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inches, and the new CG is:
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° 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]).
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:
Floor Load—Caution
Loaded cargo pallets must be checked to be sure they do not impose
a load on the floor that is greater than the floor load limit.
The change in the CG in % MAC is determined by using
this formula:
The new CG in % MAC is the sum of the old CG plus the
change in CG:
Notice that the new CG is in the same location whether the distances
are measured from the datum or from the index point.
Determining Cargo Pallet Loads with
Regard to Floor Loading Limits
Each cargo hold has a structural floor loading limit based on
the weight of the load and the area over which this weight is
distributed. To determine the maximum weight of a loaded
cargo pallet that can be carried in a cargo hold, divide its total
weight, which includes the weight of the empty pallet and
its tiedown devices, by its area in square feet. This load per
square foot must be equal to or less than the floor load limit.
In this example, determine the maximum load that can be
placed on this pallet without exceeding the floor load limit.
Pallet dimensions ................................................ 36 by 48 in
Empty pallet weight ..................................................... 47 lbs
Tiedown devices ........................................................... 33 lbs
Floor load limit ........................169 pounds per square foot
6 – 10
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.
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
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飞机载重平衡手册(30)
