landing parameters and to be certain the aircraft is able to land safely at the intended destination. 

In this example of a four-engine turboprop airplane, determine the airplane weight at the end of 4.0 hours of cruise under these conditions: 

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Refer to the U.S. Standard Atmosphere Table in Figure 9-33 and the gross weight table in Figure 9-34  when completing the following steps: 

1. Use the U.S. Standard Atmosphere Table to determine the standard temperature for 16,000 feet (–16.7 °C). 

2. The ambient temperature is –32 °C, which is a deviation from standard of 15.3 °C. (–32° – (–16.7°) = –15.3°). It is below standard. 

3. In the gross weight table, follow the vertical line representing 140,000 pounds gross weight upward until it intersects the diagonal line for 16,000 feet pressure altitude. 

4. From this intersection, draw a horizontal line to the left to the temperature deviation index (0 °C deviation). 

5. Draw a diagonal line parallel to the dashed lines for Below Standard from the intersection of the horizontal line and the Temperature Deviation Index. 

6. Draw a vertical line upward from the 15.3 °C Temperature Deviation From Standard. 

