Eagle P178 User manual

EAGLE COPTERS USA INC.
19717 62nd Avenue South, Suite E101, Kent WA 98032 | Phone: [phone]
FAX [phone] www.eaglecopters.com
P178
AUDIO MIXER
PART 27
INSTALLATION MANUAL
MDL 7001-ML-001 Rev -- STC SR02445SE

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Page 1 of 1

7001-ML-001
Revision --
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Record of Revisions
Revision
Date
Description
--
30 OCT 2014
Initial Release

7001-ML-001
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Master List
DRAWING NO.
TOTAL
SHT
REV
DATE
DESCRIPTION
7001-MI-001
11
--
10/30/14
Modification Instructions
7001-TP-001
8
--
10/30/14
EMI Test Procedure
G13120
1
--
1/13/14
Audio Mixer

7001-MI-001
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Record of Revisions
Revision
Date
Description
--
30 OCT 2014
Initial Release

7001-MI-001
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Table of Contents
1. Scope................................................................................................................................................ 4
2. Abbreviations................................................................................................................................... 4
3. References ....................................................................................................................................... 4
4. General Information ........................................................................................................................ 4
5. Installation ....................................................................................................................................... 5
6. System Wiring .................................................................................................................................. 6
7. System Testing ................................................................................................................................. 9
8. Kit Parts List.................................................................................................................................... 10
9. Specifications ................................................................................................................................. 11
10. Weight and Balance ....................................................................................................................... 11

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1. Scope
These modification instructions are for the installation of the Eagle Copters P178 Failsafe Audio Mixer.
2. Abbreviations
EMI ............ Electro-Magnetic Interference
3. References
7001-TP-001 EMI Test Procedure
4. General Information
4.1 The Audio Mixer provides 3 composite outputs from up to 8 input signals. Channel 1 and
Channel 2 composite outputs are failsafe relay protected for Master Caution or Essential Tones
to ensure that no fault in the system or an electrical bus failure can prevent pass through of
Essential Warnings or Tones. Channels 3 through 8 are for non-essential tones and will drop off
line in case of fault or Avionics Bus failure.
4.2 The P178 Failsafe Audio Mixer removes the need for external relays to ensure Essential Tones
are passed to unswitched inputs on any audio system. The mixer also has internal fault
detection. Upon fault, the relays go to their normally closed (Failsafe) position.
4.3 There are no restrictions as to the quantity of Audio Mixers that are installed. However, it is the
installer’s responsibility to verify that the installation of this device does not interfere with other
installed equipment and to perform an electrical load analysis to verify that the aircraft electrical
buss can support the installation of the Audio Mixer.

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5. Installation
5.1 The Audio Mixer is designed to be mounted in a variety of locations within the airframe,
provided it is protected from the environment. It may be mounted to a deck, bulkhead, tray,
avionics shelf or other structure rated to carry a 0.50 lb load. The exact mounting location is left
to the installer’s discretion provided that the installation of the Audio Mixer does not interfere
with other installed equipment.
5.2 Mount the Audio Mixer using (4) #8-32 screws, washers and locknuts or nutplates.
5.3 When mounting into composite structure, #8-32 potted inserts (not included in kit) should be
used.
5.4 Unless otherwise specified, follow aircraft manufacturer’s standard practices and maintenance
manuals for installation of all hardware.
5.5 Maintain a minimum 2 e/d edge margin for all installed fasteners.
5.6 Refer to Figure 1 for Audio Mixer reference dimensions that may be used when planning the
installation.
Figure 1 Audio Mixer Dimensions

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6. System Wiring
6.1 Unless otherwise specified, follow the aircraft manufacturer’s electrical wiring practices and
maintenance manuals for installation of all system wiring.
6.2 Refer to Figure 2 for cable harness fabrication instructions to connect to the Audio Mixer.
6.3 Ground Audio Shields at ONE end only.
6.4 Unless otherwise noted, all shielded wire is M27500-(ga)TG(n)T14 and all unshielded wire is
M22759/16-(ga)-9, where (ga) is the wire gauge and (n) is the number of wires inside the shield.
6.5 Unless otherwise noted, all wire is 22 GA.
6.6 Route all system cabling through existing cable runs.
6.7 Secure all cabling using nylon cable ties and/or cable clamps using standard practices.
6.8 Cable lengths are dependent on Audio Mixer installation location.
6.9 Notes for Figure 2:

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Figure 2 Cable Wiring

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6.10 Refer to Figure 3 for Audio Mixer pin designation.
Figure 3 Pin Designation

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7. System Testing
Failure to follow these instructions will result in improper operation.
7.1 If the mixer is not powered or is in fault mode (Essential), Input 1 will be connected directly via
relay closure to Output 1D, and Input 2 will be connected directly to Output 2D. It is important
to follow the setup instructions exactly in order for the mixer to work properly in the Essential
Mode.
7.2 The mixer has internal fault detection. Upon fault, the relays go to their normally closed
(Failsafe) position and the FAIL indicator light will illuminate. Optionally, the installer may
connect Pin #10 (pull low) to an external fault indicator (see note #2 in Section 6.9). There are
no internal adjustments, jumpers or user serviceable parts. If the mixer fails, return it to Eagle
Copters USA, Inc. for repair or replacement.
7.3 The direct inputs in essential mode are non-adjustable. The level that is present at Inputs 1 and
2 will be present at 1D and 2D respectively.
7.4 Output 3 is not relay direct protected and therefore will drop off line in unpowered or fail mode.
This output is designed to be a monitor port to a non-critical device.
7.5 Before applying power, perform a continuity check of all leads to confirm they are connected
properly.
7.6 With the circuit breaker to the mixer pulled (Off) and the audio system on, adjust the source to
Audio Source 1D and 2D so that the proper level is heard at both the Pilot and Co-Pilots
Headsets when the source is triggered, i.e. Master Caution. DO NOT adjust the 1D or 2D outputs
of the mixer; instead, adjust the source to the mixer.
7.7 With all other avionics off, push the mixer's circuit breaker In (On). Verify visually that the power
indicator (PWR) is on, and the FAIL indicator is off. The mixer is now in powered mode. Trigger
the source for Inputs 1D and 2D. Adjust the mixer Output Adjustments 1D and 2D so that the
proper level is heard in the Pilot and Co-Pilot Headsets. It should be the same as in the
unpowered mode. Pull the circuit breaker to the mixer in order to verify this operation.
7.8 Once steps 7.6 and 7.7 are completed, turn on all avionics or other sources connected to Audio
Sources 3 through 8. Adjust the levels as required at Inputs 3 through 8 on the mixer. DO NOT
change the adjustments on Outputs 1D, 2D or 3.
7.9 After Completion of Steps 7.6 through 7.8, adjust Output 3 to the desired level required by the
device connected to Output 3.
Conduct EMI test in accordance with EMI Test Procedure 7001-TP-001.

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8. Kit Parts List
P178 Failsafe Audio Mixer Kit
QTY
PART NUMBER
DESCRIPTION
1
G13120
Audio Mixer
8
CCR264SS-3-02
Pull Rivet
4
MS21042-08
Lock Nut, #8-32
4
MS21059L08
Nut Plate, #8-32, Floating
4
MS35206-245
Screw, #8-32 x 1/2", Phil Pan
8
NAS1149FN832P
Flat Washer, #8
25
205090-1
Contacts
1
205165-1 **
Connector, D25F
1
165X10159XE **
Backshell
** Optional: use Connector Kit M2430812-8F in place of these items