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# AIRCRAFT WEIGHT AND BALANCE

AIRCRAFT WEIGHT AND BALANCE. WELCOME. Class starts after video . Objective. Comprehend how to accomplish weight and balance computations . Overview. Aircraft Center of Balance Planning Characteristics Weight and Balance Theories CB Computations Student Exercise.

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## AIRCRAFT WEIGHT AND BALANCE

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1. AIRCRAFT WEIGHT AND BALANCE

2. WELCOME • Class starts after video

3. Objective • Comprehend how to accomplish weight and balance computations

4. Overview • Aircraft Center of Balance • Planning Characteristics • Weight and Balance Theories • CB Computations • Student Exercise

5. Aircraft Center of BalanceDefinition and Purpose • (CB) is the point where the aircraft balances • CB is affected by many factors • CB location must remain within specified limits

6. Aircraft Center of BalanceDefinition and Purpose • Each aircraft has a specified forward and aft limit • The only way to ensure a safe, balanced aircraft is to find the CB of a load and to determine if it will fall in the proper location of the aircraft

7. Aircraft Center of BalanceTerms Reference Datum Line (RDL) • A line at or near the aircraft nose • All longitudinal distances are measured from the RDL

8. Aircraft Center of BalanceTerms • Fuselage Station (FS) - measurements in inches from the RDL • There are numbers on the wall of an aircraft which indicates how many inches from the RDL • We use these numbers for computing an aircraft CB

9. Aircraft Center of BalanceTerms • Moment (M) - the product that results by multiplying the distance (inches from the RDL, also referred to as the arm) by the weight (pounds) • Weight ×Arm = Moment

10. Aircraft Center of BalanceTerms • Center of Balance (CB) • The point at which items balance • This point is measured in inches from the reference datum line • Gross Weight (GW) • The total weight of all cargo, troops and baggage

11. Aircraft Center of Balance Weight and Balance • Effectively using the Allowable Cabin Load (ACL) and cargo space available • Load planner ensures the load’s center of balance is within the aircraft center of balance range

12. Add the total weight of all cargo, troops, and baggage Enter the “cabin load” column in figure 2.1 Track down the column vertically until you reach the range that your weight falls within Aircraft Center of Balance Determining CB Range Page 2-4 in Workbook C-130 20,001 – 25,000

13. Aircraft Center of BalanceDetermining CB Range C-130 • Follow the line horizontally until you are in the vertical column for your type of aircraft • The two numbers represent the CB range 485 – 530 20,001 – 25,000

14. Planning Characteristics Weight • Allowable Cabin Load (ACL) • The weight of cargo that may be transported by a specific aircraft • ACL is limited by several factors • Distance • Route • Fuel load • Weather • Airfield characteristics • Runway length

15. Planning Characteristics Weight • Personnel who prepare load plans must be familiar with the weight limitations of available aircraft

16. Planning Characteristics Weight C-130 ------------ 25,000 pounds Planning ACL based on average wind factors throughout the world

17. Planning Characteristics Aircraft • Loadplanners must know the physical characteristics of available aircraft • Characteristics to know: • Location and size of cargo door • Size of cargo compartment • Location and number of troop seats • Optimum center of balance • Loading aids available

18. Weight and Balance TheoriesMethods • There are two common methods for loadplanning an aircraft • “Pyramid” method • “50 – 50” method

19. Weight and Balance Theories “Pyramid” Heaviest Cargo Lightest Cargo Lightest Cargo Cargo Load 500 lbs 1000 lbs 500 lbs 1000 lbs 2500 lbs 5000 lbs 2500 lbs C/B

20. Weight and Balance Theories “50 – 50” 1000 lbs 1000 lbs Cargo Load 50% of the cargo is placed on either side of the optimum cargo load center of balance C/B

21. CB ComputationsFormulas • Weight × Distance (Arm) = Moment 6,500 × 850 = 5,525,000 • Total Moment ÷ Total Weight = Total CB 5,525,000 ÷ 6,500 = 850

22. CB Computations Simplification • C-130 by 1,000 (shift decimal 3places left)

23. CB Computations Example • C-130 Simplified Moment Example • Moment = 5,674,570 • 5,674,570 ÷ 1,000 = 5,674.570 • Simplified Moment = 5,675

24. Exercise • Workbook 36-101 Volume II

25. 4,795 4,250 R L 420 C-130 600 0 Exercise WB 36-101 4,250× 420 = 1,785,000 ÷ 1,000 = 1,785 4,795× 600 = 2,877,000 ÷ 1,000 = 2,877 9,0454,662 4,662 ÷9,045 = .51542 × 1,000 = 515 400-----(515)-----550 WEIGHTFSMOMENT

26. 6,500 lbs 6,500 lbs TP-40 TP-40 R L 405 635 0 Exercise WB 36-101 6,500× 405 = 2,632,500 ÷ 1,000 = 2,633 6,500× 635 = 4,127,500 ÷ 1,000 = 4,128 13,0006,761 6,761÷13,000 = .520076 × 1,000 = 520 475----(520)----530 C-130 WEIGHTFSMOMENT

27. Summary • Aircraft Center of Balance • Planning Characteristics • Weight and Balance Theories • CB Computations • Student Exercise

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