PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010
Appendix C
Rev. 29, Sept. 2021
7.3 Dual PAC24intercom audio wiring with Observer Configuration (050-240-0400 only) and expansion units
Pil ot PTT
19
Z
Pilot Phones Lo
Pilot Phones
D
Speaker Lo
Cockpit Speaker Hi
4
1
B
Pilot Mic Lo
Pilot Mic PT T
Pilot Mic Audio Hi
X
20
b
Copilot Phones Lo
Copilot Phones Hi
11-33 VDC
24
c
Audi o Low
PA Speaker Hi
Speaker Lo
Airframe Ground
A
2A
V
V
SCL
Music Low
Music In
7
Swap
Switch
2
23
22
24
11-33 VDC
c
Airf rame Ground
A
Music Low
Music In
7
CVR Output
2
22
23
25
25
Obser ver Phones Lo
Obser ver Phones
D
Speaker Lo
Local Speaker Hi
Y
Y
SDA
18
14 V dimmer/Swap (Notes 12, 16)
U
28 V dimmer/Swap (Notes 12, 16)
8
PA Mute (Note 8)
Obser ver
CVR Output
11
Pilot ICS key
4
1
Pilot-Copilot
b
Pass ICS in
19
Z
Obser ver Mic Lo
Obser ver Mic PT T
Obser ver Mic Audio Hi
17
Backlight Lo
Copilot Mic PT T
Copilot Mic Audio Hi
Copi lot PTT
Swap
Switch
18
14 V dimmer/Swap (Notes 12 & 16)
U
28 V dimmer/Swap (Notes 12 & 16)
8
PA Mute (Note 8)
17
Backli ght Low
Speaker Lo
PA Speaker Hi
B
W
ICS Key Enable
M
Copilot ICS key
11
W
Observer I CS key
ICS key enabl e
1. Al l wi ring mus t c onf orm t o MIL 22750 or 27500.
2. Al l s hields s hould be grounded at audi o panel only,
other end remains fl oati ng.
3. Al l phone and mic j ac ks mus t be floating from ground.
4. Speaker l ow mus t be connec ted as shown,
and not to other audio low.
5. For expans ion unit , us e part number 11606 or 11606R only.
6. Pi ns V, Y, and 24 are used t o connec t in dual sys tems .
7. Pi ns M, W, and 11 are us e in c ases where a
Pus h-to-t al k i nterc om is desi red. (Sec ti on 2.4.12.1)
8. PA Mute is T T L Level logic l ow when trans mit PT T is ac tive.
9. For mus ic dis t ribution inf ormat ion, s ee Sec ti on 2. 4. 13
10 All wiring must be #24 AWG or larger, unl es s otherwis e not ed.
11. Power and Ground to be #18 AW G or l arger.
For best res ults , power and ground wires s houl d be t wis ted
together for great er noi s e immunity.
12. See Sec ti on 2. 3. 2 for detail s on dual mode pins selec ted through DI P.
13. I n T EL Mode, COM 5 Mi c audio s houl d be c onnec ted to both audio panel s.
Obs erver audio wi ll be rout ed t hrough pilots panel to phone.
Leave PT T open t o COM 5 if not required for duplex operati on.
14. Pin 2 i s out put to CVR
15. For pass engers , us e Int el liPAX expansi on unit .
T o use expans ion unit (p/ n 11606), c onnec t 23, 23, and a as shown in t he expansi on
i nst al lation manual.
16. For 14V aircraf t, c onnec t 18 to dimmer, and us e u as the s wap i nput.
For 28 V ai rc raft, c onnect u t o di mmer, and use 18 as s wap i nput.
I nternal DIP swit c hes mus t be s et c orrec tly.
17. DME not c onnect ed in -0500, -0503.
18. T he pas s enger and cros s t ie interf ac e
I S NOT IDENT ICAL to a st andard dual ins tallati on.
19. Do not connec t s peakers to more than one out put. See sec ti on 2.4.11
20. T he radio audi o to t he expansi on unit is provided only by the audio panel
c onnec ted. For example, the expans ion unit connec ted to t he c opilot audio
panel wil l ONLY rec ei ve audio s el ec t ed by the c opil ot. See Sec t. 2. 4. 14.
Note 7
Note 20
IntelliPAX Expansion Unit
PN 11606
15
2
14
Expansion Input
Expansion Out put
3
PAC24 CREW Configuration Unit
050-240-0400 ONLY
PAC24 Observer Configuratio Unit
050-240-0400 ONLY
+ 9V DC Expansion Power
1
a
See 11606 manual
diagram for more informat ion
Expansion Ground
NOTE 18
Dual Installation Notes
Not es 4 & 19
Not es 4 & 19
Obser ver
Pilot-Copilot
D
UAL
PAC24
A
UDIO
W
IRING
,
O
BSERVER
C
ONFIGURATION
U
NITS
WITH
EXPANSION
(050-240-0400
ONLY)