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Tiedown devices................................................. 33 lbs
Floor load limit................ 169 pounds per square foot
The pallet has an area of 36 inches (3 feet) by 48 inches
(4 feet). This is equal to 12 square feet. The floor has a
load limit of 169 pounds per square foot; therefore, the
total weight of the loaded pallet can be 169 x 12 = 2,028
pounds.
Subtracting the weight of the pallet and the tiedown
devices gives an allowable load of 1,948 pounds
(2,028 - [47 + 33]).
7–
These are the specifications for the aircraft in this example:
Basic operating weight (BOW)................100,500 lbs
Maximum zero fuel weight......................138,000 lbs
Maximum landing weight........................142,000 lbs
Maximum takeoff weight.........................184,200 lbs
Fuel tank load ............................................54,000 lbs
Est. fuel burn en route................................40,000 lbs
1. Compute the maximum takeoff weight for this trip.
This is the maximum landing weight plus the trip fuel.
Max. Limit Trip Limit
142,000 Landing weight 142,000
+ trip fuel + 40,000
184,200 Takeoff weight 182,000
2. The trip limit is the lower, so it is used to determine the
zero fuel weight.
Max. Limit Trip Limit
184,200 Takeoff weight 182,000
- fuel load -54,000
138,000 Zero fuel weight 128,000
3. The trip limit is again lower, so use it to compute the
maximum payload for this trip.
Max. Limit Trip Limit
138,000 Zero fuel weight 128,000
- BOW - 100,500
Payload (pounds) 27,500
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 airplane
in order to set up the landing parameters, and to be certain
the airplane will be able to land 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:
Takeoff weight.........................................140,000 lbs
Pressure altitude during cruise..................16,000 feet
Ambient temperature during cruise..................-32°C
Fuel burned during descent and landing......1,350 lbs
Determine the weight at the end of cruise by using the
Gross Weight Table of Figure 7-4 and following these
steps:
Determine the floor load limit that is needed to carry a
loaded cargo pallet having these dimensions and weights:
Pallet dimensions ........... 48.5 by 33.5 in
Pallet weight ................................. 44 lbs
Tiedown devices ........................... 27 lbs
Cargo weight ........................... 786.5 lbs
First determine the number of square feet of pallet area:
Then determine the total weight of the loaded pallet:
Pallet 44.0 lbs
Tiedown devices 27.0 lbs
Cargo 786.5 lbs
857.5 lbs
Determine the load imposed on the floor by the loaded
pallet:
The floor must have a minimum load limit of 76 pounds
per square foot.
Determining the Maximum Amount of
Payload That Can Be Carried
The primary function of a transport or cargo aircraft is
to carry payload. This is the portion of the useful load,
passengers or cargo, that produces revenue. To determine
the maximum amount of payload that can be carried,
follow a series of steps, considering both the maximum
limits for the aircraft and the trip limits imposed by the
particular trip. In each step, the trip limit must be less than
the maximum limit. If it is not, the maximum limit must be
used.
7–
1. Use the U.S. Standard Atmosphere Table in Figure 7-5
to determine the standard temperature for 16,000 feet.
This is -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 Figure 7-4, 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.
Figure 7-4. Gross Weight Table.
7–10
7. Draw a horizontal line to the left from the intersection
of the “Below Standard” diagonal and the 15.3°C
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Aircraft Weight and Balance Handbook(27)
