PS Engineering PMA8000E Installation And Operation Manual
9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
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A88000000
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Document P/N 200-890-0414
Rev. 2, May 2016
Audio Selector Panel with Marker Beacon Receiver
High-fidelity Stereo Intercom
Designed specifically for Dual Audio Panel Configurations
System Installation and Operation Manual
FAA- TSO C50c, C35d
EASA ETSO C50c, 2C35d
Patented under one or more of the following;
No. 4,941,187; 5,903,227; 6,160,496 and 6,493,450
PS Engineering, Inc. 2016 ©
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 contact@ps-engineering.com.
In certified aircraft, warranty is not valid unless this product is installed by an
Authorized PS Engineering dealer.
9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
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A88000000
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Document P/N 200-890-0414
Rev. 2, May 2016
High-fidelity Stereo Intercom
FAA- TSO C50c, C35d
EASA ETSO C50c, 2C35d
PS Engineering, Inc. 2016 ©
Copyright Notice
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................................ ........................................................................................................... 1-3
1.6 EQUIPMENT SUPPLIED................................................................................................................................ 1-4
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED ....................................................................................... 1-4
1.8 OPTIONAL ITEMS.......................................................................................................................................... 1-4
1.9 LICENSE REQUIREMENTS.......................................................................................................................... 1-4
Section II - INSTALLATION ...................................................... 2-1
2.1 GENERAL INFORMATION........................................................................................................................... 2-1
2.1.1 SCOPE.............................................................................................................................. 2-1
2.1.2 CERTIFICATION REQUIREMENTS ...................................................................................... 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 MOUNTING REQUIREMENTS ............................................................................................. 2-1
2.3.3 AUDIO PANEL MOUNTING RACK INSTALLATION ............................................................. 2-1
2.3.4 AUDIO PANEL TRAY AND CONNECTOR ASSEMBLY ......................................................... 2-2
2.4 CABLE HARNESS WIRING ................................................................................................................................... 2-2
2.4.1 ELECTRICAL NOISE........................................................................................................... 2-2
2.4.2 POWER .............................................................................................................................. 2-3
2.4.3 AUDIO PANEL INTERFACE ................................................................................................ 2-3
2.4.4 COCKPIT SPEAKER ............................................................................................................ 2-3
2.4.5 BACKLIGHTING ................................................................................................................. 2-3
2.4.6 UNSWITCHED INPUTS........................................................................................................ 2-3
2.4.7 "SWAP" MODE .................................................................................................................. 2-4
2.4.8 BLUETOOTH TELEPHONE FUNCTION ................................................................................ 2-4
2.4.9 PUBLIC ADDRESS MODE................................................................................................... 2-4
2.4.10 PA MUTE (J2, PIN 12)..................................................................................................... 2-5
2.4.11 MISCELLANEOUS LOGIC OUTPUT (J2, PIN 18) ............................................................... 2-5
2.4.12 MARKER HIGH SENSITIVITY (J2 PIN 13) ........................................................................ 2-5
2.4.13 DUAL AUDIO PANEL CONNECTIONS .............................................................................. 2-5
2.4.14 CVR OUTPUT (J2, PIN 4) ................................................................................................ 2-6
2.5 INTERCOM WIRING .............................................................................................................................................. 2-6
2.5.1 ENTERTAINMENT INPUTS.................................................................................................. 2-6
2.5.2 ENTERTAINMENT MUTING ................................................................................................ 2-6
2.5.3 PLAYBACK BUTTON INSTALLATION ................................................................................. 2-7
2.5.4 PASSENGER INTERCOM EXPANSION (INTELLIPAX) ......................................................... 2-7
2.6 MARKER BEACON INSTALLATION ...................................................................................................................... 2-7
2.6.1 MARKER ANTENNA INSTALLATION ................................................................................. 2-7
2.6.2 EXTERNAL MARKER LIGHTS ............................................................................................ 2-7
2.6.3 MIDDLE MARKER SENSE .................................................................................................. 2-7
2.6.4 MARKER SENSITIVITY SWITCH (J2 PIN 13)....................................................................... 2-7
2.6.5 MARKER AUDIO INPUT ..................................................................................................... 2-7
2.7 ADJUSTMENTS ..................................................................................................................................................... 2-8
2.8 COMMUNICATIONS ANTENNA INSTALLATION NOTES ........................................................................................ 2-9
2.9 PMA8000E PIN ASSIGNMENTS ......................................................................................................................... 2-10
