Nat PIA01-001 User manual

Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna, BC, Canada.
V1Y 4N7
Telephone [phone]
Facsimile [phone]
Issued on the authority of Northern Airborne Technology Ltd.
Copyright 2010
Installation and Operation Manual
PIA01-001
Passenger Intercom Amplifier
SM78
ISSUE 1.00

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Installation and Operation Manual Page ii
ENG-FORM: 820-0115.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Prepared By: Checked By: Certification: Approved By:
The status of this installation and operation manual is controlled by issue shown on the title page. The
status of each section is controlled by revision shown in the footer of each page. All revisions affecting
sections of this manual have been incorporated into the latest issue.
ISSUE/REVISION RECORD
Manual Issue
Number Section Revision Number Revision Description Issue Date
1.00 Section 1 Rev: 1.00
Section 2 Rev: 1.00
Section 3 Rev: 1.00
Initial release Mar 15, 2010

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Installation and Operation Manual Page iii
ENG-FORM: 820-0115.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Table of Contents
Section Title Page
1. Description
1.1 Introduction 1-1
1.2 Product Description 1-1
1.3 Design Features 1-1
1.4 Specifications 1-2
1.4.1 Electrical Specifications 1-2
1.4.2 Physical Specifications 1-5
1.4.3 Environmental Specifications 1-6
1.4.4 Product Approval 1-6
2. Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.2.1 Warranty 2-1
2.3 Continued Airworthiness 2-1
2.4 Installation Procedures 2-1
2.4.1 Warnings 2-2
2.4.2 Cautions 2-2
2.4.3 Mounting 2-3
2.4.4 Cabling and Wiring 2-3
2.4.5 Post Installation Checks 2-6
2.5 Adjustments and Connections 2-6
2.6 Accessories Required But Not Supplied 2-7
2.7 Installation Drawings 2-7
3. Operation
3.1 Introduction 3-1
3.2 General Information 3-1

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 1 Page 1-1
ENG-FORM: 800-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section 1 Description
1.1 Introduction
Information in this section consists of product description, design features and specifications for the
PIA01-001 Passenger Intercom Amplifier (PIA01). All derivative product information shall be contained in
the applicable manual supplement, which may be obtained from Northern Airborne Technology Ltd. as
required.
Review all notes, warnings and cautions.
Note: This manual contains information applicable to units MOD 4 and above.
1.2 Product Description
The PIA01 is a remote mounted Passenger Intercom Amplifier that supports up to twelve passengers
together on one intercom system (six headset connections on the PIA01, each supporting two headsets
in parallel, if desired). Expansion capabilities are provided through either an analog or digital ICS Tie Line
connection. Only one of these ICS Tie Lines is operational at any given time.
1.3 Design Features
The PIA01 has a number of configurable system parameters providing flexibility for customized
applications. The PIA01 can be configured to support one of three microphone impedances and one of
three headphone impedances. The microphone and headphone impedances selected will apply to all of
the PIA01 users. The headphone outputs will support mono headsets. The microphone audio is
summed together as one group.
The PIA01 is initially intended for application with the Northern Airborne Technology (NAT) Digital Audio
Communication System (DACS). In this configuration, the PIA01 provides intercom audio with the
passengers of the Audio Management Unit (AMU) within the DACS system via the digital ICS Tie Line.
The PIA01 communicates with the AMU using a serial data port. All intercom audio between the PIA01
and AMU is digitized and passed over the serial data port. When used with the DACS, the PIA01 system
parameters are configured using a Personal Computer (PC) connected to the AMU via a Universal Serial
Bus (USB) serial port and NAT supplied DACS Device Configuration software. The PIA01 intercom audio
level and VOX level matches the corresponding levels heard by the passengers connected to the AMU.
The PIA01 can also be used as a stand-alone Passenger Intercom Amplifier. In this configuration, the
PIA01 enables the analog ICS Tie Line for intercom communication with external devices. Microphone
and headphone impedances are selected via discrete inputs on the PIA01 external connector. Intercom
audio and VOX levels are adjusted via discrete inputs on the PIA01 external connector.
The PIA01 also features a stereo music input. The stereo signal is summed to a mono signal and routed
to all headphone outputs. The music input level is configurable to support portable or automotive input
levels via discrete inputs on the PIA01 external connector.

