PS Engineering PAC24 Installation Manual
9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
PAC24
Audio Control Panel and Intercom System
Installation
and
Operation Manual
FAA-Approved TSO C50c
JAA-Approved JTSO C50c
Document P/N 200-240-0010
Revision 24, Dec. 2013
PS Engineering, Inc. 2013 ©
Copyright Notice
Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written permission of PS Engineering, Inc. is strictly prohibited. For further information contact the Publications Manager at PS Engineering, Inc., 9800 Martel Road,
Lenoir City, TN 37772. Phone (865) 988-9800, email info@ps-engineering.com.
In certified aircraft, warranty is not valid unless this product is installed by an
Authorized PS Engineering dealer.
Table of Contents
SECTION I GENERAL INFORMATION................................................................................................... 1-1
1.1 INTRODUCTION..................................................................................................................................... 1-1
1.2 SCOPE ...................................................................................................................................................... 1-1
1.3 EQUIPMENT DESCRIPTION ................................................................................................................ 1-1
1.4 APPROVAL BASIS - ................................................................................................................................ 1-2
1.5 SPECIFICATIONS .................................................................................................................................. 1-2
1.6 EQUIPMENT SUPPLIED........................................................................................................................ 1-3
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED ................................................................................. 1-4
1.8 LICENSE REQUIREMENTS................................................................................................................... 1-4
SECTION II - INSTALLATION.................................................................................................................. 2-1
2.1 GENERAL INFORMATION ................................................................................................................... 2-1
2.1.1 SCOPE.................................................................................................................................................... 2-1
2.2 UNPACKING AND PRELIMINARY INSPECTION ................................................................................................ 2-1
2.3 EQUIPMENT INSTALLATION PROCEDURES..................................................................................................... 2-1
2.3.1 COOLING REQUIREMENTS .......................................................................................................................... 2-1
2.3.2 INTERNAL DIP SWITCH CONFIGURATION ..................................................................................................... 2-1
2.3.3 DIP SWITCH CROSS REFERENCE.................................................................................................................. 2-6
2.3.4 MOUNTING REQUIREMENTS ....................................................................................................................... 2-8
2.3.5 MOUNTING RACK INSTALLATION ................................................................................................................ 2-8
2.3.6 TRAY AND CONNECTOR ASSEMBLY............................................................................................................. 2-8
2.4 CABLE HARNESS WIRING ............................................................................................................................ 2-8
2.4.1 NOISE ...................................................................................................................................................... 2-8
2.4.2 EXISTING KMA 24H INSTALLATION ........................................................................................................... 2-9
2.4.3 POWER..................................................................................................................................................... 2-9
2.4.4 COMMUNICATIONS PUSH-TO-TALK (SINGLE PANEL INSTALLATION) ................................................................ 2-9
2.4.5 AUDIO PANEL INTERFACE ........................................................................................................................ 2-10
2.4.6 TRANSMIT INTERLOCK............................................................................................................................. 2-10
2.4.7 "SWAP" MODE ........................................................................................................................................ 2-10
2.4.8 BACKLIGHTING ....................................................................................................................................... 2-10
2.4.9 UNSWITCHED INPUTS............................................................................................................................... 2-10
2.4.10 PA MUTE (J3, PIN 8) ............................................................................................................................ 2-10
2.4.11 PUBLIC ADDRESS (J3, PIN B) ................................................................................................................. 2-10
2.4.12 INTERCOM WIRING ................................................................................................................................ 2-11
2.4.13 ENTERTAINMENT INPUT (J3 PIN 7) ......................................................................................................... 2-11
2.4.14 INTERCOM EXPANSION........................................................................................................................... 2-11
2.4.15 CVR OUTPUT/PLAYBACK BUTTON INSTALLATION (PIN 2- OPTION 1 UNITS ONLY)....................................... 2-12
2.5 ADJUSTMENTS........................................................................................................................................... 2-12
2.6 COMMUNICATIONS ANTENNA INSTALLATION NOTES ................................................................................... 2-13
2.7 TELECOMMUNICATIONS INTERFACE........................................................................................................... 2-13
2.8 PAC24 PIN ASSIGNMENTS.......................................................................................................................... 2-15
2.9 POST INSTALLATION CHECKOUT................................................................................................................ 2-16
2.10 UNIT INSTALLATION ................................................................................................................................ 2-16
2.10.1 OPERATIONAL CHECKOUT...................................................................................................................... 2-16
2.11 INTERNAL RECORDER CHECKOUT (OPTIONAL UNITS ONLY, -0200 AND -0400) .......................................... 2-17
