Garmin GNC 420AW Installation Manual - page 63
400W Series Installation Manual
Page 4-5
190-00356-02
Rev. E
4.2
Power, Lighting, and Antennas
This section covers the power input requirements, lighting bus input, and antenna connections. See
Figure H-5 for interconnect information.
4.2.1 Power
Pin Name
Connector
Pin
I/O
AIRCRAFT POWER 1 (MAIN)
P4001
19
In
AIRCRAFT POWER 1 (MAIN)
P4001
20
In
AIRCRAFT POWER 2 (MAIN)
P4001
15
In
AIRCRAFT POWER 2 (MAIN)
P4001
72
In
AIRCRAFT POWER (COM)
P4002
11
In
AIRCRAFT POWER (COM)
P4002
12
In
AIRCRAFT POWER (NAV SUPERFLAG)
P4006
44
In
AIRCRAFT GROUND
P4001
77
--
AIRCRAFT GROUND
P4001
78
--
AIRCRAFT GROUND
P4002
21
--
AIRCRAFT GROUND
P4002
22
--
AIRCRAFT GROUND
P4006
41
--
CAUTION
To operate the COM transceiver in a 14 volt aircraft with a GNC 420AW, GNS 430AW
or the 28 VDC upgrade units, (see Table 3-1), a 14 to 28 volt converter such as KGS
Electronics model RB-126 or UC-14-28 or equivalent must be used. The voltage
converter should include a single short circuit protection device on its output, such as a
circuit breaker. The output should be connected to the COM power input, P4002-11 and
P4002-12 for the COM transmitter. The other power input pins (P4001-19, -20, -15, -72
and P4006-44) accept 11 to 33 VDC. Refer to Figure H-5.
A power connection on P4006-44 is only required if NAV SUPERFLAG and/or G/S SUPERFLAG is
utilized.
The power inputs P4001-19 and -20 provide power for all functions of the 400W Series unit except the
COM transmitter and the NAV & G/S SUPERFLAG outputs.
4.2.2 Lighting
Bus
Pin Name
Connector
Pin
I/O
LIGHTING BUS HI
P4001
39
In
LIGHTING BUS LO
P4001
40
In
The 400W Series unit can be configured to track 28 VDC, 14 VDC, 5 VDC or 5 Vac lighting buses using
these inputs. Alternatively, the 400W Series unit can automatically adjust for ambient lighting
conditions based on the photocell. Refer to Section 5.3.7 for configuring lighting inputs.
4.2.3 Antennas
Pin Name
Connector
I/O
GPS ANTENNA
P4003
In
COM ANTENNA
P4004
I/O
VOR/LOC ANTENNA
P4005
In
GLIDESLOPE ANTENNA
P4007
In