2.10 WIRING CHECKOUT ................................................................ .......................................................................... 2-11
2.11 UNIT INSTALLATION ......................................................................................................................................... 2-11
2.12 OPERATIONAL CHECKOUT ............................................................................................................................... 2-11
2.12.1 REQUIRED TEST EQUIPMENT ........................................................................................ 2-11
PS Engineering
PMA8000E Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0304 Page ii Rev. 2, May 2016
2.12.2 AUDIO PANEL TEST ...................................................................................................... 2-11
2.12.3 MARKER CHECKOUT .................................................................................................... 2-12
2.12.4 BLUETOOTH TELEPHONE CHECKOUT ........................................................................... 2-12
2.12.5 INTERNAL RECORDER CHECKOUT ................................................................................ 2-12
2.13 FINAL INSPECTION ................................ ............................................................................................................ 2-12
Section III OPERATION.......................................................... 3-1
3.1 SCOPE ............................................................................................................................................................... 3-1
3.2 COMMUNICATIONS TRANSMIT (XMT) SELECTION (2)................................................................ ....................... 3-1
3.1 COMMUNICATIONS RECEIVER (RCV) SELECTION (3) ....................................................................................... 3-1
3.2 AUDIO SELECTOR (4).......................................................................................................................................... 3-2
3.3 BLUETOOTH TELEPHONE.................................................................................................................................... 3-2
3.3.1 PASSENGER ON CELL PHONE ............................................................................................. 3-3
3.3.2 CELL PHONE SIDETONE .................................................................................................... 3-3
3.4 COCKPIT SPEAKER (5) ................................................................................................................................ ........ 3-3
3.4.1 PUBLIC ADDRESS FUNCTION ............................................................................................ 3-3
3.5 MARKER BEACON OPERATION (9) (APPLIES TO -0514 & -0515 ONLY).............................................................. 3-3
3.5.1 MARKER TEST AND MUTE................................................................................................ 3-4
3.5.2 EXTERNAL MARKER AUDIO INPUT .................................................................................. 3-4
3.6 INTERCOM OPERATION....................................................................................................................................... 3-4
3.6.1 INTELLIVOX® VOX-SQUELCH.......................................................................................... 3-4
3.6.2 INTERCOM VOLUME CONTROL (7) ................................................................................... 3-5
3.6.3 INTERCOM MODES (8) ...................................................................................................... 3-5
3.7 MUSIC AND MUSIC MUTING (6) .......................................................................................................................... 3-6
3.8 BLUETOOTH® INTERFACE .................................................................................................................................. 3-7
3.8.1 PAIRING AND UNPAIRING BLUETOOTH DEVICES .............................................................. 3-7
3.9 INTERNAL RECORDER AND PLAYBACK ............................................................................................................... 3-7
Section IV – Warranty and Service ................................................. 4-1
4.1 WARRANTY ................................................................................................................................ ......................... 4-1
4.2 FACTORY SERVICE .............................................................................................................................................. 4-1
Appendix A – PMA8000E Installation Drawings .................................................................................A
Appendix B –PMA8000E Radio Interconnect .................................................................................. B
Appendix C – PMA8000E Audio Interconnect ..................................................................................C
Appendix D – Instructions for FAA Form 337 and continuing airworthiness ...................................D
8.1 INSTRUCTIONS FOR FAA FORM 337, AUDIO PANELS ........................................................................................... D
8.2 INSTRUCTIONS FOR CONTINUING AIRWORTHINESS , AUDIO SYSTEM ................................................................... D
Appendix E – RTCA DO160D Environmental Qualification Form ........................................................ E
Rev
Date
Change
0
March 2015
Release of PMA8000E
1
August 2015
Change Music behavior to turn music off when ISO mode is invoked on intercom §3.6.3
2
May 2016
Clarify Marker Audio Input for -0414 and -0415 versions (§2.6.5, §3.1.2)
PS Engineering
PMA8000E Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0304 Page 1-1 Rev. 2, May 2016
Section I – GENERAL INFORMATION
1.1 INTRODUCTION
The PMA8000E represents another evolutionary step in cockpit audio control and intercommunications
utility. Using our patented IntelliVox® design and pilot programmable configurations, this marks the next
level of audio control. The unit is designed for outstanding ergonomics and visually def ined mode annunciation and selection. The PMA8000E is specifically designed to be used in a dual audio panel environment;
where the pilot and copilot positions have independent control over the radio audio control. The
PMA8000E units communicate information between the units to make the operation logical and utilitarian,
and avoid operations that are inconsistent with radio and cockpit communication practices.