2.12 FINAL INSPECTION .................................................................................................................................. 2-17
SECTION III OPERATION......................................................................................................................... 3-1
3.1 SCOPE ...................................................................................................................................................... 3-1
3.2 PAC24 CONTROLS ..................................................................................................................................... 3-1
3.3 POWER SWITCH (3) (EMG-FAIL SAFE OPERATION) ..................................................................................... 3-1
3.3.1 SINGLE PANEL FAIL SAFE OPERATION......................................................................................................... 3-1
3.3.2 DUAL PANEL FAIL SAFE OPERATION ........................................................................................................... 3-2
3.4 COMMUNICATIONS SELECTION (2) ............................................................................................................... 3-2
3.4.1 TELEPHONE OPERATION............................................................................................................................. 3-2
3.4.2 STUCK MICROPHONE PROTECTION.............................................................................................................. 3-2
3.4.3 SWAP MODE (REMOTE TRANSFER OF COM TRANSCEIVERS) ............................................................................ 3-2
3.4.4 OBSERVER TRANSMIT SELECTION (PART NUMBER –0400 SERIES). .................................................................. 3-2
3.5 RECEIVE AUDIO SELECTOR (1) .................................................................................................................... 3-3
3.5.1 SPEAKER AMPLIFIER (4) ............................................................................................................................ 3-3
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page ii Rev. 24, Dec. 2013
3.5.2 KEY “CLICK” ........................................................................................................................................... 3-3
3.6 SPLIT MODE................................................................................................................................................ 3-3
3.6.1 SPLIT MODE, SINGLE PANEL....................................................................................................................... 3-3
3.6.2 SPLIT MODE, DUAL PANEL ........................................................................................................................ 3-4
3.6.3 SPLIT MODE, OBSERVER PANEL (-04XX).................................................................................................... 3-4
3.7 INTERCOM OPERATION ............................................................................................................................... 3-4
3.7.1 INTELLIVOX® VOX-SQUELCH.................................................................................................................... 3-4
3.7.2 VOLUME CONTROL (3) .............................................................................................................................. 3-5
3.7.3 INTERCOM MODES (5) ............................................................................................................................... 3-5
3.7.4 ENTERTAINMENT INPUT............................................................................................................................. 3-6
3.8 TELEPHONE MODE...................................................................................................................................... 3-6
3.9 INTERNAL RECORDER SYSTEM (OPTION 1 UNITS ONLY)............................................................................... 3-7
3.9.1 OPERATION .............................................................................................................................................. 3-7
3.9.2 CONCURRENT MESSAGES........................................................................................................................... 3-7
SECTION IV- WARRANTY AND SERVICE ............................................................................................. 4-1
4.1 WARRANTY................................................................................................................................................. 4-1
4.2 FACTORY SERVICE ...................................................................................................................................... 4-1
APPENDIX A – INSTALLATION DRAWING..............................................................................................A
APPENDIX B SINGLE INTERCONNECT WIRING (DOES NOT APPLY TO 050-240-0400, -0401) .......A
APPENDIX B DUAL INTERCONNECT RADIO WIRING (ALL UNITS)..................................................B
7.1 DUAL PAC24 CREW AUDIO WIRING, STANDARD (-0100) UNITS ONLY..............................................................C
7.2 DUAL PAC24INTERCOM AUDIO WIRING WITH OBSERVER CONFIGURATION UNITS (050-240-0400, -0401 ONLY)
D
7.3 DUAL PAC24INTERCOM AUDIO WIRING WITH OBSERVER CONFIGURATION (050-240-0400, -0401 ONLY) AND
EXPANSION UNITS ...................................................................................................................................................... E
APPENDIX C- INSTRUCTIONS FOR FAA FORM 337 AND CONTINUING AIRWORTHINESS..........A
8.1 INSTRUCTIONS FOR FAA FORM 337, AUDIO PANELS.......................................................................................A
8.2 INSTRUCTIONS FOR CONTINUING AIRWORTHINESS, AUDIO PANELS ..................................................................A
APPENDIX D – RTCA DO160D (EUROCAE ED-14) ENVIRONMENTAL QUALIFICATION FORM ...A
APPENDIX F, EXTERNAL PTT HOOK UP.................................................................................................A
Rev Date Change
9 March 2005 Clarified Expansion Grounding, also pin out diagram on 2-11
10 March 2006 Added cross reference tables for DIP switch settings 2.3.2
11 January 2007 Added Vertical Orientation Units
12 May 2007 Clarified DIP switches, Section 2.3
13 September 2007 Added Appendix F, P-T-T- Modifications
14 August 2008 Added information on DIP Access & Observer minimum
15 September 2008 Clarified PA Speaker configuration
16 October 2008 Corrected expansion unit part number
17 March 2009 Added information on hot mic mode disable, §3.7.4.2
18 April 2009 Corrected drawing notes
19 May 2008 Added Special Mission –0503 units
20 Oct 2009 Regenerated wiring diagrams for improved resolution
21 March 2010 Clarified Expansion wiring & DIP switch setting
22 August 2011 Corrected Installation Kit P/N §1.6
23 April 2013 Added notes on unswitched audio §2.4.9 & §2.4.14
24 December 2013 Corrected text for Crew mode in §3.7.3.2
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 1-1 Rev. 24, Dec. 2013
Section I GENERAL INFORMATION
1.1 INTRODUCTION
The PAC24 represents the finest in high-performance cockpit audio control and intercommunications.
