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This text refers to items from 1 through 10.

Balance weight was missing

A post-flight inspection revealed that half of one of the

balance weights from the right elevator spring tab was missing,

along with two nuts that secured the balance weight. The report

said that the two bolts associated with the nuts had migrated out

of the remaining half weight and jammed on the top surface of the

elevator; as a result, the elevator spring tab was held in the

trailing-edge-down position.

The report said that the Dash 8 pitch-control system

comprises two elevator-control-cable circuits, each operating an

independently mounted, spring-tab-assisted elevator. Each

elevator has a spring tab at the inboard end and a trim tab at the

outboard end.

The left elevator is actuated by the captain's control

column through the left cable-control circuit and the left elevator

spring-tab system. The right elevator is actuated by the first

officer's control column through similar components.

The two control columns normally are interconnected to

allow for simultaneous movements of both elevators.

In the event that one of the controllable circuits jams, the

control columns can be disconnected by the elevator-pitchdisconnect

system to allow the unjammed circuit to operate

normally.

Spring tabs provide 'aerodynamic assistance'

The report said that the spring-tab system is designed

to provide aerodynamic assistance to elevator movement. There

are two mass balances extending forward of each spring-tab

leading edge. Each mass balance assembly consists of two

weights bolted together and secured to the arm with two bolts.

Flight Safety Foundation. In: Aviation Mechanics Bulletin (adapted).

According to the text, it can be inferred that

both control columns components look alike.