Getting to Grips with Aircraft Weight and Balance(56)

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(H .
arm .
H)
item item item 25
.Indexitem =
C =
C
.Index is calculated for any person or item that can be loaded on board the aircraft. In the AHM560, .Index figures are usually given for 1 kg (or 1 lb) of weight.
Weight item =1 and H .armitem is read in the Weight and Balance Manual.
2.2. .
Index for additional crew member
WBM 1.40 Personnel chapter gives information on the position of all the flight and cabin crew seats.
. Ex : A330-200 additional Flight crew member

H25 = 33.1555 m, C = 2500 kg.m, K = 100 1× (9.8 . H25 ) (9.8 . 33.1555)
.Index(1kg) == =.0.00934 IU / kg
Flight Crew Third occupant
C 2500 So for one additional person in the cockpit (85 kg) : .Index(85kg) =.0.794 IU
Note 1: the calculation principle is the same for cabin crew members.
Note 2: in the AHM560, for cockpit crew members information is displayed as shown below.

WEIGHT AND
BALANCE
WEIGHT AND
BALANCE
C. BALANCE CHART DESIGN

5. COCKPIT
5.1 Number of seats and average station
Maximum number of cockpit seats  Length of arm from reference station  Index influence per 1 kg 
meters 
4  -23.807  -0.00952 

Remarks:
The .Index value is given for the average H-arm of the 4 cockpit positions. H . arm + H . arm + H . arm + H . arm
Captain First Officer Third occupant Fourth occupant
H . arm =
Cockpit average
4
(H . armCockpit average . H25 )
.Index(1kg) =
Cockpit average
C
2.3. .
Index for additional weight on the upper deck
WBM 1.50 Interior Arrangement chapter describes the different stowage capacities in the flight and cabin compartments, the galleys and the toilets. This section gives information on the H-arm of each item: flight compartment stowage, overhead stowage compartments, cabin stowage compartments, galleys, toilet.
. Ex : A330-200 galleys capacities and positions

H25 = 33.1555 m, C = 2500 kg.m, K = 100 1× (10.714 . H25 ) (10.714 . 33.1555)
.Index(1kg)G1b == =.0.00898 IU / kg
C 2500
Note : Each item H-arm represents the load CG position, it is usually located at the item barycentre.
126

C. BALANCE CHART DESIGN

2.4. .
Index for passenger boarding
WBM 1.40 Personnel chapter gives information on the H-arm of each passenger seat row CG position.

Note : passenger seat CG is usually located in the middle of the seat.
H25 =33.1555 m, C =2500 kg.m, K =100 1×(13.885 .H25 ) (13.885 .33.1555)
.Index(1kg) == =.0.00771IU / kg
Center seat row 1
C 2500 .Index(1kg) =.Index(1kg)
Window seat row 2 LH Window seat row 2 RH
1×(14.520 .H ) (14.520 .33.1555)
= 25 = =.0.00745 IU / kg
C 2500
These .Index values per kg are presented in the AHM560, nevertheless on the manual balance chart it is not possible to take into account the .Index of each individual row.
　
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