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## Determining Fuel Dump Time in Minutes 

Most large aircraft are approved for a greater weight for takeoff than for landing. To make it possible for them to return to landing soon after takeoff, a fuel jettison system is sometimes installed. It is important in an emergency situation that the flight crew be able to dump enough fuel to lower the weight to its allowed landing weight. This is done by timing the dumping process. 

In this example, the aircraft has two engines operating and these specifications apply 

<img src='content_image/528620.jpg'>

Average fuel flow during 

<img src='content_image/528621.jpg'>

To calculate the fuel dump time in minutes: 

1. Determine the amount of weight the aircraft must lose to reach the maximum allowable landing weight. [Figure 9-36] 

<img src='content_image/528624.jpg'>

2. Determine the amount of fuel burned from the beginning of the dump to touchdown. [Figure 9-37] 

<img src='content_image/528625.jpg'>

For both engines, this is 52.83 × 2 = 105.66 lb/minute. 

The engines burn 105.66 lbs of fuel per min for 19 minutes (the duration of the dump), which calculates to 2007.54 pounds of fuel burned between the beginning of the dump and touchdown. 

3. Determine the amount of fuel needed to dump by subtractingtheamountof fuelburned duringthedump from the required weight reduction. [Figure 9-38] 

<img src='content_image/528622.jpg'>

4. Determine the time needed to dump this amount of fuel by dividing the number of pounds of fuel to dump by the dump rate. [Figure 9-39] 

<img src='content_image/528623.jpg'>

## Weight and Balance of Commuter Category Airplanes 

The Beech 1900 is a typical commuter category airplane that can be configured to carry passengers or cargo. Figure 9-40 shows the loading data of this type of airplane in the passenger configuration 

## Determining the Loaded Weight and CG 

As this airplane is prepared for flight, a manifest is prepared. [Figure 9-41] 