Using proprietary IntelliVox® design, this unit eliminates the requirements for intercom squelch adjustments. The unit is designed for outstanding ergonomics and visually defined mode annunciation and selection.
The PAC24 was designed to be a dual audio panel, offering convenience and utility for two-pilot crews, in
installations where a single panel is not practical.
The PAC24 –0500 is available where a vertical orientation would be appropriate.
Before installing and/or using this product, please read this manual completely. This will ensure that you
will take full advantage of all the advanced features in the PAC24.
1.2 SCOPE
This manual provides detailed installation and operation instructions for the PS Engineering PAC24series of Audio Selector Panel/Intercom Systems. This includes the following units:
Model Description Part Number
PAC24 Standard 050-240-0100
PAC24 Option 1, w/ Recorder 050-240-0200
PAC24 Observer 050-240-0400
PAC24 Observer Configuration with recorder 050-240-0401
PAC24 Standard, Vertical Orientation 050-240-0500
PAC24 Special Mission Application Units, Vertical
050-240-0503
Where the functions are identical to all units, it will be referred to herein as a PAC24. Otherwise, the applicable units will be specified.
NOTE: Observer configuration units cannot be mixed with Standard configuration units.
Observer units MUST be dual installations.
1.3 EQUIPMENT DESCRIPTION
The PAC24-series is a state of the art audio isolation amplifier and audio selector that contains an automatic voice activated (VOX) intercom system. It can switch up to five transceivers (Com 1, Com 2 Com 3
Com 4 and Com 5) and 4 receivers (Nav 1, Nav 2, AUX (or ADF in –0500, -0503) and MKR).
The Duplex Telephone mode allows the PAC24 to act as an audio interface between aircraft headphone
and microphones and specific aircraft approved (FAA/FCC) cellular telephone equipment.
Warning: Use of non-aviation approved cellular telephone equipment may be prohibited by regulation.
PS Engineering is not responsible for unauthorized airborne use of cellular telephones.
For airborne use, the PAC24 must be interfaced with an approved system.
There are two unswitched inputs, for autopilot disconnect, and/or radar altimeter warning. Push buttons
select the receiver audio source provided to the headphones. A SPR switch allows the user to listen to the
receiver(s) selected on the cabin speaker. Except for the unswitched inputs, all speaker audio is muted
during transmit.
DISCONTINUED
DISCONTINUED
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 1-2 Rev. 24, Dec. 2013
Push button switches select the communication transceivers in use for the pilot and copilot position, and
allow radio transmission. In "Split Mode" the PAC24 has the ability to allow the pilot and copilot to operate different transceivers independently. The Com 5/TEL mode (selected at installation) allows the pilot to
use the audio panel for duplex operation, such as with aviation-specific cellular telephones.
A fail-safe mode connects the pilot headphone and microphone to COM 1 if power is removed for any
reason, or if the power switch is placed in the Off (Fail-safe) position.
A voice activated (VOX) intercom is included in the PAC24. This system has PS Engineering’s exclusive
IntelliVox® circuitry that eliminates manual adjustments. The system contains six separate VOX mic circuits, and only opens the specific microphone channel in use.
The intercom system incorporates pilot isolate and crew modes, a monaural music input with "Soft Mute,"
and LED indicators transmit indications. Intercom control is through front panel-mounted knob and 3
position mode switch. A single volume controls intercom level for the pilot and copilot. Passenger headphone volume is factory set, and adjusted in flight with headset-mounted volume controls. Passenger volume control is further adjustable through screwdriver access in the top of the unit. Intercom squelch is
automatic.
