A V I O N I C S L I M I T E D
3.3 OPERATING INSTRUCTIONS
3.3.1 INITIAL
TURN
ON
On initial activation, the frequency 112.50 MHz is tuned and displayed. The
three Marker lights, Localizer course and Glidepath deviation light bars will be
momentarily fully illuminated (when off frequency or out of reception range).
This self-test feature provides a visual display to confirm that all lamps are
operable.
3.3.2 ILS
MODE
When the test and visual inspection has been completed, select the desired
frequency with the “Freq. Select” toggle switches S1101 (MHz), S1102 (kHz)
for the frequency intended.
Glideslope UHF frequencies are not shown but are paired automatically to
the VHF Localizer frequency selected and displayed on the
INS 422
.
When within reception range of Localizer, Glideslope and Marker signals, the
course and glidepath indications displayed when in-bound on the “Front
Course” of the approach would be as follows:
•
A “single center lamp” displayed without any barring up-down or left-right
would indicate a centered on course and glidepath indication for both
Glidepath and Localizer.
•
A light bar deflection (string of lamps) to the right would indicate a left of
course condition and would require a turn “right” in the direction of the
light bar to adjust and correct course.
•
A light bar deflection (string of lamps) to the left would indicate a right of
course condition and would require a turn “left” in the direction of the light
bar to adjust and correct course.
•
A light bar deflection (string of lamps) toward the top “up” would indicate
a below glidepath condition and would require a climb “up” in the
direction of the light bar to adjust and correct glidepath.
•
A light bar deflection (string of lamps) toward the “bottom” would indicate
an above glidepath condition and would require a descent “down” in the
direction of the light bar to adjust and correct glidepath.
INS 422 Installation/Owners Manual
Original Issue – June 2001
VPN 701034
17
