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A C-17 in CP-1 configuration with a crew of five will fly a four-hour mission with a takeoff fuel of 115,000 lbs. The basic aircraft weight is 275,000 lbs. What is the ACL (Allowable Cabin Load) for this mission?

A. 168,982 lbs.
B. 191,582 lbs.
C. 256,582 lbs.
D. 168,418 lbs.

Answer :

To determine the Allowable Cargo Load (ACL) for the C-17 in the CP-1 configuration, we need to follow these steps:

  1. Identify and List Known Weights:

    • Basic Aircraft Weight (BAW): 275,000 lbs
    • Takeoff Fuel: 115,000 lbs
    • Crew Members: 5
    • Standard Weight for Crew: Typically 200 lbs each (this assumption might vary based on specific regulations, but it's a common standard for planning purposes)

  2. Calculate Total Crew Weight:
    [tex]\text{Total Crew Weight} = 5 \times 200 = 1,000 \text{ lbs}[/tex]

  3. Calculate Total Operating Weight Before Payload (OWBP):
    Total Operating Weight Before Payload is the sum of Basic Aircraft Weight, Takeoff Fuel, and Crew Weight.

    ( \text{OWBP} = \text{BAW} + \text{Fuel} + \text{Crew Weight} \
    \text{OWBP} = 275,000 + 115,000 + 1,000 = 391,000 \text{ lbs} )

  4. Determine Maximum Takeoff Weight (MTOW):
    For a C-17, the Maximum Takeoff Weight is commonly about 585,000 lbs. However, always verify with specific mission data or aircraft specifications.

  5. Calculate Allowable Cargo Load (ACL):
    The ACL is the difference between the Maximum Takeoff Weight and the Total Operating Weight Before Payload.

    ( \text{ACL} = \text{MTOW} - \text{OWBP} \
    \text{ACL} = 585,000 - 391,000 = 194,000 \text{ lbs} )

However, the listed choices are slightly below this calculated ACL. This could suggest an error in choices or assumptions.

From the provided options, the closest reasonable ACL near practical mission planning values is 191,582 lbs.

Answer: 191,582 lbs

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