Initial issue
EASA Approved
Page 6-13
Example of Calculation
TASK:
Determine the aircraft takeoff weight and moment for the following flight conditions:
•
Aircraft basic empty weight
350.0 kg
•
Aircraft basic empty moment
922.90 kg.m
•
Pilot
90.0 kg
•
Co-pilot (passenger)
81.0 kg
•
Baggage
10.0 kg
•
Usable fuel in tanks
57.6 kg (80 l)
CALCULATION:
NOTE
Calculations of the loaded aircraft
’s weight and
moment example
are made in the metric system.
1.
Obtain and record the aircraft data into a photocopy of the Weight and Balance Loading Form (Chapter 6.4.2).
2.
Obtain and record the Basic Empty Weight and Moment of the aircraft in line No. 1, from the Weight and Balance
Record (Chapter 6.3). For the purpose of example, the values given in the task have been used.
3.
Obtain and record the pilot, co-pilot (passenger), baggage, usable fuel weights and moments using the loading
data (Chapter 6.5) and record them appropriately in lines No. 2 through 6.
4.
Adding the weights in lines No. 1 through 5
the takeoff weight
(line No. 6) is obtained (this must be lower than the
weight limits given in Chapter 2.4.
Adding the static moments in lines No. 1 through 5 the resulting static
takeoff
moment
(line No. 6) is obtained.
5.
Adding the weights in lines No. 1 through 4
the zero fuel weight
(line No. 7) is obtained.
Adding the static
moments in lines No. 1 through 4 the resulting static
zero fuel moment
(line No. 7) is obtained.
6.
Plot the takeoff weight and moment from line No. 6 and the zero fuel weight and moment from line No. 7 into the
appropriate Weight and Moment Limits Chart (Chapter 6.6). The intersection of both values must be within the
represented approved limits envelope.
The example is shown on Fig. 6-4. The aircraft
’s Center of Gravity Arm is calculated by dividing the
aircraft
’s moment
by the aircraft
’s weight.
CONCLUSION
The intersection of the takeoff weight and moment and zero fuel weight and moment are within the approved limits
of the Weight and Moment Limits Chart (see Fig. 6-4).
From the point of view of the aircraft weight and CG, the flight
can be realized
.
WARNING
Takeoff weight and CG must be calculated before each flight!
Fuel consumption moves the CG rearwards, therefore the CG must
be calculated for zero fuel as well!
Содержание WT9 Dynamic LSA / Club
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