SKY899
Installation Manual
009-11900-001
Installation - Page 2-25
Revision F
July 18, 2013
2.9.3
Alternate Display Output
The TRC has one transmit channel designated for alternate displays (i.e., EFIS, MFD and weather radar
via a Radar Graphics Computer). The transmitter speed is fixed at 100 kHz. A maximum (typical) of ten
loads (displays) can be connected to the output channel. See Appendix A for signal characteristics.
Alternate Display connections:
A429TX1_A
P1-42
A429TX1_B
P1-43
2.9.4
Future Option
The TRC has one spare receiver A429RX8_A & A429RX8_B and one spare transmitter A429TX3_A &
A429TX3_B reserved for a future option. Do not connect these I/O channels.
2.10 AUDIO (ALERT) OUTPUT
Voice messages are output to the aircraft audio system, unless the audio inhibit input (from
GPWS/EGPWS/TAWS) is active. The audio output is delayed when a terrain warning system (flag)
alarm is detected and remains delayed until the warning clears.
Connect this output to an
unmuted
audio panel input.
Two outputs, 150 ohm and 600 ohm, can supply up to 40 mW to the audio distribution system. Volume
level is set via the Service Menu.
Audio output connections:
AUDIO_H
P1-89 (600 Ohm)
AUDIO_L
P1-90 (150 Ohm)
AUDIO_C
P1-91 (Audio Common)
2.11 BAROMETRIC (UNCORRECTED) ALTITUDE INPUTS
The TRC requires an uncorrected barometric altimeter input. The barometric altitude can be Gilham code
or ARINC-429 (air data computer (ADC)).
NOTES
1.
Only one uncorrected barometric altimeter input source, either
Gilham code or ARINC-429 should be connected.
2.
The uncorrected barometric altimeter input (Gilham code or ARINC-
429) should be from the same source that is interfaced with the
transponder or it must be at least as accurate as that source, i.e., ±
125 ft.
The document reference is online, please check the correspondence between the online documentation and the printed version.