PS Engineering PRD60 User manual

9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
P
PR RD D6 60 0
Remote Aural Warning System and Summing
Amplifier
Installation and Operation Manual
Document P/N 200-160-0200
Revision 3, Sept. 2012
PS Engineering, Inc. 2012 ©
Copyright Notice
Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written permission of PS En-
gineering, Inc. is strictly prohibited. For further information contact the Publications Manager at PS Engineering, Inc., 9800 Mar-
tel Road, Lenoir City, TN 37772. Phone [phone].
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 -NONE.............................................................................................1-1
1.5 SPECIFICATIONS...........................................................................................................1-2
1.6 EQUIPMENT SUPPLIED...............................................................................................1-2
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED ......................................................1-3
1.8 LICENSE REQUIREMENTS .........................................................................................1-3
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.............................................................................................2-2
2.3.3 CONNECTOR ASSEMBLY ..................................................................................................2-2
2.4 CABLE HARNESS WIRING .................................................................................................2-2
2.4.1 NOISE ...............................................................................................................................2-2
2.4.2 POWER (PIN 25)................................................................................................................ 2-3
2.4.3 AUDIO MESSAGE INSTALLATION .....................................................................................2-3
2.4.4 UNSWITCHED INPUTS (PINS 3, 4, 15, AND 16)..................................................................2-3
2.4.5 HEADSET WIRING .............................................................................................................2-3
2.5 ADJUSTMENTS....................................................................................................................2-4
2.6 POST INSTALLATION CHECKOUT.....................................................................................2-4
2.6.1 OPERATIONAL CHECKOUT ...............................................................................................2-4
2.6.2 DIGITAL ANNUNCIATION CHECKOUT...............................................................................2-4
2.7 FINAL INSPECTION.............................................................................................................2-4
SECTION III OPERATION...............................................................................................3-1
3.1 SCOPE .................................................................................................................................3-1
3.2 AUDIO MESSAGING SYSTEM .............................................................................................3-1
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 CONNECTOR INTERCONNECT...............................................................B
6.1 INSTRUCTIONS FOR CONTINUING AIRWORTHINESS, .........................................................C
Record of revisions:
Revision
Date
Reason
1
April 2005
Corrected section 2.4.3
2
February 2007
Clarified Section 2.4.6, wiring C
3
September 2012
Removed references to Recorder Function (not used)

PS Engineering
PRD60 Remote DRAWS Unit
Installation and Operator’s Manual
200-160-0200 Page 1-1 Rev 3, Sept. 2012
Section I - GENERAL INFORMATION
1.1 INTRODUCTION
The PRD60 is an accessory device designed to improve the safety of flight by providing
an aural annunciation of out of limit conditions. In a critical situation this directs the pi-
lot’s attention to the proper indicator. This system does not replace any existing annuncia-
tion, but adds an additional layer of vigilance.
In addition, the unit contains a 4-channel summing amplifier to allow multiple un-
switched audio sources to be combined into one output.
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 PRD60.
1.2 SCOPE
This manual provides detailed installation and operation instructions for the PS Engineer-
ing PRD60-series of Audio Selector Panel/Intercom Systems. This includes the following
units:
Model
Description
Part Number
PRD60
Remote Digital Aural Warning System
050-160-0200
PRD60
Remote DRAWS with custom messages
050-160-xxxx
1.3 EQUIPMENT DESCRIPTION
The unit is a remote-mounted device with input for up to six (6) discrete, ground seeking
annunciations.. In addition, a 4-channel summing amplifier allows multiple unswitched
inputs to be combined into a single output.
The messages are pre-programmed by the factory to meet the customer’s requirements.
The unit also provides audio summing for up to four unswitched inputs.
1.4 APPROVAL BASIS - None
None
NOTE: The message annunciations contained in the PRD60 are not FAA-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.

PS Engineering
PRD60 Remote DRAWS Unit
Installation and Operator’s Manual
200-160-0200 Page 1-2 Rev 3, Sept. 2012
This device must accept any interference received, including interference that may cause
undesired operation.
1.5 SPECIFICATIONS
Specifications
ENVIRONMENTAL CONDITIONS:
Temperature Range:
Operating:
Storage:
-15º C to 55º C
-40º C to 85º C
Altitude:
Up to 50,000 feet in an unpressurized area of
the aircraft.
DIMENSIONS:
Height: 1.25 in. Length: 5.5 in
Width: 4.0 in . (w/ mounting flanges)
WEIGHT (With Connector):
8.5 Oz. (0.34 kg)
POWER REQUIREMENTS
Voltage:
11 to 33 VDC
Maximum Current:
750 mA (Externally protected by a 1 Amp
circuit breaker.)
Audio Specifications
Audio selector panel input impedance:
510 
Input Isolation:
-60 dB (min.)
Unswitched Audio:
4 inputs
Headphone Impedance:
150 - 1000 
Headphone Output:
38 mW into headset, no clipping into 150
Distortion:
<1% THD @ 38 mW into 150
Audio Freq. Response, 3 dB:
300 Hz - 6000 Hz
1.6 EQUIPMENT SUPPLIED
1 ea. of the following units:
Model
Part Number
PRD60
050-160- ( )