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 PMA8000E.
1.2 SCOPE
This manual provides detailed installation and operation instructions for the PS Engineering PMA8000Eseries of Audio Selector Panel/Intercom Systems. This includes the following units:
Unit Part Number
Backlighting
Bezel
Marker Beacon
CVR Output
050-890-0414
14/28 VDC
BlackNoYes
050-890-0415
5 VDC
BlackNoYes
050-890-0514
14/28 VDC
Black
Yes
Yes
050-890-0515
5 VDC
Black
Yes
Yes
Each ship set requires two units and installation kits.
1.3 EQUIPMENT DESCRIPTION
The PMA8000E is a state-of-the-art audio isolation amplifier and audio selector that contains an automatic
voice activated (VOX) intercom system and integral marker beacon receiver. It can switch three transceivers (COM 1, COM 2, COM 3) and six receivers (NAV 1, NAV 2, ADF, AUX (DME), and MKR.
The PMA8000E was designed specifically for installations requiring Dual Audio Panels, because the pr imary audio panel sends status information to the secondary audio panel to prevent undesirable operation
modes such as simultaneous transmission on the same radio by both crew members, and primary control
over the intercom modes.
A full duplex telephone interface allows the PMA8000E to act as an audio connection between aircraft
headphone and microphones and specific aircraft approved (FAA/FCC) equipment with the Bluetooth®
interface.
Warning: Use of non-aviation approved cellular telephone equipment may be prohibited by FCC regulation.
PS Engineering is not responsible for unauthorized airborne use of cellular telephones.
For airborne use, the PMA8000E must be interfaced with an approved system.
There are four unswitched inputs, available for traffic or EGPWS, autopilot disconnect, and/or radar altim eter warning. Unswitched input 3 is adjustable, see page § 2.4.8
Pushbuttons select the receiver audio source provided to the headphones. A SPR button allows the user to
listen to the receiver(s) selected on the cabin speaker. Except for the unswitched inputs, all speaker aud io is
muted during transmit. Unswitched inputs 1, 3, and 4 are always presented to the aircraft speaker.
Unswitched input 2 will be presented to the speaker when the SPR push button has been selected. Pushbutton switches select one of the communication transceivers.
A fail-safe mode connects the crewmembers’ 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.
PS Engineering
PMA8000E Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0304 Page 1-2 Rev. 2, May 2016
NOTE: Both crew members are connected to COM 1 in fail -safe. There is no priority, and in some cases
microphone loading may make it necessary to unplug one crew member’s microphone for optimum tran smission quality.
A voice activated (VOX) intercom is included in the PMA8000E. This system has PS Engineering’s patented IntelliVox® circuitry that eliminates manual adjustments. The intercom system incorporates pilot
isolate, all and crew modes, two independent stereo music inputs with "SoftMute™". Intercom volume
control is through two concentric front panel knobs and a pushbutton intercom mode switch. The small
volume knob controls the intercom level for the pilot and copilot, while the large knob on the copilot audio
panel controls the passenger intercom volume. Intercom squelch is automatic.
