HSI

UJPT, E2-C2, ADV, & IUT RIFP-01

Introduction to Radio Instruments

Sg 11, fr 8

009 5

360

COURSE

RANGE

NAV

GS

Pointer

HDG

CRS

CDI

(LOCALIZER)

HSI

2.

HSI

a.

HSI uses acquisition flag marked “NAV”

b.

Bearing pointer No. 1 located at three o’clock (right wing)

NOTE: Acquisition of the localizer will place the NAV flag

out of view.

c.

CDI displays deviation left or right of centerline; each dot

represents 1-1/4 degree deviation (responds 4X as

sensitive)

NOTE: When the localizer information becomes invalid,

the HSI course deviation indicator centers and a red flag,

marked NAV, comes into view.

d.

GS pointer displays deviation above or below glidepath

NOTE: When glideslope information becomes invalid, the

GS pointer will freeze at a random position.

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