Refer to figure or CAP 696 file 4.12.
Given the following information, determine the CG % MAC at Take-Off Mass (TOM);
Take-off Mass (TOM): 55 080 kg
Zero Fuel Mass (ZFM): 45 000 kg
Take-off Fuel: 10 080 kg
Take-off Index: 23.3
Zero Fuel Index: 25.4
Passenger Distribution:
0a = 5
0c = 5
0f = 7
Fuel Index: -4
Dry Operating Index: 24
Refer to figure.
Be aware: the examiner has given plenty of surplus information, a common trick in this subject.
The Load/Trim sheet is in two parts:
- Part B (to the right) is the trim portion, which helps to establish the CG %MAC and ensure that it lies within the envelope:
- Using the data given, start by drawing a horizontal line from the TOM 55 080 kg.
- Then, draw a vertical line from the Take-off Index 23.3
- The intersection between the horizontal line and the vertical line represents the TOM CG position, 11% MAC.
As seen from the figure, the CG % MAC at TOM is within limits and in a forward position.
- Part A of the load sheet (to the left) is a loading summary which is divided in 3 sections:
- Section 1 is used to establish the limiting take-off mass, the maximum allowable traffic load and the underload before last minute changes (LMC).
- Section 2 shows the distribution of the traffic load.
- Section 3 is used to summarise load and cross check that limits have not been exceeded.
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