Character position definition and scope:

A one-character alphabetic code indicates whether or not there are special elevators (i.e., they are wide enough to accommodate wheelchairs) and whether the elevator control buttons have raised letters or braille markings on them to accommodate people with disabilities.

Guidelines for applying content designators:

Code:

Description:

a

No special elevators or control buttons

b

Special elevators and control buttons

c

Special elevators only

d

Special control buttons only

e

No elevators

n

Not applicable

u

Unknown

See also:

007  Physical Description Fixed Field

Variable Control Fields