The PAC24 is form fit and function compatible with the King Radio KMA24H, part number 066-105571, and may be compatible with 066-1055-70.
1.4 APPROVAL BASIS -
FAA-TSO Approval.
The PAC24 Audio Selector Panels are FAA approved under TSO C50c (Audio Amplifiers). In addition,
the PAC24 is JAA-JTSO approved under LBA.N-O.10.510/003JTSO.
All systems comply with relevant portions of EUROCAE ED-14C/DO-160D (Environmental Conditions and Test
Procedures for Airborne Equipment), ED12B/DO-178B (Software Considerations for Airborne Equipment) and ED18/DO-214 (Audio Systems Characteristics and Minimum Operational Performance Standards for Aircraft Audio
Systems).
NOTE: The recorder contained in Option 1 is not TSO-approved, and the installer must determine the relevant approval basis prior to installation. Contact PS Engineering for information regarding FAA approval.
Operation is subject to the following conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause undesired operation.
1.5 SPECIFICATIONS
TSO COMPLIANCE
Audio Selector/Intercom: C50c, Class A
APPLICABLE DOCUMENTS: RTCA/DO-214
RTCA/DO-160D
RTCA/DO-178B
ENVIRONMENTAL Qualifications: B1ZCABSRXXXXXXZBBBATMXXE2XXX
Temperature Range:
Operating:
Storage:
-20ºC to +55ºC with short term operating at +70°C
-55ºC to +85ºC
Altitude: Up to 50,000 feet in a non-pressurized area of the
cockpit.
DIMENSIONS: Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm)
Depth: 6.8 in. (17.3 cm) behind panel
WEIGHT (With Rack & Connectors): 1.5 lb. (0.54 kg)
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 1-3 Rev. 24, Dec. 2013
Specifications, Continued.
POWER REQUIREMENTS (Including Internal Lighting):
Voltage: 11 to 33 VDC
Maximum Current: 2.5 Amp (Externally protected by a 3 Amp circuit
breaker.)
Typical operating current:
Speaker off:
Speaker on, 28V, full radio volume
350 mA
1.5 A
Audio Selector Specifications
Audio selector panel input impedance:
510
Input Isolation: -60 dB (min.)
Speaker Muting: -60 dB (min.)
Speaker Output (into 4 ) with no clipping
14 VDC:
28 VDC:
3 Watts (min.)
10 Watts (min.)
Receiver Inputs: 10
(Com 1, Com 2, Com 3, Com 4, Com 5, Nav 1,
Nav 2, ADF, DME, MKR)
Unswitched Inputs: 2
(examples: GPS WPT, Value, Autopilot Discon-
nect, Altimeter DH)
Transmitter Selections: 5
(Com 1, Com 2, Com 3 Com 4, Com 5)
Speaker Impedance:
4 – 8
Headphone Impedance:
150 – 1000
Headphone Output: 38 mW each headset, no clipping <1% THD
120 mW each headset with < 10% THD into
150
Microphone Impedance:
150 - 600
Intercom Specifications
Intercom Positions: Minimum of 5 places (with individual IntelliVox® cir-
cuits)
Music Input:
1 (Monaural)
Music Muting:
>-30 dB "Soft Mute" when Com or intercom active.
Distortion:
<1% THD @ 38 mW into 150
<10% THD @ 120mW into 150
Mic Freq. Response, 3 dB:
300 Hz - 6000 Hz
Music Freq. Response, 3 dB:
100 Hz - 18kHz
1.6 EQUIPMENT SUPPLIED
1 ea. of the following units:
Model Description Part Number
PAC24 PAC24 Audio Control Panel with intercom 050-240-0100
PAC24 Option 1 PAC24 Audio Control Panel with intercom and digital recorder, 050-240-0200
PAC24 Observer PAC24 Audio Control Panel for Observer installation 050-240-0400
PAC24 Observer Option 1 PAC24 Audio Control Panel for Observer with recorder 050-240-0401
PAC24 Vertical PAC24 Audio Control Panel with intercom, Vertical Orientation 050-240-0500
PAC24 Special PAC24 Audio Controller, Special Mission Version, Vertical 050-240-0503
Observer (-04XX) units must be
dual installations, and cannot be
mixed with other part numbers.
