Northern Airborne Technology AA95-766 User Manual

SM95-766

AA95-766
Single Channel Audio Controller
Manual

INSTALLATION AND OPERATION MANUAL

REV 2.00 December 6, 2004

Northern Airborne Technology Ltd.

1925 Kirschner Road

Kelowna, BC, Canada.

V1Y 4N7

Telephone [phone]

Facsimile [phone]

Copyright 2004 by Northern Airborne Technology

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM95-766 Rev. 2.00 AA95-766 Single Channel Audio Controller Manual

Periodically NAT will release manual amendments. In order to maintain the most
accurate and up to date manual these amendments should be carried out immediately
upon receipt and recorded on the following amendment record.

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Dec 6, 2004 Page ii

ENG-FORM: 820-0109.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM95-766 Rev. 2.00 AA95-766 Single Channel Audio Controller Manual

Table of Contents

Section Title Page

1 Description

1.1 Introduction 1-1

1.2 Purpose of Equipment 1-1

1.3 Features 1-1

1.4 Specifications 1-2

1.4.1 Electrical Specifications 1-2

1.4.2 Physical Specifications 1-4

1.4.3 Environmental Specifications 1-4

2 Installation

2.1 Introduction 2-1

2.2 Unpacking and Inspection 2-1

2.2.1 Warranty 2-1

2.3 Installation Procedures 2-1

2.3.1 Warnings 2-1

2.3.2 Cautions 2-2

2.3.3 Cabling and Wiring 2-2

2.3.4 Adjustments 2-2

2.3.5 Mechanical Mounting 2-3

2.3.6 Post-Installation Checks 2-3

2.3.7 In-line PTT Cordsets 2-4

2.4 Continued Airworthiness 2-6

2.5 Accessories Required But Not Supplied 2-6

2.6 Installation Drawings 2-7

3 Operation

3.1 Introduction 3-1

3.2 General 3-1

3.3 Controls and Indicators 3-1

3.3.1 Receive Audio Select Switches 3-2

3.3.2 Transmit Selector Switch 3-2

3.3.3 ICS Functions 3-3

3.4 Emergency Operation 3-4

3.5 Direct Audio 3-4

Dec 6, 2004 Page iii

ENG-FORM: 820-0109.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM95-766 Rev. 2.00 AA95-766 Single Channel Audio Controller Manual

Section 1 Description

1.1 Introduction

This manual contains information on the AA95-766 Single Channel Audio Controller.

Information in this section consists of purpose of equipment, features and specifications.

1.2 Purpose of Equipment

The AA95-766 is a Dzus mounted audio panel with built in intercom and lighted
faceplate. The unit provides full headset transmit (TX), receive (RX) and intercom (ICS)
functions for the pilot and co-pilot users. Only intercom and receiver audio are provided
for passengers. The front panel controls permit user adjustment of frequently needed
signals.

The users have control of five transceiver positions, six receiver inputs, and one PA
output. The unswitched inputs are direct audio and tape player.

The AA95-766 supports only one lo-z mic input and five hi-z mic inputs per box. All
phone outputs are hi-z. Connection to other stations in the system is made through the
ICS Tie line. The AA95-766 is plug compatible with most AA95 and AMS40 series NAT
audio panels.

The small size and extensive radio and ICS functions make this unit an excellent choice
for multi-station aircraft.

1.3 Features

Transceiver interfacing for the AA95-766 is accomplished through directly switched
microphones. To ensure maximum radio compatibility, it has a ground-referenced
keyline that incorporates no diodes or other steering components.

Independent control is provided for each audio channel within the controller, allowing
sidetone, ICS audio, and RX audio to be independently set.

The ICS tie line is fully compatible with other NAT systems including the AA80, AA82,
AMS4X and AA9X series units.

Boom mic support is provided for the pilot and co-pilot, with both ICS and TX functions
via cyclic or yoke switching. The AA95-766 has a built-in dynamic microphone amplifier
for an M87-type mic. The Live (Hot Mic) and VOX ICS functionality allow immediate
transmission via these modes without further control panel switching, and immediate
return to ICS operation on completion. The ICS function is achieved using dynamic
noise reduction and active filtering. This provides the clearest possible ICS audio under

Dec 06, 2004 Page 1-1

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

AA95-766 Single Channel Audio Controller Manual SM95-766 Rev. 2.00

high ambient noise conditions by rejecting airframe and wind noise, and passing only
voiceband information.

All audio, except the S/T of the radio in use and the DIRECT AUDIO input signal, is
muted during transmit for clarity. ICS operation allows transmit during any ICS mode by
using the transmit PTT switch.