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 1 Page 1-2
ENG-FORM: 800-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
1.4 Specifications
1.4.1 Electrical Specifications
Input Signals
Input Power
Normal Operating Conditions:
Nominal: +28.0 Vdc
Maximum: +30.3 Vdc
Minimum: +22.0 Vdc
Emergency: +18.0 Vdc
Abnormal Operating Conditions:
Maximum: +32.2 Vdc
Minimum: +20.5 Vdc
Input Current: 2.0 A maximum @ 28.0 Vdc
Microphones (PAX1 MIC through PAX6 MIC)
Three microphone impedances are available. All microphone inputs are configured to the same
impedance setting via the digital ICS Tieline (digital mode) or jumper settings (analog mode).
Quantity: 6
Gain Adjustable from -9 dB to +6 dB of nominal input level, +/- 1dB
with 15 steps of adjustment (digital mode only).
Microphone (Type One) dynamic
Rated Level: 250 µVrms nominal to produce rated headphone output
Impedance: 5 Ω±30%
Circuitry Type: differential
Microphone (Type Two) dynamic
Rated Level: 850 µVrms nominal to produce rated headphone output
Impedance: 75 Ω±30%
Circuitry Type: differential
Microphone (Type Three) amplified dynamic/electret
Rated Level: 250 mVrms nominal to produce rated headphone output
Impedance: 150 Ω±10%
Circuitry Type: single ended
Mic Bias: 24 mA (TSO configuration)
Stereo Music (MUSIC R and MUSIC L)
Quantity: 1
Lo Level Input: 400 mVrms +/-10%
Hi Level Input: 2.5 Vrms +/-10%
Input Impedance: 1 kΩ±10%
Circuitry Type: differential

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 1 Page 1-3
ENG-FORM: 800-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
ICS Keylines (PAX1 ICS KEY through PAX6 ICS KEY)
Quantity: 6
Logic: active LO, no external pull up required
Input Active: ≤+3 Vdc
Maximum Current: ≤10 mA
Input Protection: diode protected to +45 Vdc maximum
Headphone Impedance Discrete Input (PHN IMPEDANCE)
Quantity: 1
8 Ω: Logic: active HI, no external resistor required
Input Active: ≥+17.5 Vdc
Maximum Current: ≤15 mA
Input Protection: diode protected to +45 Vdc maximum
150 Ω: Logic: active Floating
Input Active: No connection
Maximum Current: N/A
Input Protection: diode protected to +45 Vdc maximum
600 Ω: Logic: active LO, no external pull up required
Input Active: ≤+3 Vdc
Maximum Current: ≤10 mA
Input Protection: diode protected to +45 Vdc maximum
Microphone Impedance Discrete Input (MIC IMPEDANCE)
Quantity: 1
5 Ω: Logic: active HI, no external resistor required
Input Active: ≥+17.5 Vdc
Maximum Current: ≤15 mA
Input Protection: diode protected to +45 Vdc maximum
75 Ω: Logic: active Floating
Input Active: No connection
Maximum Current: N/A
Input Protection: diode protected to +45 Vdc maximum
150 Ω: Logic: active LO, no external pull up required
Input Active: ≤+3 Vdc
Maximum Current: ≤10 mA
Input Protection: diode protected to +45 Vdc maximum
ICS Tie Line Load Discrete Input (NAT ICS LEVEL)
Quantity: 1
2 Loads: Logic: active LO, no external pull up required
Input Active: ≤+3 Vdc
Maximum Current: ≤10 mA
Input Protection: diode protected to +45 Vdc maximum
4 Loads: Logic: active Floating
Input Active: No connection
Maximum Current: N/A
Input Protection: diode protected to +45 Vdc maximum

