
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0008 Page 2-5 Rev. 8, June 2003
2.3.2.10 Observer Installation Configuration (S5)
When the Observer versions are used (Part Number 050-240-0400, -0401, -0403, -0404) the cockpit unit is
configured as “Pilot” and the Observer station is configured as “Copilot.”
Switch S5
2 ON ON
3 OFF
Cockpit unit –
Observer Installa-
tion
ON
Observer unit –
Installation
Switch S3
1
OFF
2
ON
Expansion In en-
abled
3
OFF
4
ON
Expansion Out
enabled
Switch S2
3
ON
4
OFF
Pass Input
In an observer unit, jumpers J4 and J5 should be configured like a copilot's unit in dual installation.
2.3.3 Mounting Requirements
The PAC24 must be rigidly mounted to the instrument panel of the aircraft structure and within view and
reach of the pilot position(s). 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.
Avoid installing the audio panel close to high current devices or systems with high-voltage pulse type out-
puts, such as DME or transponders.
NOTE: The mounting hole configuration for the PAC24 is identical to the
KMA-24H -71 Audio Selector Panels.
2.3.4 Mounting Rack Installation
Remove the unit from the mounting tray by unscrewing the 3/32" hex-head screw that is between the Com
5 and NAV 1 buttons. Use caution to avoid hitting the photo-detector lens. Carefully slide the unit free of
the tray. Set the unit aside in a safe location until needed. Install the tray using six clip nuts (475-630-
0002), and six FHP 6-32 x ½" screws (475-632-0012). The audio selector panel must be supported at front
and rear of the mounting tray.
2.3.5 Tray and Connector Assembly
The unit connector mates directly with the circuit board in the PAC24. The connector is a Molex crimp-
type, and requires the use of a Molex hand crimp tool, EDP P/N 11-01-0203, CR6115B (or equiv.). The
connector is mounted to the unit tray with #4-40 screws (475-440-0008), from the inside of the tray. En-
sure that proper strain relief and chafing precautions are made during wiring and installation, using the
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