Garmin Apollo CNX80 Installation Manual - page 33
Installation
Procedures
Apollo CNX80 Installation Manual
560-0982-00 Rev D
2-3
•
To take full advantage of the CNX80 capabilities an optional altitude source is recommended for
automatic sequencing of course-to-altitude (CA) and heading-to-altitude (VA) leg types. If no altitude
data is provided to the CNX80, CA and VA legs must be manually sequenced.
Without an external CDI, no glideslope information is obtainable. However, the unit will maintain full
VOR and Localizer functionality including an internal CDI display.
The installation must be placarded “GPS LIMITED TO VFR USE ONLY” in clear view of the pilot.
2.5.1.2 IFR VOR/LOC/GS Installation
The minimum CNX80 installation requires the following items for an IFR VOR/LOC/GS Installation:
•
CNX80 GPS/WAAS/Nav/Com (installed in the aircraft manufacturer approved location)
•
GPS antenna, Nav antenna and Com antenna.
•
External CDI/HSI indicator installed in the pilot’s primary field-of-view (or in the aircraft
manufacturer approved mounting location). This indicator must meet the following criteria:
1.
The course deviation needle shall have a full-scale deflection with a 150 mV deviation input.
2.
The valid flag shall be either a low-level input or superflag input.
3.
The TO/FROM flag shall be fully in view with a 250 mV input.
4.
The OBS resolver should be compatible with a standard 6-wire OBS interface:
H............ Reference output high
E..........S3 COS input low
C ............ Reference output low
F..........S4 SIN input high
D............ S1 COS input high
G .........S2 SIN input low
Any electrical zero crossing will work because the CNX80 will calibrate out any errors.
•
External non-numeric glideslope indicator installed in the pilot’s primary field-of-view. This indicator
must meet the following criteria:
1.
The glideslope deviation needle shall have a full-scale deflection with a 150 mV deviation input.
2.
The valid flag shall be either a low-level input or superflag input.
NOTE
Exact specifications for the external CDI/HSI and glideslope indicator interfaces are found
in 1.3.9 Avionics Interfaces.
•
CDI/HSI source selection annunciator (only required for some installations – refer to 2.5.3.2 for
additional information describing when a source selection annunciator is required).
•
To take full advantage of the CNX80 capabilities an optional altitude source is recommended for
automatic sequencing of course-to-altitude (CA) and heading-to-altitude (VA) leg types. If no altitude
data is provided to the CNX80, CA and VA legs must be manually sequenced.
2.5.1.3 IFR GPS Installation
In order for the CNX80 to be utilized for IFR GPS Navigation, the criteria in 2.5.1.2 must be met
and
the
CNX80 must be mounted within the acceptable field-of-view. Refer to 2.5.3.1 for determining whether or
not the CNX80 is located within the acceptable field-of-view.
In certain instances, aircraft on the Approved Model List have a center radio stack located outside of the
acceptable field-of-view. These installations may only be approved for IFR operations under the AML if the
location has been previously approved by the FAA (ACO). Refer to Appendix E for a list of aircraft that do