Air Comm Systems Six Passenger ICS/Transmit Expansion Unit ACS... User manual

Air Comm Systems Inc.
1640 W. Acoma Blvd., Suite A-118.
Lake Havasu City, AZ 86403
Phone [phone]
FAX [phone]
E-Mail [e-mail]
Air Comm Systems, Inc.
Six (6) Passenger ICS/Transmit Expansion Unit
Installation and Operations Manual
ACS 179A
AirComm
Airborne Audio Products

Air Comm Systems, Inc. Page 2
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Installation
Physical and Operating Specifications Page 3
Physical Dimensions Page 4
Interface Schematic Page 5
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Operation
Operation of the ACS 179A Page 6
Typical System Layout Page 7
n Instruction for Continued Airworthiness
Instruction for Continued Airowrthiness Page 8
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Warranty Information
Air Comm Systems Warranty Page 9
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Supplemental Information
Product Schematics
ACS 179A Installation and Operations Manual
Table of Contents

Air Comm Systems, Inc. Page 3
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Physical Specifications
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Operating Specifications
ACS 179A Installation and Operations Manual
Physical and Operating Specifications
SIZE: 5.750  W WEIGHT: 1.0 lb.
1.875  H
4.550  D w/ connector ILLUMINATION: n/a
MOUNTING: Dzus rail mount or remote mounting using 4 hole configuration.
CONTROLS: Unit slaves off of an existing audio mixer panel, typically a co-pilot
or crew member.
INPUTS: 4 audio inputs. 2 for mixed audio and 2 for the ICS buss. Mixed audio is muted
during transmit and normal ICS. Mixed audio is unmuted during hot ICS operation.
DUTY CYCLE: Continuous POWER REQUIREMENTS: 28V DC +/- 10%
MAXIMUM OPERATING ALTITUDE: 20,000 ft.
OPERATING TEMP. RANGE: -40 C to +85 C (operating), -65 C to +125 C (storage)
CURRENT DRAIN: 20 mA at 28V (standby), 800 mA at 28V (max. signal)
AUDIO OUTPUT: 500 mW into 600 ohms
FREQUENCY RESPONSE: Within 6 db - 300-3000Hz
ICS INPUT IMPEDANCE: 600 ohms
INPUT ISOLATION: Not less than 60 db between mixed audio and ICS buss.
AUDIO MUTING: Not less than 40 db during transmit/ICS (optional)
MIKE SENSITIVITY: 300 mV for rated output
DISTORTION: Less than 10% at 1000 Hz for maximum output

Air Comm Systems, Inc. Page 4
Physical Installation
The ACS 179A is designed to be Dzus or remote mounted and should be installed in the
aircraft using the ACS 179A Installation kit that was included with the unit. The above outline
drawing of the unit with dimensions will facilitate the installation. The ACS 179A Installation Kit
consists of the following:
Two (2) 25 pin AMP D-Subminiature female mating connector complete with crimp pins, hood,
and slidelock.
The connector pin configuration of the ACS 179A rear connector and the recommended wire
size for the aircraft cable harness is shown on the following page.
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Physical Dimension Outline
ACS 179A Installation and Operations Manual
Physical Dimensions

Air Comm Systems, Inc. Page 5
The ACS 179A wiring harness should be constructed of Tefzel aircraft wire (M22759/16 grade). Power
and ground wires should be 20 AWG, and all other wires may be 22 AWG. Shielded wires should be
used where noted. Adequate protection against wear and chafing should be taken by using a braided
cable sleeving or jacket. Before completing installation, verify that all cable connector pins are seated
properly and that the connector is securely mounted to the unit mating connector. Important  please
note the power of the unit before installing; it will be either 14VDC or 28VDC and clearly marked
as such on the units data tag.
Pre-fabricated cable harnesses are available from Air Comm to expedite installation  consult our
sales department for details.
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Connector Schematic
ACS 179A Installation and Operations Manual
Interface Schematic