A 3-light, 75 MHz Marker Beacon receiver is integrated in certain versions of the PMA8000E (-0514, -
0515). This provides the necessary Marker Beacon lights and audio indications necessary for that portion of
an Instrument Landing System (ILS) approach. A pushbutton labeled MKR allows the pilot select high or
low sensitivity as well as test and mute modes.
In the PMA8000E, a Bluetooth® wireless interface is available for wireless telephone and music connection.
1.4 APPROVAL BASIS
FAA TSO Approval.
The PMA8000E-series Audio Selector Panels are FAA approved under TSO C50c (Audio Ampli fiers) and
TSO C35d (Marker Beacon Receivers), ETSO C50C/ and 2C53d.
All systems comply with relevant portions of EUROCAE RTCA MPS WG No. 7/70, DO -143 and (Marker
Beacon Receivers), ED-14C/DO-160C (Environmental Conditions and Test Procedures for Airborne
Equipment), ED12B/DO-178B, Level D (Software Considerations for Airborne Equipment ) and ED-
18/DO-214 (Audio Systems Characteristics and Minimum Operational Performance Standards for Aircraft
Audio Systems).
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 oper ation.
PS Engineering
PMA8000E Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0304 Page 1-3 Rev. 2, May 2016
1.5 SPECIFICATIONS
TSO COMPLIANCE
Marker Beacon:
FAA TSO C35d, Class A ETSO 2C35d
Audio Selector/Intercom:
FAA TSO C50c, Class 1a ETSO C50c
APPLICABLE DOCUMENTS:
RTCA/DO-214 RTCA/DO-143 RTCA/DO-160D
Depth behind panel 7.15 in. (18.16 cm)
WEIGHT
PMA8000E Unit
Rack with connectors
1.34 lb. (0.61 kg)
0.51 lb. (0.24 kg)
POWER REQUIREMENTS (Including Internal Lighting):
Voltage:
11 to 33 VDC
Maximum Current:
2.5 Amp (Externally protected by a 5A pull-type breaker)
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:
9 (COM 1, COM 2, COM 3, NAV 1, NAV 2, ADF,
DME, MKR, AUX)
Unswitched Inputs:
4
Transmitter Selections:
6 (COM 1, COM 2, COM 3
Com1/2 COM 1/3, COM 2/3)
Speaker Impedance:
4
Headphone Impedance:
150 – 1000
Headphone Output:
38 mW each headset, no clipping <1% THD typical
Microphone Impedance:
150 - 600
Bluetooth Radio (PMA8000E -0304 only)
Class 3, FCC ID QOQWT32AE
Intercom Specifications
Intercom Positions:
6 places (with individual IntelliVox® circuits)
Music Inputs:
2, (Independent, Stereo)
Music Muting:
>-30 dB "Soft Mute" when COM or intercom active.
Distortion:
<1% THD @ 38 mW into 150
Mic Freq. Response, 3 dB:
300 Hz - 6000 Hz
Music Freq. Response, 3 dB:
10 Hz – 26 kHz
MARKER BEACON RECEIVER (-0514 & -0515):
Frequency:
75 MHz Crystal Controlled
Sensitivity:
Low:
High:
Capable of: (preset at factory for field application)
1000 Volts (Hard) (360 to 570 V soft)
200 Volts (Hard) (130 to 200 V soft)
Selectivity:
-6 dB at ±10 kHz
-40 dB at ±120 kHz
External Lamp Output:
7.5 (±4 VDC unloaded, at maximum brightness) VDC
positive when active, max. current 125 mA
MM Sense:
Active high (4.5 ± 1.0VDC)
ENVIRONMENTAL Qualifications:
Operating Temperature Range:
Altitude:
DIMENSIONS:
RTCA/DO-178B DO-254
A1D1CABSMXXXXXXZBABATBXXE2XXX
-15º C to 55ºC
Up to 50,000 feet in an non-pressurized area
Height: 1.3 in. (3.3 cm) Width: 6.25 in. (15.9 cm)
PS Engineering
PMA8000E Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0304 Page 1-4 Rev. 2, May 2016
1.6 EQUIPMENT SUPPLIED
One ship set includes 2 ea. of the following units:
Model
Description
Part Number
PMA8000E
Stereo Audio Selector Panel, Bluetooth® interface and Internal Recorder Sy stem. This supports three com transceivers.
