Embraer EMB145 Operation Manual page 982

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EXAMPLE 2 (EMB-145 MODEL LR):

For the EMB-145LR on a standard configuration (50 seats) with the

passenger cabin divided in three sections.

Section A refers to rows 1 to 6, section B refers to rows 7 to 12 and

section C refers to rows 13 to 18.

Considering the window and aisle seating concept, the first seat to be

occupied is window-row 1, then window-row 2, then windows-row 3,

then windows-row 4, ..., then windows-row 18, then aisle-row 3, then

aisle-row 4, ..., then aisle-row 18.

When window-row 1 is occupied, there is a moment margin of the

passenger weight times the distance between cabin A centroid and row

1 centroid. When window-row 2 is occupied, the moment margin is

increased by the passenger weight times the distance between cabin A

centroid and row 2 centroid. The moment margin keeps increasing

until the seats aft of the cabin centroid start being filled and then

moment margin decreases.

When cabin B starts being filled, the moment margin starts increasing

again and then decreases when the seats aft of cabin B centroid are

filled. The same occurs with cabin C.

The forward seating allowance to be used in the determination of the

constrained CG envelope is the summation of the most negative

moment change of each cabin section.

For the aft seating allowance, a very similar procedure is performed,

but considering the aircraft being loaded from the aft portion of the

cabin, and considering the most positive moment change of each

cabin section.

The following tables show the determination of the forward and aft

seating allowances:

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