Garmin GTX 33 Installation Manual - Page 44

Altimeter Inputs, Altimeter Interconnect, Dual GTX 33 Installation, Altimeter Selection Priority

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4.4.1 Altimeter Inputs Pin Name ALTITUDE D4 ALTITUDE A1 ALTITUDE A2 ALTITUDE A4 ALTITUDE B1 ALTITUDE B2 ALTITUDE B4 ALTITUDE C1 ALTITUDE C2 ALTITUDE C4 ALTITUDE COMMON Table 4-4. Altimeter Inputs Connector Pin I/O P3301 11 In P3301 2 In P3301 4 In P3301 5 In P3301 7 In P3301 9 In P3301 10 In P3301 8 In P3301 3 In P3301 6 In P3301 50 -- 4.4.2 Altimeter Interconnect, Dual GTX 33 Installation For complete dual installation in which digital altitude encoders are connected to the GTX 33, it is best to install two digital sources, connecting one encoder to each transponder. 4.4.3 Altimeter Selection Priority When connecting the transponder to a GNS 480 (CNX80) or GTN 6XX/7XX the installer must be aware of the GTX 33 priority for selecting encoded altimeter interconnections. The GTX 33 searches in this sequence for altitude, and stops when it finds a valid pressure altitude input. Altitude reporting equipment order of precedence: 1. ARINC 429 Air Data Computer (label 203, if configured W/ALT) (25') 2. ARINC 429 EFIS (label 203, if configured W/ALT) (25') 3. RS-232 data from GNS 480 (CNX80), GTN 6XX/7XX, or Garmin Integrated Flight Deck (25') 4. RS-232 Fuel/Air Data Computer (if configured W/ALT.) (25') 5. Shadin Altitude Serializer/Encoder (if configured for 25') 6. Icarus Altitude Serializer/Encoder (if configured for 25') 7. Parallel wire Gray Code input (100') 8. Shadin Altitude Serializer/Encoder (if configured for 100') 9. Icarus Altitude Serializer/Encoder (if configured for 100') Only approved devices may provide altitude to the GTX 33 in accordance with 14 CFR 91.217. In addition, all altitude reporting devices installed in the aircraft must meet certification requirements of 14 CFR 91.413. The installer must select an altitude reporting device that is a certified altitude source for the particular aircraft. GTX 33 Installation Manual Page 4-6 190-00906-00 Rev. F

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GTX 33 Installation Manual
190-00906-00
Page 4-6
Rev. F
4.4.1
Altimeter Inputs
4.4.2
Altimeter Interconnect, Dual GTX 33 Installation
For complete dual installation in which digital altitude encoders are connected to the GTX 33, it is best to
install two digital sources, connecting one encoder to each transponder.
4.4.3
Altimeter Selection Priority
When connecting the transponder to a GNS 480 (CNX80) or GTN 6XX/7XX the installer must be aware
of the GTX 33 priority for selecting encoded altimeter interconnections. The GTX 33 searches in this
sequence for altitude, and stops when it finds a valid pressure altitude input.
Altitude reporting equipment order of precedence:
1.
ARINC 429 Air Data Computer (label 203, if configured W/ALT) (25’)
2.
ARINC 429 EFIS (label 203, if configured W/ALT) (25’)
3.
RS-232 data from GNS 480 (CNX80), GTN 6XX/7XX, or Garmin Integrated Flight Deck (25')
4.
RS-232 Fuel/Air Data Computer (if configured W/ALT.) (25’)
5.
Shadin Altitude Serializer/Encoder (if configured for 25’)
6.
Icarus Altitude Serializer/Encoder (if configured for 25’)
7.
Parallel wire Gray Code input (100’)
8.
Shadin Altitude Serializer/Encoder (if configured for 100’)
9.
Icarus Altitude Serializer/Encoder (if configured for 100’)
Only approved devices may provide altitude to the GTX 33 in accordance with 14 CFR 91.217. In
addition, all altitude reporting devices installed in the aircraft must meet certification requirements of
14 CFR 91.413. The installer must select an altitude reporting device that is a certified altitude source for
the particular aircraft.
Table 4-4.
Altimeter Inputs
Pin Name
Connector
Pin
I/O
ALTITUDE D4
P3301
11
In
ALTITUDE A1
P3301
2
In
ALTITUDE A2
P3301
4
In
ALTITUDE A4
P3301
5
In
ALTITUDE B1
P3301
7
In
ALTITUDE B2
P3301
9
In
ALTITUDE B4
P3301
10
In
ALTITUDE C1
P3301
8
In
ALTITUDE C2
P3301
3
In
ALTITUDE C4
P3301
6
In
ALTITUDE COMMON
P3301
50
--