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 1 Page 1-4
ENG-FORM: 800-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Music Level Discrete Input (MUSIC LEVEL)
Quantity: 1
Lo level: Logic: active LO, no external pull up required
Input Active: ≤+3 Vdc
Maximum Current: ≤10 mA
Input Protection: diode protected to +45 Vdc maximum
Hi level: Logic: active Floating
Input Active: No connection
Maximum Current: N/A
Input Protection: diode protected to +45 Vdc maximum
Intercom Volume Discrete Input (VOLUME INC/VOLUME DEC)
Quantity: 2
VOL INC: Logic: active LO, no external pull up required
Input Active: ≤+3 Vdc
Maximum Current: ≤10 mA
Input Protection: diode protected to +45 Vdc maximum
VOL DEC: Logic: active LO, no external pull up required
Input Active: ≤+3 Vdc
Maximum Current: ≤10 mA
Input Protection: diode protected to +45 Vdc maximum
VOX Level Discrete Input (VOX INC/VOX DEC)
Quantity: 2
VOX INC: Logic: active LO, no external pull up required
Input Active: ≤+3 Vdc
Maximum Current: ≤10 mA
Input Protection: diode protected to +45 Vdc maximum
VOX DEC: Logic: active LO, no external pull up required
Input Active: ≤+3 Vdc
Maximum Current: ≤10 mA
Input Protection: diode protected to +45 Vdc maximum
Output Signals
Headphones (PAX1 PHONES through PAX6 PHONES)
Three impedances are available. All headphone outputs are configured to the same impedance
setting via the Digital ICS Tieline (digital mode) or jumper setting (analog mode).
Quantity: 6 mono headphone outputs
Rated Output: ≥250 mW into rated load
Circuitry Type: balanced
Headphone (Type One)
Load Impedance: 8 Ω±10%
Output Impedance: ≤2.25 Ω
Headphone (Type Two)
Load Impedance: 150 Ω±10%
Output Impedance: ≤20 Ω

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 1 Page 1-5
ENG-FORM: 800-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Headphone (Type Three)
Load Impedance: 600 Ω±10%
Output Impedance: ≤60 Ω
Bi-Directional Signals
Digital ICS Tie Line (ICS TIE TX/ICS TIE RX)
Serial Data Port:
Quantity: 1
Specification: RS422
Serial Data Protocol: S/PDIF
Analog ICS Tie Line (NAT ICS TIE)
Quantity: 1
Port Impedance: 2 kΩ±15%
Rated Level: 230 mVrms nominal, (2 loads)
136 mVrms nominal, (4 loads)
Circuitry Type: balanced
1.4.1.1 Audio Performance
The PIA01-001 meets the requirements of FAA TSO-C139 and RTCA/DO-214 Class Ib.
Audio Frequency Response: <3dB from 300 - 6000Hz
Volume Controls: 40dB of adjustment (intercom audio)
Crosstalk: >55dB attenuation from rated output power for input to output
crosstalk and bleedthrough.
>60dB attenuation from rated input level for input to input
crosstalk (except for stereo Music left and right channel inputs).
1.4.2 Physical Specifications
Height: 34.3 mm (1.35 in) maximum
Depth: 201.9 mm (7.95 in) maximum
Width: 168.9 mm (6.65 in) maximum including flanges
Weight: 0.72 kg (1.65 lbs.) maximum
Material and Finish: Brushed aluminium, conversion coated
Connectors: 1 x 50 pin D-Sub, male; Jackpost locking hardware
Installation: RS-422 Cable: 20.0 m (785.9 in) maximum
MIC Cable: 5.0 m (196.7 in) maximum
PHN Cable: 5.0 m (196.7 in) maximum
Mounting: Bulkhead Mount (four 10-32 screws)

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 1 Page 1-6
ENG-FORM: 800-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
1.4.3 Environmental Specifications
The PIA01-001 has been tested to the environmental conditions listed below. Environmental categories
for which TSO compliance has been demonstrated are listed on the Environmental Qualification Form in
Section 2 of this manual.
Temperature: -40 to +70°C (Operating)
-45 and +85°C (Short Time Operating)
-55 to +85°C (Ground survival)
Altitude: 50,000 feet max
Humidity: 95% non-condensing
Shock: Operational Shock; 6 g for 11 ms
Crash Safety (impulse); 20 g for 11 ms
Crash Safety (sustained); 20 g for 3 s
Vibration: RTCA/DO-160E category [(SBM)(U2FF1)]
1.4.4 Product Approval
Refer to section 2.4.2 Cautions (Installation Limitations) for details of limitations required for TSO-C139
compliance.
FAA: TSO-C139 (RTCA/DO-214 Class Ib, RTCA/DO-160E, RTCA/DO-178B Level D)
This TSO approval is only applicable to units incorporating MODs 1-4 inclusive and higher.
Section 1 ends

