Installation Procedures
GNS 480 (CNX80) Installation Manual
560-0982-01 Rev L
2-7
2.5.3.2
CDI/HSI Source Selection Annunciator
The GNS 480 has the capability to switch between its internal VOR/ILS receiver and GPS receiver when
driving a CDI/HSI. If the GNS 480 cannot be mounted such that the on-screen CDI/HSI source selection
annunciation is entirely within the acceptable area shown in Figure 2-2, a CDI/HSI Source Selection
Annunciator will be required to annunciate which source is presently driving the switched CDI/HSI. This
annunciator MUST have illuminated NAV and GPS annunciations (i.e. the GPS and NAV text must be
illuminated). The preferred location for this annunciator is on the same side of the switched CDI/HSI as
the GNS 480. A CDI/HSI with a built-in NAV/GPS annunciation may also be used in lieu of a separate
external annunciator to satisfy the annunciation requirement.
2 in
1 in
GNS 480
ON-SCREEN CDI/HSI
SOURCE SELECTION
ANNUNCIATION
(0.5" x 0.2")
4
Location of
GNS 480 on-screen
CDI/HSI Source
Selection
Annunciation
Bottom edge of GNS
480 must be within this
area to use the GNS
480 internal source
annunciation.
Pilot's Instrument 'T'
Instrument 'T' Centerline
13 in
Glareshield
1
NOTES:
1. FOR AIRCRAFT WITHOUT THE BASIC INSTRUMENT 'T' CONFIGURATION, THE CENTER OF THE PILOT'S YOKE
SHOULD BE USED TO DETERMINE THE CENTERLINE.
2. FOR AIRCRAFT WITHOUT THE BASIC INSTRUMENT 'T' CONFIGURATION, THE LOWER LIMIT OF THE
ACCEPTABLE ANNUNCIATION AREA SHOULD BE 3.25 INCHES BELOW THE BOTTOM OF THE LOWEST
INSTRUMENT TYPICALLY FOUND IN THE BASIC 'T'.
3. FOR AIRCRAFT IN WHICH THE TYPE CERTIFICATED CDI OR HSI LOCATION IS BELOW THE BASIC 'T', THE LOWER
LIMIT OF THE ACCEPTABLE ANNUNCIATION AREA SHOULD BE THE BOTTOM OF THE CDI OR HSI.
4. IF THE ENTIRE GNS 480 ON-SCREEN CDI SOURCE SELECTION ANNUNCIATION IS WITHIN THE ACCEPTABLE
AREA, AN EXTERNAL CDI/HSI SOURCE SELECTION ANNUNCIATOR IS NOT REQUIRED.
5. IF THE GNS 480 CANNOT BE INSTALLED TO PRECLUDE USE OF AN EXTERNAL CDI/HSI SOURCE SELECTION
ANNUNCIATOR, AN EXTERNAL SOURCE SELECTION ANNUNCIATOR MUST BE INSTALLED WITHIN THE
ACCEPTABLE AREA SHOWN ABOVE. THIS ANNUNCIATOR MUST BE COMPLETELY CONTAINED IN THE
ACCEPTABLE AREA.
2
3
11 in
6.5 in
3.25 in
lower limit
upper limit
ACCEPTABLE AREA FOR
CDI/HSI SOURCE SELECT
ANNUNCIATION
5
4
Figure 2-2. Acceptable CDI/HSI Source Selection Annunciation Area
Summary of Contents for GNS 480
Page 1: ...GNS 480 CNX80 Color GPS NAV COM Installation Manual November 2008 560 0982 01 Rev L...
Page 10: ...Table of Contents viii 560 0982 01 Rev L GNS 480 CNX80 Installation Manual Notes...
Page 32: ...General Information 1 22 560 0982 01 Rev L GNS 480 CNX80 Installation Manual Notes...
Page 80: ...Installation Procedures 2 48 560 0982 01 Rev L GNS 480 CNX80 Installation Manual Notes...
Page 134: ...Periodic Maintenance 6 2 560 0982 01 Rev L GNS 480 CNX80 Installation Manual Notes...
Page 158: ...Appendix D Interconnect Diagrams D 2 560 0982 01 Rev L GNS 480 CNX80 Installation Manual Notes...
Page 192: ...D 36 560 0982 01 Rev Notes...
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