Designed specifically for Dual Audio Panel Installation.
2 ea. 050-890-0414
PMA8000E
Same as above, with 5VDC backlighting
2 ea 050-890-0415
PMA8000E
Stereo Audio Selector Panel with Marker Beacon, Bluetooth® interface and
Internal Recorder System. This supports three com transceivers.
Designed specifically for Dual Audio Panel Installation.
2 ea. 050-890-0514
PMA8000E
Same as above, with 5VDC backlighting
2 ea 050-890-0515
PMA8000E Installation Kit: 250-890-0000 (2 kits required for dual installation)
Description
Quantity
Part Number
Installation rack assembly
1
430-890-0040
Rack back plate
1
430-890-0050
44-pin connector kit
2
120-891-2045
Backshell, connector
2
625-025-2465
Backshell Mounting Blocks
2
431-891-0100
4 40 X 7/16 screw w/nylon patch
4
475-440-0007
4 40 X 3/8 screw w/nylon patch
4
475-440-1038
4-40 x ¼” screw with lock washer
2
475-440-0001
Grounding Solder Lug
2
475-009-0001
Cable Clamp
1
625-001-0002
#6-32 x ½” Flat head Philips screw
6
475-632-0012
#6-32 Clip Nut
6
475-630-0002
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED
a. Circuit Breaker: 1 ea; 5 amp PULL TYPE REQUIRED for PMA8000E
b. Speaker, 4
c. Headphone Jacks (Stereo, as Required)
d. Microphone Jacks (as Required)
e. Headphones, 150 (Stereo), up to 6 as required
f. Microphones, up to 6 as required
g. Marker Antenna (75 MHz, VSWR <1:1.5, and appropriate for the airspeed)
h. Interconnect Wiring
1.8 OPTIONAL ITEMS
a. Music Patch Cord, 3.5mm to 2.5mm, PS Part Number 425-006-2535
b. Passenger intercom unit, IntelliPAX, if desired 11636Remote
1.9 LICENSE REQUIREMENTS
None
PMA8000E Bluetooth™ Radio approval:
FCC ID: QOQWT32AE
Industry Canada ID: 5123A-BGTWT32AE
CE EMC Directive 89/336/EEC as amended by Directives 92/31/EEC and 93/68/EEC
PS Engineering
PMA8000E Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0304 Page 2-1 Rev. 2, May 2016
Section II - INSTALLATION
2.1 GENERAL INFORMATION
2.1.1 SCOPE
This section provides detailed installation and interconnection instructions for the PS Engineering
PMA8000E Audio Selector Panel/Intercom/ with internal Marker Beacon.
Please read this manual carefully before beginning any installation to prevent damage and post -installation
problems. Installation of this equipment requires special tools, test equipment (refer to section 2.12.1)
and knowledge as required by 14 CFR 65.81 (b).
2.1.2 Certification Requirements
NOTE
The PMA8000E requires specialized knowledge and tools for an effective installation. An appropr iately
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 unairworthy 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 co mponents supplied with the list in Section 1.6. If any claim is to be made, sav e the shipping material and contact the freight carrier. Do NOT return units damaged in shipping to PS Engineering. If the unit or accessories show 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 Eng ineering 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 PMA8000E is not required. However, the units should be kept away from heat
producing sources (i.e. defrost or heater ducts, dropping resistors, heat producing avionics) without ad equate cooling air provided.
