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Sigtronics Spa-4S Stereo Intercom FAA TSO

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Part# 11-00567
MFR Model# SPA-4S


The SPA-4S is a compact 2 or 4 place voice activated intercom with inputs for stereo music. It is a compact system that allows it to fit in space critical panels. The SPA-4S uses the industry standard Sigtronics squelch, fast on slow off for hands free communication. The music will full mute during ATC communication and partial mute during intercom communication. When radio / intercom use is ended the music will gradually return to its previous volume.

Easy Upgrade
Each intercom comes complete with all necessary mounting hardware, jacks, and two 4-foot pre-wired harnesses. The SPA-4S only requires 1 X 2.5 of panel space, mounts horizontal or vertically, is 4 deep, and weights 5.5 oz. The SPA-4S intercom can easily upgrade the SPA-400. The SPA-4S uses the same panel hole pattern and interface cable as the SPA-400. A second cable is provided for the music inputs and headphone outputs.
California Prop 65 Warning Symbol

WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.


  • FAA TSO approved.
  • Pilot fail safe feature allows pilot to always hear radios.
  • Use Satellite Radio, MP3 or CD players as audio source.
  • Reversible face plate included for vertical or horizontal mounting.
  • Radio priority assures that ATC hears only the crew member transmitting.
  • Installation hardware included, including jack kit and pre-wired harness.
  • WARRANTY: Five years parts and labor.


  • Headset Positions: 4
  • Stereo: Yes
  • Size: 4" x 2.5" x 1"
  • Unit Weight: 5.5 oz.
  • Jacks/Harness Weight: 7 oz.
  • Warranty: 5 years
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Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Does the Sigtronics SPA-4SN (11-00568) include a wire harness and panel jacks in the box?

Yes, both wire harness and jacks are in the box.

Q: Is the Sigtronics SPA-4S stereo intercom FAA TSO'd?

Yes, this unit is TSO'd.

Q: Does the Sigtronics SPA-4S stereo intercom come with 4 jacks?

Yes, 4 jacks are included.

Q: Is the SPA-4SN also TSO?

Yes, both units are TSO approved.

Q: Can the Sigtronics SPA-4S intercom be used with monaural headsets or does it require stereo headsets?

The SPA-4S is for stereo headsets, Please view the SPA-400 p/n: 11-02791 for the standard version.

Q: Can the SPA-4S be used in Certified Aircraft?

Yes, part # 11-00567 is FAA TSO approved.

Q: With this Signtronics SPA-4S intercom can work with old radio King KX-170B?

As long as the wiring is done correctly, it will work.

Q: What gauge of wire are the wire bundles that are included in this Sigtronics SPA-4S intercom?

Per the manufacturer, 22 gauge wire is used for the harness.

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