Multiple Baro-Corrected Altitude Sources; Multiple Heading Sources - Garmin GPS 400W Installation Manual

2.3.2

Multiple Baro-Corrected Altitude Sources

The 400W Series can accept baro-corrected altitude from an ARINC 429 ADC, ARINC 429 EFIS,
RS-232 FADC, and GTX 33/330 transponder.
If multiple sources of baro-corrected altitude data are supplied to the 400W Series unit, 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 baro-corrected altitude sources are as follows
(from highest to lowest):
1. ARINC 429 ADC
2. ARINC 429 EFIS
3. ARINC 429 from GTX 33/330
4. RS-232 FADC
2.3.3

Multiple Heading Sources

The 400W Series can accept heading data from an ARINC 429 INS/IRU, ARINC 429 EFIS, GAD 42,
EHSI, GTX 33/330 transponder, ARINC 429 traffic advisory system, RS-232 FADC, and RS-232
WX-500 Stormscope.
If multiple sources of heading data are supplied to the 400W Series unit, only valid data from the highest
priority source is used – preference is given to true heading (ARINC 429 label 314) if both true heading
(label 314) and magnetic heading (label 320) are received. 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 INS/IRU
2. ARINC 429 EFIS
3. ARINC 429 from GAD 42
4. ARINC 429 from Sandel EHSI
5. ARINC 429 from GTX 33/330
6. ARINC 429 traffic advisory system
7. RS-232 FADC
8. RS-232 WX-500 Stormscope
GNS 400W Series Installation Manual
190-00356-08
Page 2-3
Rev. G