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 1 Page 2-1
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section 2 Installation
2.1 Introduction
Information in this section consists of unpacking and inspection procedures, installation procedures,
post-installation checks and installation drawings for the PIA01-001 Passenger Intercom Amplifier.
Review all notes, warnings and cautions.
2.2 Unpacking and Inspection
Unpack the equipment carefully and locate the warranty card. Inspect the unit visually for damage due to
shipping and report all such claims immediately to the carrier involved. Check that all items listed below
are present before proceeding and report any shortage immediately to your supplier:
- Warranty Card
- Certificate of Conformity or Release Certification
2.2.1 Warranty
All Northern Airborne Technology Ltd. products are warranted for 2 years from date of installation by an
authorized Northern Airborne Technology Ltd. dealer, to be free of defects in workmanship or
performance. This warranty covers all materials and labour, but is exclusive of any transport to deliver the
defective unit to and from Northern Airborne Technology Ltd. or its designated warranty repair center, or
any labour to remove or re-install the defective unit in the aircraft. Contact Northern Airborne Technology
Ltd. for any questions regarding this warranty, its applicability to your units and/or for return authorization.
Northern Airborne Technology Ltd. is the final arbitrator concerning warranty administration. Units which
have been physically damaged, burned, immersed in water or otherwise abused beyond the scope of
normal use will not be considered for warranty. WARRANTY IS VOID UNLESS THE PRODUCT IS
INSTALLED BY AN AUTHORIZED NORTHERN AIRBORNE TECHNOLOGY LTD. DEALER. Product
for which a warranty card is not returned shall be warranted from date of manufacture.
2.3 Continued Airworthiness
Maintenance of the PIA01-001 Passenger Intercom Amplifier is ‘on condition’ only. Periodic maintenance
of this product is not required.
2.4 Installation Procedures
Installation Notice
This product must be installed in accordance with the installation instructions provided in the latest issue
of this Installation and Operation Manual. Check the Publication Index at www.northernairborne.com for
the issue status of the manual. The latest issue of the manual may be downloaded from the same
website. All risk associated with installation of this product contrary to these instructions shall be the
responsibility of the installing agency.

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 1 Page 2-2
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.1 Warnings
WARNING:
High volume settings can cause hearing damage.
Set the headset volume control to the minimum setting prior to
conducting tests, and slowly increase the volume to a comfortable
listening level.
2.4.2 Cautions
CAUTION:
Do not bundle any lines from this unit with transmitter coax feed lines. Do not
bundle any logic, audio, or DC power lines from this unit with 400 Hz synchro
wiring or AC power lines. Do not position this unit next to any device with a
strong alternating magnetic field such as an inverter, motor or blower, or
significant audio interference will result.
In all installations, use shielded cable exactly as shown, and ground only as
indicated. Significant problems may result from not following these guidelines.
Failure to follow the installation and wiring instructions provided in this manual
for power and ground connections, including the rating of the circuit breaker,
may lead to damage in the power input circuitry of the unit.
CAUTION:
Installation Limitations
1. Approval Settings
The PIA01 has only been tested to demonstrate compliance with the
requirements of TSO-C139 with the installation settings listed below.
Settings other than those listed are not approved.
Item Setting
Microphone Impedance 150 Ohm
Headphone Impedance 150 Ohm
These settings are applied by connector pin strapping (analog mode) or via
the digital ICS Tieline (digital mode).
2. Software Approval
A deviation to TSO-C139 has been granted by the FAA to allow the
software to be developed to RTCA/DO178B Level D in lieu of Level C. As
a result the PIA01 must not be used for flight crew intercommunication
or radio communication functions. Provision must be available in the
aircraft audio system to permit the flight crew to disconnect audio from
the PIA01 from their headphone audio.

