. Or all window and aisle seats are full and all the center seats in front of the average H-arm are full and all the center seats aft of the average H-arm are empty.
H-arm real passenger
The aft inaccuracy is computed following the same passenger seating configuration but with passengers first seated in the rear part of the cabin section.
Note : on the majority of cabin layouts the second option generates the highest significant inaccuracy.
C. BALANCE CHART DESIGN
The passenger distribution inaccuracy is determined for each cabin section that is represented on the balance chart. Then the total inaccuracy is determined considering each cabin section inaccuracy independent from the other ones.
Note : when an EDP system is used to compute the aircraft CG position and weight, then the passenger delta index may be determined for each individual passenger seat row, in this case the passenger distribution inaccuracy is nil.
Note : when applying the realistic boarding scenario, it is considered that all the passenger seats are available. In some case airlines may decide that some seats must remain unoccupied, for example if one emergency exit is inoperative. In these specific cases passenger boarding may generate a higher inaccuracy than the one taken into account in the operational margin determination. It is worth taking in account additional margins for those specific cases. These margins are computed for each specific cabin layout and unoccupied seats configurations.
WEIGHT AND
BALANCE
WEIGHT AND
BALANCE
C. BALANCE CHART DESIGN
Inaccuracy for cabin OA
Ecabin OA distribution fwd = Wpax in cabin OA fwd x (H-armpax in cabin OA fwd. H-armOA)
Wpax in cabin OA fwd = 8 x Pax average weight = 8 x 84 = 672 kg H ×
4 ×
Pax average weight +
H ×
2 ×
Pax average weight +
H ×
2 ×
Pax average weight
row1 row2 row3
H -arm =
pax in cabin OA fwd
8 ×
Pax average weight
9.475 ×
4 ×
84 +
10.44 ×
2 ×
84 +
11.405 ×
2 ×
84
H -arm ==
10.2m
pax in cabin OA fwd
8 ×
84 Ecabin OA distribution fwd = 672 x (10.2 . 10.44) = . 161.28 kg.m
Inaccuracy for cabin OB
Ecabin OB distribution fwd = Wpax in cabin OB fwd x (H-armpax in cabin OB fwd . H-armOB)
Wpax in cabin OB fwd = 34 x Pax average weight = 34 x 84 = 2856 kg H-armpax in cabin OB fwd = 15.37 m Ecabin OB distribution fwd = 2856 x (15.37 . 16.39) = . 2913.12 kg.m
Inaccuracy for cabin OC
Ecabin OC distribution fwd = Wpax in cabin OC fwd x (H-armpax in cabin OC fwd. H-armOC)
Wpax in cabin OC fwd = 36 x Pax average weight = 36 x 84 = 3024 kg H-armpax in cabin OC fwd = 24.35 m Ecabin OC distribution fwd = 3024 x (24.35 . 25.53) = . 3568.32 kg.m
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