PS Engineering PMA6000M-S - Manual (Page 9)

PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
200-066-0006 Page 2-2 Rev. 6, March 2005
2.3.2 Mounting Requirements
The PMA6000 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.
NOTE: The mounting hole configuration for the PMA6000 is identical to the KMA-24 Audio Se-
lector Panel. See Appendix B
2.3.3 Mounting Rack Installation
2.3.3.1 Monaural (6000, 6000M, 6000C, 6000MC)
Remove the unit from the mounting tray by first removing the copilot volume and squelch knobs (the
knobs are press-fit on the shaft) and then unscrew the 3/32-inch hex-head screw that is to the right of the
copilot control knob shaft. Carefully slide the unit free of the tray. Set the unit aside in a safe location until
needed. Install the tray using six FHP 6-32 x ½-inch screws. The audio selector panel must be supported at
front and rear of the mounting tray.
2.3.3.2 Stereo (6000S, 6000MS, 6000SC, 6000MSC)
Remove the unit from the mounting tray by unscrewing the 3/32" hex-head screw that is to the right of the
squelch knob shaft. It is not necessary to remove the squelch knob. Carefully slide the unit free of the tray.
Set the unit aside in a safe location until needed. Install the tray using six FHP 6-32 x ½" screws. The au-
dio selector panel must be supported at front and rear of the mounting tray.
2.3.4 Connector Assembly
The unit connectors mate directly with the circuit boards in the PMA6000. The connectors are a Molex
crimp-type, and require 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, from the inside of the tray. Ensure that proper
strain relief and chafing precautions are made during wiring and installation.
2.4 Cable Harness Wiring
Referring to appropriate Appendix C, D, E and F, assemble a wiring harness as required for the installa-
tion. All wires must be MIL-SPEC in accordance with current regulations. Two- and three-conductor with
shield wire must be used where indicated, and be MIL-C-27500 or equivalent specification. Proper strip-
ping, shielding and soldering technique must be used at all times. It is imperative that correct wire be used.
Refer to FAA Advisory Circular 43.13-2A for more information. Failure to use correct techniques may
result in improper operation, electrical noise or unit failure. Damage caused by improper installation will
void the PS Engineering warranty.
2.4.1 Noise
Due to the variety and the high power of radio equipment often found in today's general aviation aircraft,
there is a potential for both radiated and conducted noise interference.
The PMA6000 power supply is specifically designed to reduce conducted electrical noise on the aircraft
power bus by at least 50dB. Although this is a large amount of attenuation, it may not eliminate all noise,
particularly if the amplitude of noise is very high. There must be at least 13.0 VDC present at the bottom
connector, pin 20, of the PMA6000 for the power supply to work in its designed regulation. Otherwise, it
cannot adequately attenuate power line noise. Shielding can reduce or prevent radiated noise (i.e., beacon,
electric gyros, switching power supplies, etc.) However, installation combinations can occur where inter-