PS Engineering
PRD60 Remote DRAWS Unit
Installation and Operator’s Manual
200-160-0200 Page 1-3 Rev 3, Sept. 2012
PRD60 Installation Material:
Part Number
Description
Quantity
625-025-0010
DB25 Female Shell
1
425-025-0001
Back shell
1
425-020-5090
Crimp Pins
25
200-160-0200
Operator's and In-
stallation Manual
Internet Availability
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED
Circuit Breaker: 1 ea. 1 amp.
Input system (i.e. engine monitoring system)
Interconnect Wiring
1.8 LICENSE REQUIREMENTS
None

PS Engineering
PRD60 Remote DRAWS Unit
Installation and Operator’s Manual
200-160-0200 Page 2-1 Rev 3, Sept. 2012
Section II - Installation
2.1 GENERAL INFORMATION
2.1.1 SCOPE
This section provides detailed installation and interconnect instructions for the PS Engi-
neering PRD60 Remote Aural Warning System.
Please read this manual carefully before beginning any installation to prevent damage and
post-installation problems. Installation of this equipment requires special tools and
knowledge.
NOTE: An appropriately rated Certified Aircraft Repair Station must install this equip-
ment 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.
2.1.2 Certification Requirements
When the digital audio warning system is installed in a certified aircraft, certification ba-
sis is the installer’s responsibility. Due to the variety and options available for interface,
PS Engineering, will only provide manufacturers data for our equipment interface. Con-
tact PS Engineering for more details.
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. 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 re-
turned to PS Engineering for any other reason should be shipped in the original PS Engi-
neering packaging, or other UPS approved packaging.
2.3 Equipment Installation Procedures
2.3.1 Cooling Requirements
Forced air cooling of the PRD60 is not required. However the unit should be kept away
from heat producing sources (i.e. defrost or heater ducts, dropping resistors, heat produc-
ing avionics) without adequate cooling air provided.

PS Engineering
PRD60 Remote DRAWS Unit
Installation and Operator’s Manual
200-160-0200 Page 2-2 Rev 3, Sept. 2012
2.3.2 Mounting Requirements
The PRD60 must be rigidly mounted to the aircraft structure. Installation must comply
with FAA Advisory Circular AC 43.13-2A. The unit may be mounted in any area where
adequate clearance for the unit and associated wiring bundle exist. The unit may be
mounted in any position or orientation.
Avoid installing the PRD60 close to high current devices or systems with high-voltage
pulse type outputs, such as DME or transponders.
To install the PRD60, select a location convenient to the warning panel providing the
output, and the audio panel. The unit may be installed in any position, on a surface that
will allow for installation in accordance with AC43-13-2A.
2.3.3 Connector Assembly
The unit connector is a male DB25 connector. This is a crimp-type connector. These are
crimp-type connectors. The AMP Contact Crimping Tool, AMP 601966-1 (or MS22520
equiv.), with Positioning Tool 601966-5 must be used to ensure good quality harness.
Ensure that proper strain relief and chafing precautions are made during wiring and instal-
lation.
2.4 Cable Harness Wiring
Referring to the Appendix, assemble a wiring harness as required for the installation. All
wires must be MIL-SPEC in accordance with current regulations. Two- and three-
conductor shielded wire must be used where indicated, and be MIL-C-27500 or equiva-
lent 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 43.13-2A 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 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.
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 airframe that are detected by the audio system. Follow
the wiring diagram very carefully to help ensure a minimum of ground loop potential. Use
only Mil Spec shielded wires (MIL-C-275000, or better).
Radiated signals can be a factor when low level audio signals are "bundled" with current
carrying power wires. Keep these cables physically separated.