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 1-4 Rev. 24, Dec. 2013
PAC24 Installation Kit: 250-240-0001
Description Quantity Part
Number
PAC24 installation rack assembly 1 475-240-0040
Molex Connector Shell w/key, 50 pin, key 17/18 1 120-425-5002
Gold Plated Crimp Pins 50 425-001-0002
4 40 X 7/16 screw w/nylon patch 4 475-440-0009
Grounding bar 1 430-007-0001
6-32 X 3/4 pan head Phillips screw 2 475-632-0038
6-32 Nut Flat 2 475-632-0003
6-32 Lock Nut 2 475-632-0004
Cable Clamp 1 625-001-0002
#6-32 x ½” Flat head Phillips screw 6 475-632-0012
#6-32 Clip Nut 6 475-630-0002
Parts identification sheet 1 002-250-0240
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED
a) Circuit Breaker: 1 ea. 3 amp
b) Cockpit Speaker, 4 recommended
c) Cabin or External Speaker 4 recommended
d) Headphone Jacks (as required)
e) Microphone Jacks (as required)
f) Headphones, 150 as required
g) Microphones, as required
h) Interconnect Wiring
1.8 LICENSE REQUIREMENTS
None
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 2-1 Rev. 24, Dec. 2013
Section II - Installation
2.1 GENERAL INFORMATION
2.1.1 SCOPE
This section provides detailed installation and interconnect instructions for the PS Engineering PAC24Series Audio Control Panel/Intercom System.
Please read this manual carefully before beginning any installation to prevent damage and postinstallation problems. Installation of this equipment requires special tools and knowledge.
NOTE: The PAC24 requires specialized knowledge and tools for an effective installation. An appropriately rated Certified Aircraft Repair Station must install this equipment in accordance with applicable
regulations. PS Engineering, Incorporated warranty is not valid unless the equipment is installed by an
authorized PS Engineering, Incorporated dealer. Failure to follow any of the installation instructions, or
installation by a non-certified individual or agency will void the warranty, and may result in an unairwor-
thy installation.
2.2 Unpacking and Preliminary Inspection
Use care when unpacking the equipment. Inspect the units and parts supplied for visible signs of shipping
damage. Examine the unit for loose or broken buttons, bent knobs, etc. Verify the correct quantity of
components supplied with the list in Section 1.6 (B). If any claim is to be made, save the shipping material and contact the freight carrier. Do NOT return units damaged in shipping to PS Engineering. If the
unit or accessories shows any sign of external shipping damage, contact PS Engineering to arrange for a
replacement. Under no circumstances attempt to install a damaged unit in an aircraft. Equipment returned
to PS Engineering for any other reason should be shipped in the original PS Engineering packaging, or
other UPS approved packaging.
2.3 Equipment Installation Procedures
2.3.1 Cooling Requirements
Forced air cooling of the PAC24 is not required. However the unit should be kept away from heat producing sources (i.e. defrost or heater ducts, dropping resistors, heat producing avionics) without adequate
cooling air provided. Outside, ram air cooling of the unit is not permitted, and may result in damage.
2.3.2 Internal DIP Switch Configuration
The PAC24 can be easily configured for many different applications. This includes dual audio panel installations.
The tables below describe the various internal switch selections. There are two sections, the first explains
what each switch does, the second is a list of specific configurations. For more information, consult
PAC24 Configuration Quick Reference Guide, document number 200-240-0310.
In a single installation, with no options, no action is required. In dual installations, place the DIP switches
into the proper position to configure the PAC24 as the pilot, or copilot panel. By designating a pilot or
copilot panel, the aircraft commander, or pilot, will have priority for transmissions and intercom mode
selection.
Note:
Bold=Default settings (as shipped from factory)
Units are shipped as single unit configuration, 28V lighting.
PAC24 units MUST be reconfigured before any other configuration is used.
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 2-2 Rev. 24, Dec. 2013
To access the DIP switches, remove the top cover by removing the two (2) screws at the sides holding the
cover in place.
