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A C-5 with a crew of 10 will fly a three-hour mission with ramp fuel of 93,000 lbs. The basic aircraft weight is 367,500 lbs. What is the ACL (Allowable Cargo Load) for this mission?

A. 150,000 lbs.
B. 244,999 lbs.
C. 294,149 lbs.
D. 308,149 lbs.

Answer :

To find the Allowable Cabin Load (ACL) for this mission, we need to consider the components that make up the aircraft's weight during the mission:

  1. Basic Aircraft Weight (BAW): This is the weight of the aircraft itself without any payload, fuel, or crew members. In this scenario, it is 367,500 lbs.

  2. Ramp Fuel Weight: This is the weight of the fuel that the aircraft will utilize from start to finish of the mission. It is given as 93,000 lbs.

  3. Crew Weight: We need to account for the weight of the crew who will be on board during the flight. Typically, the average weight per crew member is considered to be around 200 lbs, but this value can vary depending on specific assumptions or standards used. For our calculation, we will assume 200 lbs per crew member:
    [tex]\text{Crew Weight} = 10 \times 200 \text{ lbs} = 2,000 \text{ lbs}[/tex]

To calculate the Maximum Takeoff Weight (MTOW), which includes the basic aircraft, the fuel, and the crew, we add:
[tex]\text{MTOW} = 367,500 \text{ lbs (Basic Aircraft Weight)} + 93,000 \text{ lbs (Fuel)} + 2,000 \text{ lbs (Crew)}[/tex]
[tex]\text{MTOW} = 462,500 \text{ lbs}[/tex]

The Maximum Tolerable Weight (MTW) for a C-5 aircraft usually dictates the maximum weight of the aircraft including its payload at takeoff. Assuming the MTW for this aircraft is set to 769,000 lbs (this is a common standard for C-5s, but can vary slightly depending on specific aircraft configurations), the ACL can be found by deducting the MTOW from the MTW:
[tex]\text{ACL} = \text{MTW} - \text{MTOW}[/tex]
[tex]\text{ACL} = 769,000 \text{ lbs} - 462,500 \text{ lbs} = 306,500 \text{ lbs}[/tex]

Since none of the choices exactly match, there might be a standard assumption or a specific data point missing that aligns the given options. Based on the choices, and rounding likely adjustments taken into account, the closest choice is:

308,149 lbs.

Therefore, the ACL for this mission is: 308,149 lbs.

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