PS Engineering
PRD60 Remote DRAWS Unit
Installation and Operator’s Manual
200-160-0200 Page 2-3 Rev 3, Sept. 2012
2.4.2 Power (Pin 25)
The PRD60-Series are compatible with both 14 and 28 Volt DC systems. A one (1) Amp
circuit breaker is required. Power and ground wires must be a minimum #20 AWG pair.
Connect airframe power ground to Pin 13 only.
2.4.3 Audio Message Installation
The audio message installation requires inputs from an external source, such as an engine
gage system. A falling edge (input pulled low) when applied to the appropriate pin of the
connector will cause the message to be played, repeating every two seconds, until the
acknowledge (“ACK”) button is pushed.
The message input trigger should have no more than 28 VDC in the high (open) state, and
must be pulled to < 1.0 VDC (but not below ground) in the low, or triggered state. Maxi-
mum sink current, 5 mA.
Install the “ACK” button in a location convenient to the pilot and copilot position. This
switch is a momentary SPST switch between Pin 24 and ground.
The following table contains information regarding various inputs:
Function
EGT or
CHT
Fuel
Flow or
Level
Oil Pressure
or tempera-
ture
Volt/
Amp
RPM
Manifold
Pressure
Message
Number
1
2
3
4
5
6
PRD60 Pin
23
11
9
10
21
8
Message
Text Part
number
-0200 only
“Check
temperature”
“Check
fuel”
“Check oil”
“Check
battery”
“Check
engine
speed”
“Check
boost”
Other combinations can be created at additional cost.
NOTE: PS Engineering can only provide input information at this time. Approval basis is
the responsibility of the installer. Contact PS Engineering for more information.
2.4.4 Unswitched Inputs (Pins 3, 4, 15, and 16)
Four 510unswitched inputs are provided for audio summing on pins 3, 4, 15, and 16
with respect to (WRT) pin 18. These can be used to add audio capability such as TAWS,
autopilot audio, etc, to an audio panel that only has two inputs. The output is on Pin 14.
2.4.5 Headset wiring
The output of the PRD60 is usually presented to the pilot’s headset only, and only the left
ear in a stereo installation. It is critical to the proper operation of this system to have this
connector wiring made in accordance with these diagrams. Use 2- and 3-conductor, MIL-

PS Engineering
PRD60 Remote DRAWS Unit
Installation and Operator’s Manual
200-160-0200 Page 2-4 Rev 3, Sept. 2012
spec cable as shown. Connect the shields at one end only, and tie to the audio low inputs
as shown.
2.5 Adjustments
The PRD60 is factory adjusted to accommodate the typical requirements for most aircraft
configurations. The output volume can be adjusted using Audio Adjustment pot. See Ap-
pendix B for locations
2.6 Post Installation Checkout
After wiring is complete, verify power is ONLY on pin 25 of the J1 connector, and air-
frame ground on pin 13. Failure to do so will cause serious internal damage and void PS
Engineering's warranty.
2.6.1 Operational Checkout
Apply power to the aircraft and avionics. Verify that the aural alerts are all off. There is a
five second delay in the system after power up, during this time the unit will ignore any
input triggers. This allows aircraft systems to “settle” after power-up, without nuisance
alerts.
2.6.2 Digital Annunciation Checkout
If interfaced with an annunciation system, verify that all alert messages play at the appro-
priate time, and that they are silenced by the “ACK” button.
2.7 Final Inspection
Verify that the wiring is bundled away from all controls and no part of the installation in-
terferes with aircraft control operation. Move all controls through their full range while
examining the installation to see that no mechanical interference exists. Verify that the
cables are secured to the aircraft structure in accordance with good practices, with ade-
quate strain relief. Ensure that there are no kinks or sharp bends in the cables and coaxial
cables. Verify that the cables are not exposed to any sharp edges or rough surfaces, and
that all contact points are protected from abrasion.
Complete log documentation, weight and balance computation and other documentation
as required. Sample instructions for continuing airworthiness can be found in §6.1.
Return completed warranty registration application to PS Engineering.

PS Engineering
PRD60 Remote DRAWS Unit
Installation and Operator’s Manual
200-160-0200 Page 3-1 Rev 3, Sept. 2012
Section III OPERATION
GENERAL INFORMATION
3.1 Scope
This section provides detailed operating instructions for the PS Engineering PRD60, Part
Number 050-160-0100, Remote Aural Warning System andPRD60 050-160-0200 Digital
Aural Warning System. Please read it carefully before using the equipment so that you
can take full advantage of its capabilities.
3.2 Audio Messaging system
The PRD60 contains six stored messages. An outside annunciator, such as an engine gage
system triggers these messages. When there is an announcement, it will be repeated every
two seconds until the remote- mounted ACK button is pushed. This stops the played an-
nunciation, until the next announcement is required (the next falling edge).