5.3. PART B: GENERAL INFORMATION.........................................................................187
5.4. PART C: AIRCRAFT DATA........................................................................................187
5.5. PART D: LOAD PLANNING DATA.............................................................................189
D. Load and Trim Sheet software ..............................................191
1. Introduction.......................................................................................................................191
2. Objectives.........................................................................................................................191
3. Software description.........................................................................................................192
3.1. Unit system:...............................................................................................................192
3.2. Aircraft modifications:.................................................................................................192
3.3. Aircraft configurations: ...............................................................................................193
3.4. Cabin layout:..............................................................................................................194
3.5. Operational margins customization............................................................................195
A. GENERALITIES
GENERALITIES INTRODUCTION
The purpose of this section is to present the impact of the aircraft CG position on aircraft performance and the certified limits design process. First it is necessary to define precisely what is the Center of Gravity, the way to express it in relation to the Reference Chord (RC) and to detail the forces applied on the aircraft.
WEIGHT AND
BALANCE
A. GENERALITIES
A. GENERALITIES
1. DEFINITIONS
1.1. Center of Gravity (CG)
The Center of Gravity or CG is the point where the aircraft‘s weight is applied. The position of the CG has to stay within certain limits to ensure aircraft maneuverability and stability and also the aircraft structure integrity.
1.2. Mean Aerodynamic Chord (MAC)
All the limitations and the definitions related to weight and balance aspects use what is called the Mean Aerodynamic Chord (MAC) or the reference chord (RC). For example, the position of the center of gravity (CG) is usually expressed in terms of percentage of MAC. The safe limits for the CG are also expressed in terms of percentage of MAC (the symbol used is %MAC)
The MAC is a reference line used in the design of the wing; its position relative to the wing and the fuselage is accurately known. The position and dimensions of this reference line are mentioned in the Weight and Balance Manual (WBM Chapter 1.00.05 page2).
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