Install Manual Part 3
Table Of Contents
- CHAPTER 4- MAINTENANCE
- APPENDIX A - SIGNAL & CABLE CHARACTERISTICS
- APPENDIX B - CHECKOUT USING TCAS-201 RAMP TEST SET
- APPENDIX C - CHECKOUT USING T-49C FLIGHTLINE TESTER
- APPENDIX D - USING THE TERMINAL DEVICE
- APPENDIX E - CHECKOUT USING ALTERNATE DISPLAY
SKY497
Installation Manual
A-5
Rev. C
SIGNAL CHARACTERISTICS
Horizontal Sync Balanced horizontal sync from the WX-1000 Processor (if installed) and
output to the WX-1000/SKY497 display. Signal levels as specified in
RS-422.
CONNECTION TRC P1-47 (HSYNC_IN_HI) From Processor
TRC P1-46 (HSYNC_IN_LO) From Processor
TRC P1-49 (HSYNC_OUT_HI) To Display
TRC P1-48 (HSYNC_OUT_LO) To Display
CABLE See paragraph 2.6.3.
VOLTAGE 0-5 V dc
CURRENT <100 mA
FREQUENCY 16.4 kHz
LOAD Z 1 kΩ
Landing Gear Switch Input This signal line is to be connected to the landing gear switch to sense the
position of the landing gear (see para 2.6.13).
IF THE AIRCRAFT DOES NOT HAVE A LANDING GEAR SWITCH, THIS INPUT MUST
REMAIN UNCONNECTED
.
With this configuration, if no ARINC 429 compatible
radio altimeter is installed, the system will default to the highest TA
sensitivity level (level B) and audio TA announcements (i.e., “traffic, traffic”)
will not be inhibited during takeoff and landing.
CONNECTION TRC P1-87 (GEAR)
CABLE Minimum 22 AWG wire for lengths up to 30 ft.
VOLTAGE GEAR UP Indication 4.5 - 32 V dc or OPEN
GEAR DOWN Indication, Aircraft Ground
CURRENT <5 mA sourced.
SOURCE Z >40 kΩ
MAX CAPACITANCE <20 pF
Normal/ Over-ride This is a WX-1000 Maintenance over-ride switch (see para 2.6.11). Over-
ride control (SW2 on the Interconnect Wiring Diagram, figure 2-3) is
necessary only if a WX-1000 processor is also installed. It enables the
SKY497 to be powered-up if the WX-1000 processor has been removed for
service. During normal operation, with a WX-1000 processor installed,
SW2 should remain in the WX-1000 position. Any general purpose DPDT
toggle switch can be used.
CONNECTION TRC P1-11 (PWR_SW_HI)
TRC P1-3 (PWR_SW_LO)
CABLE Minimun 22 AWG.
VOLTAGE Less than 0.7 V = ON; open = OFF.
CURRENT <100 mA
Power Input (TRC) 11-34 V dc. 7.5 A circuit breaker required for 14 V aircraft systems and a 5
A circuit breaker for 28V systems (see para 2.6.14).
CONNECTION
TRC J8-A (+28V)
TRC J8-B (+28V_RET)
CABLE Use twisted shielded pair cable (Beldon 83322,
Alpha 2826/2, or equivalent). Terminate shield to
airframe at sensor or power source.
VOLTAGE 11 to 34 V dc, 70 Watts (Maximum)