Install Manual

Preliminary
SKY899
Installation Manual
2-24
Rev. A
2.9.3 Alternate Display Output
The TRC has one transmit channel designated for alternate displays (i.e., EFIS, MFD and weather radar
via RGC250). The transmitter speed is fixed at 100 kHz. The display driver must be selected via the
service menu. The display drivers control the ranges and information that will be presented on the
alternate display. The drivers are listed in table 2-1 along with their specifications.
NOTE
When an alternate display is selected via the service menu the alternate
display is the master display and the WX-1000/SKY497 display is the slave
(i.e., display range settings are controlled by the alternate display driver).
Alternate Display connections:
A429TX1_A (P1-42)
A429TX1_B (P1-43)
Table 2-1. Alternate Display Drivers
DISPLAY DRIVER NAME
DISPLAY
RANGES
STANDBY
RANGE
SELF-TEST
RANGE
REMARKS
None - - - No alternate display connected must use WX-
1000/SKY497 display.
Standard Type 1 2, 6, 15 nmi 15 nmi 6 nmi
Standard Type 2 6, 12, 20 nmi 12 nmi 6 nmi
Standard Type 3 5, 10, 20 nmi 10 nmi 5 nmi
Sextant Type 1 6, 12, 24 nmi 12 nmi 6 nmi Displays unrestricted mode, must use external lamps to
annunciate UNR mode.
Sextant Type 2 6, 12, 24 nmi 12 nmi 6 nmi Does not display unrestricted mode
Sextant CG 6, 12, 24 nmi 6 nmi 6 nmi Does not display unrestricted mode
Forestry Serv 2, 5, 10, 20 nmi 10 nmi 5 nmi
Collins EFIS Type 1 5, 10, 25 nmi 10 nmi 5 nmi Sends only 8 most threatening intruders to display.
EFIS changes ranges internally.
2.9.4 Future Option
The TRC has one spare receiver A429RX8_A (P1-81) & A429RX8_B (P1-82) and one spare transmitter
A429TX3_A (P1-52) & A429TX3_B (P1-53) 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) is
active. The audio output is disabled when a terrain warning system (GPWS) alarm is detected and
remains disabled until the warning clears.
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)