Bendix/King
KMA28
Audio Amplifier/Intercom/Marker Beacon Receiver
2.9KMA 28 Pin Assignments
Chassis Ground
MKR Coax Lo
MMSense Output MKR Antenna
Pilot Headphones 
White Lamp Output 
Amber Lamp Out 
14 V Light Hi
Blue Lamp Out 
Light Lo
DME Audio Hi
28V Lights Hi
Com 2 Mic Audio Out 
Pilot Mic Audio Hi In
Com 3 Audio Hi
Com 1 Audio Hi
Com 3 Mic Audio Out
Com 2 Audio Hi
Com 1 Spkr Load
AUX Audio Input Hi
Com 2 SPKR Load Nav 1 Audio Hi
Cellphone tip Nav 2 Audio Hi
Com 1 Mic Audio Out 
Cellphone ring
Com 1 Mic Key 
Com 3 Mic Key 
ADF Audio Hi Com 2 SPKR load
Unswitched Audio In #1 Unswitched Audio In #2
PA Mute 
Com 2 Mic Key
Com 1 SPKR load 
Cabin Spkr Out 
Aircraft Power
Ext. Marker Audio In
Pilot Mic Key
Cabin Spkr Lo
Aircraft Ground
J1 Bottom Connector
1 
A 2 
B 3 C 4 
D 5 
E 
6 
F 7 H 
8 
J 
9 K 
10 
L 
11 
M 
12 
N 
13 P 
14 R 15 
S 16 
T 
17 U 18 V 19 W 
20 X 
21 
Y 22 Z
J2 Top Connector
1
Pilot Phone Audio Hi (Left)
A
AUX Control Out
2
Copilot Phone Audio (Lt)
B
Copilot Phone Audio Lo
3
Copilot Phone Audio (Rt)
C | Pass 1 Mic Audio Hi | ||
4 | |||
D | Pass 1 Mic Audio Lo | ||
Pass 2 Mic Audio Hi | |||
5 | |||
E | Pass 2 Mic Audio Lo | ||
6 | Pass 3 | Mic Audio Hi | |
F | Pass 3 | Mic Audio Lo | |
7 | Pass 4 | Mic Audio Hi | |
H | Pass 4 | Mic Audio Lo | |
8 | Copilot Mic Audio Hi | ||
J | Copilot Mic Key | ||
9 | |||
K
Copilot Mic Audio Lo
10 | Swap Switch |
L
Copilot Cellphone Off Hook
11
Passenger Headphone Audio (R)
M |
| Pass Cellphone Off Hook |
12 |
| Passenger Headphone Audio (L) |
|
N
Passenger Headphone Audio Lo
13
Entertainment #2 In (R)
P |
| Entertainment #2 In (L) |
14 |
| |
| ||
R |
| Entertainment # 2 Lo |
15 |
| Entertainment #1 In (R) |
S |
| Entertainment #1 In (L) |
16 |
|
T
Entertainment #1 Lo
17 |
| Ground |
U |
| IntelliVOX Over ride |
18 |
| PA Activate |
V |
| Ent 2 Mute |
19 |
| Reserved |
W |
| Reserved |
| ||
20 |
| Reserved |
| ||
X |
| Reserved |
21 |
| Reserved |
Y |
| Reserved |
22 |
| Reserved |
Z
Reserved
Page | Rev. 0, Sept. 2000 |