Air Comm Systems, Inc. Page 6
ACS 179A Installation and Operations Manual
Operations of the ACS 179A
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Description
The ACS 179A is a compact, remote slave unit which provides intercom and receive capability
for up to six (6) aircraft passengers. Additionally, two (2) have transmit capability if desired.
Dip switch programmable.
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Method of Operation
The ACS 179A is slaved to a master Audio Mixer Panel for receiving and transmitting. The
master Audio Mixer is normally a co-pilot or rear-crew member unit. The audio inputs selected
by the master panel will be heard by the ACS 179A.
The ACS 179As transmit and intercom functions are activated using a switch and cord
assembly (such as the Carter Engineering or Comm Innovations models). The switch cord
assembly also provides a volume control for the adjustment of both the intercom and receive
audio. This allows for the independent control of volumes between the passengers and the
Audio Mixer they are slaved to.
Transmitting from the ACS 179A is a two-step process:
1) the desired radio must be selected on the master Audio Mixers mic selector.
2) the switch cord must be placed in the transmit position.
NOTE: When either passenger transmits, the master Audio Mixers microphone is
automatically disconnected. This feature prevents the possibility of there being two
microphones activated simultaneously during the transmit function.
During intercom or transmit operation , the receive audio is muted on the ACS 179A. During
Hot ICS operation the receive audio is unmuted ( each passenger has a separate Hot ICS
switch ).
NOTE: For USFS operation a jumper can be cut on each passenger PC board to disable this
muting function.
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Adjustments
The volume control on the switch cord assembly adjusts both the intercom and the receive
audio. It should be set at a comfortable level on intercom first. Then, if the receive audio
volume is too high or low, it can be adjusted at the radio itself ( i.e. Com, FM, Nav, etc. )
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Unit Compatibility
The ACS 179A is compatible with all Air Comm Audio Mixer Panels.

Air Comm Systems, Inc. Page 7
ACS 179A Installation and Operations Manual
Typical System Layout

Air Comm Systems, Inc. Page 8
ACS 179A Installation and Operations Manual
Instruction for Continued Airworthiness
Instruction for continued airworthiness for Intercom Expansion Unit Model ACS-179A, Drawing No.
3000-000, PMA Approval No. PQ2074NM.
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GENERAL DESCRIPTION:
The ACS-179A Expansion Unit is a remote Dzus mounted unit which is slaved to a variety of audio
mixer panels to provide intercom and transmit capability to cabin passengers.
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PURPOSE:
To provide instructions for the maintenance and inspection of the Air Comm Systems, Inc. Model
ACS-179A Intercom Expansion Unit.
This Manual provides instructions supplementing the aircraft maintenance manual. These
instructions only supersede the aircraft manual in the indicated areas.
n OPERATIONAL CHECK:
The ACS 179A Intercom Expansion Unit should be checked prior to first flight each day per current
operations manual.
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MAINTENANCE:
Check security and condition of Dzus mounted panel(s), check associated wiring harnesses at
periodic inspections such as annual/100 hour IAW FAR43 Appendix D(i).
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On Condition:
Send ACS 179A Intercom Expansion Unit to a qualified repair facility for any repairs. Contact Air
Comm Systems, Inc. Phone [phone] or FAX [phone] for nearest factory authorized
repair facility.

Air Comm Systems, Inc. Page 9
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Warranty Information
ACS 179A Installation and Operations Manual
Warranty Information
Air Comm Systems, Inc. warrants each new product to be free from defective material and
workmanship and agrees to remedy any defect or to furnish a new part in exchange for any defective
unit provided an examination discloses such defect occurred under normal use and service, and
provided the defective unit is delivered to us, with transportation charges prepaid, within 1 year from the
date of acceptance of equipment by the owner. Each unit required and claimed defective must be
returned to:
Air Comm Systems, Inc.
11640 W. Acoma Blvd., Suite A-118
Lake Havasu City, AZ 86403
Phone [phone]
FAX [phone]
E-Mail [e-mail]
This warranty does not extend to any products which have been subjected to misuse, neglect, accident,
or in violation of instructions furnished, nor does it extend to units which have been repaired or altered
outside of our factory except where such repairs are specifically authorized in writing by us.This
warranty is in lieu of all other warranties expressed or implied, and no representative or person is
authorized to assume for us any other liability in connection with the sale of our products.