JA31-N01 Intercom Bus Selector - NVG
Installation and Operating Manual
Rev A
Page 5
Unless otherwise noted, all wiring shall be a minimum of 24 AWG, except ground lines, which shall be a minimum of
22 AWG. Refer to the Interconnect drawing for additional specifications. Check that the ground connection is clean
and well secured, and that it shares no path with any electrically noisy aircraft accessories such as blowers, turn-and-
bank instruments, or similar loads.
2.4.3
Mechanical Installation
The JA31-N01 can be mounted in any attitude and location with adequate space for the front panel and sufficient
clearance for the connector and wiring harness. It requires no direct cooling.
2.4.4
Legend Replacement
The JA31-N01 illuminated legends are field replaceable. For further information, refer to the
‘Legend Replacement’
document in Appendix A of this manual.
2.4.5
Post Installation Checks
2.4.5.1
Voltage/Resistance checks.
Do not attach this unit until the following conditions are met:
a) Check P1 pin
2
for +28 Vdc lights bus voltage.
b) Check P2 pin
14
for continuity to ground (less than 0.5
Ω).
c)
Check all pins for shorts to ground or adjacent pins.
2.4.5.3
Power on Checks.
P
ower up the aircraft’s systems and confirm normal operation of all functions of the JA31-N01. Refer to
Section 3 (Operation) for specific operational details.
a) With all switches in the BUS 1 position, confirm each USER can communicate to all other USERs on the
intercom tie lines.
b) With the USER 1 switch to BUS 2 and all other switches on BUS 1, confirm that USER 1 cannot hear the
other USERs. Confirm that the other USERs cannot hear USER 1. Repeat for each USER.
c)
Adjust the lighting bus from minimum to maximum. Confirm that the JA31 legend illumination changes from
dim to bright.
When all performance checks are satisfied, complete the necessary regulatory documentation before releasing the
aircraft for service. Refer to
Appendix B.
