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?
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.
Your Notes (not visible to others)
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