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 1 Page 2-3
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.3 Mounting
The PIA01 can be bulkhead mounted in any orientation using four 10-32 screws. No shock or vibration
isolators are required.
The PIA01 must be mounted to a clean metal surface which is electrically bonded to the aircraft ground
plane. The unit is finished with a coating which prevents corrosion. This film is electrically conductive and
should not be removed for electrical bonding.
2.4.4 Cabling and Wiring
All wire shall be selected in accordance with the original aircraft manufacturer's Maintenance Instructions
or AC43.13-1B Change 1, Paragraphs 11-76 through 11-78. Unshielded wire types shall qualify to
MIL-W-22759 as specified in AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11.
For shielded wire applications, use Tefzel MIL-C-27500 shielded wire with solder sleeves (for shield
terminations) to make the most compact and easily terminated interconnect. Follow the connector map in
Section 2.7 as required.
Allow 3" from the end of the shielded wiring to the shield termination to allow the connector hood to be
easily installed. Reference the interconnect drawing in Section 2.7 for shield termination details. Note that
the hood is a 'clamshell' hood, and is installed after the wiring is complete.
Maintain wire segregation and route wiring in accordance with the original aircraft manufacturers
Maintenance Instructions.
Unless otherwise noted, all wiring shall be a minimum of 22 AWG, except power and ground lines, which
shall be a minimum of 20 AWG. Reference the Interconnect drawing for additional specifications. Check
that the ground connection is clean and well secured, and that it shares no path with any electrically noisy
aircraft accessories such as blowers, turn and bank instruments or similar loads. Power to this unit must
be supplied from a separate circuit breaker or fuse (fast blow), and not attached to any other circuit
breaker without additional protection. Verify that the selected circuit breaker size and wire gauge are
adequate for the installation using the techniques specified in AC43.13-1B Change 1, Paragraphs 11-47
through 11-51 and 11-66 through 11-69.
2.4.4.1 Interconnect Discretes
2.4.4.1.1 Intercom Volume Input (VOLUME INC / VOLUME DEC)
The PIA01 has two Intercom Volume Inputs for adjusting the Intercom Audio Level at the headphone
outputs. Each activation of the volume switch causes one volume level change of 2 dB. On power-up the
volume level defaults to maximum.
These inputs are only active when the PIA01 is operating in analog mode. In digital mode the PIA01
Intercom Volume level is controlled by data on the Digital ICS Tieline.

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 1 Page 2-4
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.4.1.2 VOX Level Input (VOX INC / VOX DEC)
The PIA01 has two VOX Level Inputs for adjusting the VOX threshold for all users. Each activation of the
VOX switch causes one VOX level change of 2 dB. On power-up the VOX level defaults to approximately
10 dB above the minimum setting. The maximum setting is for keyed ICS operation; the users ICS Key
switch must be activated to talk on the intercom.
These inputs are only active when the PIA01 is operating in analog mode. In digital mode the PIA01 VOX
level is controlled by data on the Digital ICS Tieline.
2.4.4.1.3 Headphone Impedance Input (PHN IMPEDANCE)
The PIA01 has one Headphone Impedance Input for selecting the headphone impedance setting for all
users. Three settings are available, alternate impedance with the input grounded, standard impedance
with the input open circuit, and low impedance with the input connected to 28V dc. For TSO approval this
input must be open circuit.
This input is only active when the PIA01 is operating in analog mode. In digital mode the PIA01
Headphone Impedance setting is controlled by data on the Digital ICS Tieline.
2.4.4.1.4 Microphone Impedance Input (MIC IMPEDANCE)
The PIA01 has one Microphone Impedance Input for selecting the microphone impedance setting for all
users. Three settings are available, standard impedance with the input grounded, alternate impedance
with the input open circuit, and low impedance with the input connected to 28Vdc. For TSO approval this
input must be connected to ground.
This input is only active when the PIA01 is operating in analog mode. In digital mode the PIA01
Microphone Impedance setting is controlled by data on the Digital ICS Tieline.
2.4.4.1.5 ICS Tieline Load Input (NAT ICS LEVEL)
The PIA01 has one ICS Tieline Load Input for selecting the number of ICS Tieline loads on the Analog
ICS Tieline. Two settings are available, two loads and four loads.
This input is only active when the PIA01 is operating in analog mode. In digital mode the PIA01 the
Analog ICS Tieline does not operate.
2.4.4.1.6 Music Level Input (MUSIC LEVEL)
The PIA01 has one Music Level Input for selecting the level setting for the Music Input. Two settings are
available, low level with the input grounded, and high level with the input open circuit.
This input is only active when the PIA01 is operating in analog mode. In digital mode the PIA01 Music
Input Level is controlled by data on the Digital ICS Tieline.

