Sigtronics SPA-400 TSO Aircraft Intercom Fully working when removed – pulled for avionics upgrade

Excellent condition genuine Sigtronics SPA-400 TSO 4-place intercom. Removed from a working aircraft during a recent avionics upgrade. Tested and operational at time of removal.

Features & Specs:

• Model: SPA-400 TSO
• FAA TSO: C-50b
• Environmental Category: DO-160 (CFBBBX)
• Voltage: 12/24 Volts (11–32 VDC)
• Serial Number: 60270041
• Manufacturer: Sigtronics Corporation, Covina, CA USA
• Compact panel-mount design (1" x 2.5" faceplate)
• Controls: SQ (Squelch), ON/OFF, Volume (VOL)
• Includes attached wiring harness and white multi-pin connector

Verifiable Compatible Aircraft: This TSO-certified intercom is designed for all standard general aviation aircraft and works with any GA radios and headsets. Commonly installed in:

• Cessna (150, 152, 172 series and similar piston singles)
• Piper (Cherokee, Warrior, Arrow, etc.)
• Beechcraft (Baron, Bonanza, and light twins)
• Experimental / Kit planes (Vans RV series, Lancair, etc.)
• Ultralights, warbirds, and high-noise aircraft
• Many helicopters

(Confirmed compatible via Sigtronics official documentation and real-world installations in certified and experimental aircraft.)

Condition:

• Very good cosmetic and functional condition
• Received Black Paint Over-spray
• Clean unit with clear, fully legible labels
• No major scratches or damage
• Working when removed (see service tag photo)

Included:

• Sigtronics SPA-400 TSO intercom
• Attached wiring harness + connector
• Original service tag (“Working when Removed”)

Message me with any questions — more photos available

THANKS FOR LOOKING