Installation
Procedures
Apollo CNX80 Installation Manual
560-0982-00 Rev D
2-5
If multiple sources of heading data are supplied to the CNX80, only valid data from the highest priority
source is used (input priority cannot be configured). If the highest priority source becomes unavailable,
data is taken from the next-highest priority source. The priorities of the heading sources are as follows
(from highest to lowest):
1.
ARINC 429 Heading Source
2.
FADC
3.
XYZ Synchro
2.5.2.3 Multiple Baro Correction Sources
The CNX80 can accept barometric correction from an altimeter with a baro correction potentiometer
output, ARINC 429 ADC, FADC, MX20 display or another CNX80.
If multiple sources of barometric correction data are supplied to the CNX80, only valid data from the
highest priority source is used. If the highest priority source becomes unavailable, data is taken from the
next-highest priority source. The priorities of the barometric correction sources are as follows (from highest
to lowest):
1.
Baro correction potentiometer (from altimeter)
2.
FADC (use of the baro correction and baro-corrected altitude can be disabled as part of the setup)
3.
ADC (correction derived from ARINC 429 labels 203 and 204)
4.
MX20 Display
5.
Manual entry into CNX80 (allowed only if no other baro correction sources are available)
NOTE
Baro correction data received from a second CNX80 will also be derived from one of the
above sources. Data received on the CNX80 cross-talk input is treated as if it is received
directly from the source that is supplying baro correction to the second CNX80. If the
direct input and the CNX80 cross-talk input have the same priority, data from the direct
input is used.
2.5.3 M
OUNTING
C
ONSIDERATIONS
The CNX80 is designed to mount in the avionics stack in the aircraft instrument panel within view and
reach of the pilot. The preferred location would minimize pilot head movement when transitioning between
looking outside of the cockpit and viewing / operating the CNX80. The location should be such that the
CNX80 is not blocked by the glareshield on top, or by the throttles, control yoke, etc. on the bottom.
For VFR-only installations, the CNX80 must be mounted in the aircraft manufacturer approved location or
other FAA approved location.
For IFR GPS installations, the CNX80 must be mounted within the acceptable field-of-view, as defined in
2.5.3.1. If the CNX80 cannot be mounted within the acceptable field-of-view this does not preclude IFR
GPS operation, but additional FAA approval may be required.
To preclude the requirement for an external CDI/HSI source selection annunciation in IFR installations, the
CNX80 must be located in close proximity to the main (switched) CDI/HSI, as defined in 2.5.3.2. If the
CNX80 cannot be within the required distance of the CDI/HSI, then a CDI/HSI source selection
annunciator must be provided (a CDI/HSI with a built-in annunciation may also be used in lieu of a
separate external annunciator to satisfy the annunciation requirement).
Summary of Contents for Apollo CNX80
Page 1: ...Apollo CNX80 Installation Manual September 2003 560 0982 00 Rev D...
Page 10: ...Table of Contents viii 560 0982 00 Rev D Apollo CNX80 Installation Manual NOTES...
Page 30: ...General Information 1 20 560 0982 00 Rev D Apollo CNX80 Installation Manual NOTES...
Page 114: ...Periodic Maintenance 6 2 560 0982 00 Rev D Apollo CNX80 Installation Manual NOTES...
Page 134: ...Appendix D Interconnect Diagrams D 2 560 0982 00 Rev D Apollo CNX80 Installation Manual NOTES...
Page 167: ......
Page 168: ......