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 1 Page 2-5
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.4.2 Interconnect Audio
2.4.4.2.1 Microphone Inputs
The PIA01 has six Microphone Inputs. Each Microphone Input has independent VOX operation, an
independent user ICS Key input, and can support one or two microphones connected in parallel. With two
microphones connected operation may be degraded; TSO minimum performance standard operation has
only been demonstrated with one microphone connected to each Microphone Input.
2.4.4.2.2 Headphone Outputs
The PIA01 has six mono Headphone Outputs. Each Headphone Output can support one or two
headphones connected in parallel. With two headphones connected operation may be degraded; TSO
minimum performance standard operation has only been demonstrated with one headphone connected to
each Headphone Output.
2.4.4.2.3 Stereo Music Input
The PIA01 has one Stereo Music Input. The MUSIC L and MUSIC R inputs are summed together inside the
PIA01 to provide a monaural music audio to all headphone outputs. The music is not included in the audio
signal on the ICS Tieline. The music is muted to the headphones whenever a user is talking on the intercom.
2.4.4.2.4 ICS Tieline
The PIA01 can support ICS communications with an external device on either an analog or a digital
tieline, but not both.
2.4.4.2.4.1 ICS Mode
The PIA01 operates in either Digital mode or Analog mode depending on the availability of ICS Tieline
signals. On power-up the PIA01 will default to analog mode operation, but continuously looks for a signal
on the digital ICS tieline input. If the PIA01 detects a valid signal on the digital ICS tieline input it will enter
digital mode; if the PIA01 loses the signal on the digital ICS tieline it will remain in digital mode using the
configuration settings last received from the digital ICS tieline.
Note: The digital and analog modes only describe the ICS tieline interface. Internally the unit processes
audio digitally in both modes.
2.4.4.2.4.2 Analog ICS Tieline
The Analog ICS Tieline can be configured to support standard NAT analog audio products. Refer to the
interconnect drawing in section 2.7 to ensure that the tieline loading is correct.
The Analog ICS Tieline is disabled when the PIA01 is operating in digital mode.
2.4.4.2.4.3 Digital ICS Tieline
The Digital ICS Tieline allows connection of the PIA01 to one external device. The PIA01 sends digital
audio to the external device, and receives digital audio and configuration data from the external device.

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 1 Page 2-6
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.5 Post Installation Checks
2.4.5.1 Voltage/Resistance Checks
Do not attach the PIA01 until the following conditions are met.
Check the following:
a) Check pin <1> for +28 Vdc relative to ground.
b) Check pin <34> for power ground (less than 0.5Ω).
c) Check pin <18> for chassis ground (less than 0.5Ω).
d) Check pins <2> <19> <35> and <36> for ground (less than 0.5Ω) when the appropriate switches are
closed.
e) Check pins <37> <38> <39> <40> <41> and <42> for ground (less than 0.5Ω) when the appropriate
switches are keyed.
f) Check pins <44> for MIC impedance ground (less than 0.5Ω).
g) Check pin <49> for ground (less than 0.5Ω) when 2 NAT loads is selected.
h) Check pin <27> for ground (less than 0.5Ω) when music level LO is selected.
2.4.5.2 Power On Checks
WARNING:
High volume settings can cause hearing damage.
Set the headset volume control to the minimum setting prior to
conducting tests, and slowly increase the volume to a comfortable
listening level.
Power up the aircraft’s systems and verify normal operation of all functions of the PIA01.
Upon satisfactory completion of all functional/operational checks, make all required log book entries,
electrical load, weight and balance amendments and other documentation as required by your local
regulatory agency.
2.5 Adjustments and Connections
When installed in an audio communications system such as the Northern Airborne Technology Ltd DACS,
all adjustments are made through the DACS Device Configuration Software (DevCs) application. Refer to
the SM76 AMU50-001 Audio Management Unit Installation and Operation Manual and the DevCs
Installation and Operation manual for information on connection and operation of the DevCs.

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 1 Page 2-7
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.6 Accessories Required But Not Supplied
Installation kit p/n PIA01-IKC (crimp) is required to complete the installation. The kit consists of the
following:
Quantity Description Part No.
1 Connector, D-Sub Socket, Crimp 50 pin Housing 20-21-R50
50 Contact Crimp Socket 20-26-901
1 Hood, D-Sub, Metal 20-28-003
1 Shield Termination, Tag Ring 20-30-416
2.7 Installation Drawings
DOCUMENT REV. DESCRIPTION TYPE
PIA01-001
PIA01\001\403-0 1.00 Passenger Intercom Amplifier Interconnect (3 sheets)
PIA01\001\405-0 1.00 Passenger Intercom Amplifier Connector Map
PIA01\001\521-0 1.00 Passenger Intercom Amplifier Environmental Qualification Form
PIA01\001\922-0 1.10 Passenger Intercom Amplifier Mechanical Installation
Section 2 ends following the above documents