All switches, relay contacts and external connections are gold plated for maximum
reliability. Switches and relays are sealed. G10-FR flame retardant circuit boards are
postcoated for maximum moisture resistance and corrosion prevention. Relays are
sealed, high vibration rated (50 g shock), dry nitrogen filled units.

1.4 Specifications

1.4.1 Electrical Specifications

Input Power Reverse and over-voltage protection provided.

Voltage 27.5 Vdc Nominal 0.50 A Max.

Lighting 27.5 Vdc @ 160 mA

Input Signals

Channels 5 aircraft transceiver radio inputs

6 navigational receiver inputs

1 direct audio input (Type 'E')

2.5 Vrms/10 mW input signal for full headset output

1 kΩ input impedance

Type 'E' Input
Direct channel Freq. Response ±6 dB from 370 to 2800 Hz

Distortion 1% THD max

Isolation/crosstalk 65 db min

Rated Level Direct Audio 10 mW (10 dBm) into 600 Ω

Signal/noise ratio 67 db min. or less than 5 mV into 600 Ω

Quantity 13 receive channels

7 mic channels

Audio level 2.5 Vrms for receiver inputs

0.25 Vrms for copilot and passenger mic inputs

0.25 mVrms for pilot mic input

2.5 Vrms for direct audio input

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM95-766 Rev. 2.00 AA95-766 Single Channel Audio Controller Manual

Impedance 1 kΩ ±10% for receive inputs

1 kΩ ±10% for copilot and passenger mic inputs
(150 Ω amplified dynamic Industry standard 'carbon

equivalent' type. 250 mVrms for rated output)

5 ±1 Ω for pilot mic input (5 Ω dynamic Military
M87 or equivalent, 0.1 to 1.0 mVrms 250 uVrms
for rated output)

1.3 kΩ ±10% for Direct Audio input

Circuitry Type All are single ended inputs.

Coupling <-50 dB

Key lines Pilot & copilot transmit PTT
Rear hand mic transmit PTT
Pilot & copilot ICS PTT

Output Signals:

Quantity 6 Headphone outputs

6 Transmitter mic outputs

5 Transmitter keyline outputs

Headset Rated level 12.3 Vrms or 250 mW (24 dBm) into 600 Ω

Circuitry Type Single-ended, except for phones, which are

balanced.

Freq. Response

Sidetone <6 dB from 370 Hz to 2800 Hz

Receive inputs <6 dB from 370 Hz to 2800 Hz

Intercom <6 dB from 350 Hz to 2000 Hz

Distortion <10% THD @ rated power output

Audio Noise Level >50 dB down from rated output (no signal)

Coupling <-50 dB

Output Regulation at 400%
and 75% of rated load.

<10% distortion
power

/ ∆3 dB max of rated output

Keylines Transmit key is active low
Intercom keyline is active low

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

AA95-766 Single Channel Audio Controller Manual SM95-766 Rev. 2.00

Bi-directional Signals:

Quantity One NAT ICS tie channel

Audio level 0.34 Vrms

Impedance 1.8 kΩ ±10%

Circuitry Type Single ended

Miscellaneous:

Annunciators Green LED will light for transmit operation

1.4.2 Physical Specifications{tc "7.2 Physical Specifications"}

Height 1.91” (48.5 mm)

Depth 7.05” (179.1 mm) behind panel

Width 5.78” (146.8 mm)

Weight 2.1 lbs (1.0 kg) excluding harness and mating connectors

Mounting Standard Dzus rails

Connectors One male 50-pin and one male 37-pin D-min connector

1.4.3 Environmental Specifications{tc "7.3 Environmental Specifications"}

Operating Temp -40° C to +70° C

Survival Temp -55° C to +85° C

Vibration/Shock DO-160B category “P”, panel mounting 6g.

Humidity 95% Non-condensing

Altitude 35,000 ft

End of section 1

Page 1-4 Dec 06, 2004

ENG-FORM: 800-0106.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM95-766 Rev. 2.00 AA95-766 Single Channel Audio Controller Manual

Section 2 Installation

2.1 Introduction

Information in this section consists of: unpacking and inspection procedures, installation
procedures, post-installation checks, and installation drawings.

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. Note that each unit should have the following:

- AA95-766 Single Channel Audio Controller

- Warranty Card

- Release certification

Verify that all items are present before proceeding and report any shortage immediately
to your supplier.

2.2.1 Warranty

Complete the warranty card information and send it to NAT when the installation is
complete. If you fail to complete the warranty card, the warranty will be activated on
date of shipment from NAT.

Note: An appropriately rated facility, e.g. Certified Aircraft Repair Station, must install this

equipment in accordance with applicable regulations. NAT Ltd’s warranty is not
valid unless the equipment is installed by an authorized NAT 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 a non-airworthy installation.

2.3 Installation Procedures

2.3.1 Warnings

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.

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.