Controls and Indicators

TM 11-5840-270-24-1

1-8. Controls and Indicators

(fig. l-l. )

Control, indicator,

Function

or connector

Lights when aircraft passes over a marker beacon. Dc power is

Beacon lamp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

applied to light the lamp.

Mechanical iris varies brightness of beacon lamp when rotated.

Beacon lamp dimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lights beacon lamp when pressed, to test lamp.

PRESS-TO-TEST switch

Localizer (vertica) pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . Moves left and right of center to indicate that aircraft is off

course.

Appears in window to indicate unreliable signal or loss of

Localizer warning flag . . . . . . .. . . . . . . . . . . . . . . . . . . . . ..

adequate signal.

Glide path (horizontal) pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . Moves above or below center to indicate deviation from desired

glide path. (Aircraft is too high or too low).

Appears in window to indicate unreliable signal or loss of

Glide path warning flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

adequate signal.

Localizer pointer zero adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aligns localizer pointer over dots

Glide path pointer zero adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aligns glide path pointer over dots

1-3