18 / 20

Refer to figure.
Using the data given at the appendix to this question, if the fuel index corrections (from ZFM index) are as follows:

FUEL INDEX
9 500 kg -0.9
6 500 kg -6.1
3 500 kg -4.7
3 000 kg -4.3
Which of the following represent the correct values for landing mass of the aeroplane and the position of the centre of gravity for this condition?
  • A

    52900 kg and 21.6%

  • B

    49130 kg and 21.8%

  • C

    52900kg and 18.8%

  • D

    49130 kg and 19%

Refer to figure.
Things to note from the question:

  • We have been given the DOM, Traffic Load and fuel figures so can quickly calculate the Landing Mass (see Step 1 below)
  • The DOI is given as 33.5 on the trim sheet
  • All the cargo and passengers numbers are already on the trim sheet
  • We will have to do a drop line to find the LM CG %MAC which will take time and probably make this a 2 mark question
  • We need the LM fuel Index: Take-off fuel is 9500 kg. Trip fuel burnt is 6500 kg. Fuel on landing is 3000 kg, so use -4.3 for the fuel index.

Step 1. According to the Load Sheet, the Landing Mass is:

DOM + TL + Fuel on Landing (Take-off Fuel - Trip fuel)

34 900 kg + 11 230 kg + (9500 - 6500 = 3000) = 49 130 kg.

Step 2. In the Trim Sheet (Part B), the DOI is given, and all the masses of passengers and cargo are given. So, follow through the grids moving in the direction of the arrows for the correct number of divisions, including the fuel index, as shown in the figure. The scale is marked on each grid. Once the line reaches the CG envelope, drop straight down until it crosses the LM, 49 130 kg. So, the Centre of Gravity in %MAC can be read as 19%.

Note: On the fuel index - each vertical line represents one unit of trim to add or remove.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.

  • Austro Control
    10
  • Greece
    3
  • Ireland
    2
  • Portugal
    2
  • Slovakia
    2
  • Sweden
    2
  • Czech Republic
    1
  • Italy
    1
  • Lithuania
    1
  • Poland
    1