Figure 2-1 DIP Switch locations
S2
S3 S5 S4
4 3 2 1 4 3 2 1
4 3 2 1 4 3 2 1
DIP Switches
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 2-3 Rev. 24, Dec. 2013
PAC24 Rear Connector
2
a
CVR Audio
Playback
Pass 3
Expansion power
S2
22
23
Pass 1 Mic
Expansion in
Pass 2 Mic
Expansion out
S3
18
U
14V light Hi
Swap
28V light hi
Swap
S4
Expansion Active
Dual System
Copilot Unit
TEL/Duplex
S5
Logic
+5
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
Figure 2-2 DIP switches shown schematically
2.3.2.1 Single/Dual configuration jumpers J4 & J5
Single System or Pilot Audio Panel Copilot Audio Panel
J4 ON (installed)
J4 OFF (Removed)
J5 Jumper Pins 1 & 2
J5 Jumper Pins 2 &3
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 2-4 Rev. 24, Dec. 2013
Figure 2-3 Pilot/Copilot panel Jumper Location
Switch S5
2
OFF
ON ON
3
OFF
Single
PAC24
Installation
OFF
Pilot unit –Dual
Installation
ON
Copilot unit –
Dual Installation
Table 2-1 Pilot/Copilot Dual Panel Selection Switch (S5)
2.3.2.2 Pass 3 / Expansion – J3, pin a configuration (S2)
As shipped, the PAC24 is 5-place intercom, and the ability to convert the system from a 5-place intercom
to use an expansion unit that will allow up to 8 places on the intercom per audio panel.
Switch S2
3
ON
OFF
4
OFF
Pass 3 Mic Input
ON
Expansion Power
out
2.3.2.3 Pass 1 / Expansion – J3, pin 22 configuration (S2)
Switch S3
1
ON
OFF
2
OFF
Pass 1 mic input
ON
Expansion audio
input
J5
J4
Pin 1
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 2-5 Rev. 24, Dec. 2013
2.3.2.4 Pass 2 / Expansion - J3, pin 23 configuration (S3)
Switch S3
3
ON
OFF
4
OFF
Pass 2 mic input
ON
Expansion audio
output
2.3.2.5 CVR / IRS Control – J3, pin 2 configuration (S2
PAC24 units can be equipped with an optional Intercom Recording System (IRS, P/N –0200, -0401),
which will store up to 60 seconds of radio traffic (on the transceiver selected for transmit). The playback
control is a normally open switch connected to ground, which triggers the stored audio.
Internal Recording System units are incompatible with the standard Cockpit Voice Recorder output
Switch S2
1
ON
OFF
2
OFF
CVR Output
ON
IRS Playback Input
2.3.2.6 14-Volt Backlighting / Swap – J3, pin 18 configuration (S4)
The installer has the option of implementing PS Engineering’s patented “Swap” function, which allows
the pilot to switch between Com 1 and Com 2 with an external switch. The Swap command is controlled
through the unused backlight input, and selected by the internal DIP switch.
Switch S4
1 ON
OFF
2 OFF
14 V lighting
control
ON
Swap switch
2.3.2.7 28-Volt Backlighting / Swap – J3, pin U configuration (S4)
Switch S4
3
ON
OFF
4
OFF
28 V lighting
control
ON
Swap switch
2.3.2.8 Backlight 14/28V
Switch 14 V 28V
1 On
Off
2 Off
On
3 Off
On
4 On
Off
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 2-6 Rev. 24, Dec. 2013
14 V Aircraft 28 V aircraft
Pin 18= 14 V input Pin 18=Swap
Pin U=Swap Pin U =28 V input
2.3.2.9 Expansion Mode / Telephone configuration (S5)
Switch S5
1 On Expansion Unit Present (11606 installed)
4 On
Duplex Telephone mode for Com 5
NOTE: Set both audio panels the same in a dual installation
2.3.2.10 Observer System Installation Configuration (S5)
NOTE: -0400 and -0401 units must be interfaced with other like part number units and are always dual
installations.
When the Observer versions are used (Part Number 050-240-0400, -0401) the cockpit unit is configured
as “Crew” and the Observer station is configured as “Observer.”
Switch S5
2 ON ON
3 OFF
Cockpit unit –
Observer Installa-
tion
ON
Observer unit –
Installation
Switch S3
1
OFF
2
ON
Expansion In
enabled
3
OFF
4
ON
Expansion Out
enabled
Switch S2
3
ON
4
OFF
Pass Input
In an observer unit, jumpers J4 and J5 should be configured like a copilot's unit in dual installation.
2.3.3 DIP Switch Cross reference.
Single Installation- 28 Volt Aircraft Single panel with Expansion - 28 Volt Aircraft
SW2 SW3 SW4 SW5
SW2 SW3 SW4 SW5
1
ON ON OFF OFF
1
OFF OFF OFF ON
2
OFF OFF ON OFF
2
ON ON ON OFF
3
ON ON ON OFF
3
OFF OFF ON OFF
4
OFF OFF OFF See
notes
4
ON ON OFF See notes
J4- On/ J5- Pins 1 & 2
J4- On/ J5- Pins 1 & 2
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