Subdivision - Attained Index A

Attained subdivision index A from partial indices at three drafts - ds (deepest), dp (partial), dl (lightest) per SOLAS II-1 Reg. 6.

SubdivisionA indexSOLAS

A at deepest draftA at partial draftA at lightest draftRequired R

Attained A: 0.7660 -

Margin vs R: 0.0660 -

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

A = 0.4 A_s + 0.4 A_p + 0.2 A_l

Symbol	Meaning	Unit
$A_s$	Attained at deepest subdivision draft
$A_p$	Attained at partial subdivision draft
$A_l$	Attained at lightest subdivision draft

Source: SOLAS II-1 Reg. 6

In short

Attained subdivision index A from partial indices at three drafts - ds (deepest), dp (partial), dl (lightest) per SOLAS II-1 Reg.

Learn the theory Intact stability