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Refer to figures. 
Using the trim sheet and also the fuel index correction table for the Medium Range Jet Transport (MRJT) aircraft, what is the CG position as a percentage of MAC at Landing Mass?

  • A

    18.0%

  • B

    21.6%

  • C

    24.2%

  • D

    28.5%

Refer to figures. 
Step 1:

  • From the load sheet we can find the take-off fuel mass as 11 520 kg.
  • From the load sheet we can also find the trip fuel mass as 8810 kg.
  • 11 520 kg - 8810 kg = 2710 kg fuel on board at landing
  • Using the fuel index table: there is no index for 2710 kg, so the next highest mass is used, which is 3000 kg. This equates to an index of -4.3

Step 2:

Using the trim sheet:

  • The red line, filled in by the examiner, ends at the rear passenger section.
  • Continue the line (in green in the attachment) vertically into the fuel index row.
  • Plot -4.3 units to the left to include the landing fuel index.
  • Drop the line vertically into the trim envelope.

Step 3:

  • From the load sheet we can find the landing mass as 47 770 kg.
  • Draw a line (in blue in the attachment) horizontally across the trim envelope from this mass on the left hand side scale.
  • Where the two lines cross = Landing CG.
  • The Landing CG can be read from the fan lines and is between the 21% and 22% fans at 21.6% MAC.

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