SKY899
Installation Manual
009-11900-001
Installation - Page 2-27
Revision F
July 18, 2013
Synchro (XYZ) heading connections:
HEADING_X
P1-46 (Synchro X)
HEADING_Y
P1-47 (Synchro Y)
HEADING_Z
P1-48 (Synchro Z)
HEADING_H
P1-49 (26 V ac High)
HEADING_C
P1-50 (26 V ac Low)
HEADING_FLG
P1-51 (Heading Valid)
2.13.2 ARINC 429 (AHRS - Attitude Heading and Reference System)
AHRS provides aircraft attitude and heading values via the ARINC-429 bus. ARINC-429 receiver
channel speed can be 12.5 or 100 kHz. Refer to paragraph 2.9 and 2.9.1 for ARINC-429 general sensor
input information.
2.14 LAMP OUTPUTS (ABV AND BLW)
The lamp outputs are used only with an alternate display that is not capable of annunciating the vertical
display modes for above (ABV), below (BLW) and unrestricted (UNR). Outputs are switched to ground
when active. The lamps require a separate dc source (constant or dimming circuit). If lamp voltage is an
ac source then an isolation relay must be used. Refer to Appendix A for electrical characteristics.
Lamp connections:
LP1OUT
P1-66 (ABV)
LP2OUT
P1-85 (BLW)
Depending on the vertical display mode selected the appropriate annunciator(s) will light. If in normal
mode neither lamp will light, if in above mode the ABV lamp will light, if in below mode the BLW lamp
will light, and when unrestricted vertical mode is selected both lamps will light. See Figure 2-7.
Figure 2-7: Above and Below External Lamps
2.15 ON/OFF SWITCH
This input connection turns the system ON and OFF. Wiring of this input will vary depending upon your
specific installation. With pin P1-4 connected to P1-5 the system will turn on.
WX-1000/SKY497 Display (without WX-1000).
Connect per Figure 2-2.
Alternate Display
. A separate ON/OFF switch is required (any SPDT toggle switch rated at 1/2 A @ 28
V dc can be used). Reference the display manufactures instructions and Figure 2-4 for further details.
WX-1000 Override Switch (SW2).
See paragraph 2.24.2 and Figure 2-3.
ON/OFF connections:
ON/OFF
P1-4
ON/OFF_RET
P1-5
The document reference is online, please check the correspondence between the online documentation and the printed version.