2.3.2 Mounting Requirements
Each PMA8000E must be rigidly mounted to the instrument panel of the aircraft structure, within view and
reach of the flight crew position. Installation must comply with FAA Advisory Circular AC 43.13 -2B, or
other FAA-approved aircraft technical data. The unit may be mounted in any area where adequate clea rance for the unit and associated wiring bundle exist.
To prevent noise, avoid installing the unit close to high current devices or systems with high -voltage pulse
type outputs, such as DME or transponders. Avoid running the interconnecting bundles near any high cu rrent wires.
2.3.3 Audio Panel Mounting Rack Installation
Remove the unit from the mounting tray by unscrewing the 3/32" hex -head screw that is in the center of the
unit. Use caution to avoid hitting the photo-detector lens which is located directly above the hex-head
screw. Carefully slide the unit free of the tray. Set the unit aside in a safe location until needed. Install the
tray using six #6-32 clip nuts (475-630-0002), and six FHP #6-32 x ½" screws (475-632-0012). The audio
selector panel must be supported at front and rear of the mounting tray.
PS Engineering
PMA8000E Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0304 Page 2-2 Rev. 2, May 2016
2.3.4 Audio Panel Tray and Connector Assembly
The rack back plates mate with two 44-pin connectors in each PMA8000E. The connectors are a subminiature crimp-type, and require the use a hand crimp tool, from table below (or equiv.). The 44 pin connectors are mounted to the tray back plate (430-890-0050) with quantity 4, #4-40 x 3/8” screws (475-440-
1038) and the quantity 2, back shell retainer mounting blocks (431-891-0100). Ensure that proper strain
relief and chafing precautions are made during wiring and installation, using the cable clamp (625 -001-
0002).
Because the connector back shell (625-025-2465) is a single piece, the harness should be passed through
the shell before the pins are inserted into the connector.
Two grounding solder lugs are provided (475-009-0001) for each unit, which may be attached to the rear
mounting plate with 2 ea #4-40 x ¼” (475-440-0001) screws with captivated lock washers. These provide a
convenient location to connect the shield ground terminations.
Manufacturer
Crimping Tool
Positioner
Extraction tool
AMP
601966-1
601966-6
91067-1
Daniels
AFM8
K42
M24308-1
ITT-Cannon
995-0001-584
995-0001-739
91067-1
Table 2-1 Connector Pin crimping tools
2.4 Cable Harness Wiring
Referring to the appropriate Appendix, assemble a wiring harness as required for the installation. All wires
must be MIL-SPEC in accordance with current regulations. T wo- and three-conductor shielded wire must
be used where indicated, and be MIL-C-27500 or equivalent specification. Proper stripping, shielding and
soldering technique must be used at all times. It is imperative that correct wire be used.
Refer to FAA Advisory Circular 43.13-2B for more information. Failure to use correct techniques may
result in improper operation, electrical noise or unit failure. Damage caused by improper installation will
void the PS Engineering warranty.
2.4.1 Electrical Noise
Due to the variety and the high power of radio equipment often found in today's general aviation aircraft,
there is a potential for both radiated and conducted noise interference.
The PMA8000E power supply is specifically designed to reduce conducted electrical noise on the aircraft
power bus by at least 50dB. Although this is a large amount of attenuation, it may not eliminate all noise,
particularly if the amplitude of noise is very high. There must be at least 13.8 VDC present at the connec tor, J2 pins 8 & 9, of the PMA8000E for the power supply to work in its designed regulation. Otherwise, it
cannot adequately attenuate power line noise. Shielding can reduce or prevent radiated noise (i.e., beacon,
electric gyros, switching power supplies, etc.) However, installation combinations can occur where interference is possible. The PMA8000E was designed in a RFI hardened chassis and has internal Electromagnetic Interference (EMI) filters on all inputs and outputs.
Ground loop noise occurs when there are two or more ground paths for the same signal (i.e., airframe and
ground return wire). Large cyclic loads such as strobes, inverters, etc., can inject noise signals onto the ai rframe that are detected by the audio system. Follow the wiring diagram very carefully to help ensu re a minimum of ground loop potential. Use only Mil Spec shielded wires (MIL -C-275000, or better). Under no
circumstances combine a microphone and headphone wiring into the same shielded bundle. Always use a
2- or 3-conductor, shield wire as shown on the installation-wiring diagram.
The shields can be daisy-chained together, and then connected to the ground lugs mounted on the back
plate shown in Appendix B.
Radiated signals can be a factor when low level microphone signals are "bundled" with current carryi ng
power wires. Keep these cables physically separated. It is very important that you use insulated washers to
isolate the ground return path from the airframe to all headphone and microphone jacks.
PS Engineering
PMA8000E Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0304 Page 2-3 Rev. 2, May 2016
2.4.1.1 Music Inputs and Noise
PMA8000E units utilize a differential input to help prevent noise from entering the music system. This
feature is usually transparent to the installer; however, it is important that the appropriate music signal and
ground connections are made directly to the dedicated music signal and grou nd inputs on the PMA8000E.
The power for IFE and audio panel should be a common bus.
If a music jack instead of a music source is installed for Music 1 or 2, we recommend grounding the jack to
airframe ground.
NOTE
Adding a high-performance audio control system, particularly in conjunction with high-performance active
noise canceling headsets, cannot improve on older avionics that were designed for cabin -speaker use. PS
Engineering makes no claim that the audio panel will provide a noise -free audio quality under all installation conditions, particularly with older avionics.
2.4.2 Power
The PMA8000E is compatible with both 14 and 28 Volt DC systems. A five (5) Amp circuit breaker is
required for all installations. Power and ground wires should be #22 connected t o J2 Pins 8 and 9 on each
audio panel. Connect airframe ground to J2 Pin 10 and 11 only, in each audio panel. No dropping resistors
are required.
2.4.3 Audio Panel interface
The PMA8000E is designed to interface with standard aircraft avionics, with a 510 receiver impedance.
For best results, a twisted-shielded cable is recommended from the avionics audio source to the audio pa nel, with the shield grounded at the audio panel end.
Some avionics do not provide a separate audio low, and may introduce additional ele ctrical noise into the
system. For best results, connect the audio low from the audio panel to the radio ground, using one condu ctor of the twisted-shielded cable.
2.4.4 Cockpit Speaker
Each PMA8000E contains a cockpit speaker amplifier. Any radio audio source will be presented to the
cockpit speaker when the SPR button is selected.
NOTE: Do NOT connect both audio panels directly to a single cockpit speaker. This could damage
the audio panel. A dedicated cockpit speaker is recommended for each audio panel.
2.4.5 Backlighting
The PMA8000E has an automatic dimming of the pushbutton green annunciation LEDs and marker lamps
controlled by a photocell. Control of the unit white backlighting is through the aircraft avionics dimmer.
For 14 V (or 5 VDC p/n 050-890-0415, only) aircraft, connect J2 Pins 6 and 7 to the aircraft dimmer bus,
and pin 5 to ground. For 28-volt systems, connect pin 7 to the aircraft dimmer, and pins 5 and 6 to ground.
2.4.6 Unswitched inputs
PMA8000E, J1, pins 31, 29 and J2 pin 15 are unswitched, unmuted (by transmitter keying), inputs # 1, 3
and 4, respectively. These inputs are presented to the pilot audio panel and copilot audio panel regardless of
the audio configuration, and will always mute the entertainment inputs. These 510Ω inputs can be used for
altimeter DH audio, GPS waypoint audio, and autopilot disconnect tones, or any other critical audio signal.
Unswitched #1 is always present to the speaker and crew headphones Unswitched 3 and 4 inputs are always
presented to the crew headphones and to the aircraft speaker.
Unswitched
Input
Hear in
Fail Safe
Hear in
Crew Headset
SPR button
Select
Gain
1
Yes
Yes
No
1:1(fixed)2No
Yes
Yes
1:1(fixed)
3NoYes
No
Adjustable
4NoYes
No
1:1(fixed)
Table 2-2 Unswitched input table
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