TRIG TC20 Transponder Controller (For TT21 & TT22)
Delivery Options
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Dates provided are estimates to major cities & not guarantees*
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Delivery Estimates
Orders placed by 3pm AEST Monday–Friday ship the same day. Weekend orders ship Monday. Freight costs are calculated at checkout.
Express Post typically arrives next business day in major Australian cities for orders placed before our cut-off.
Not available for orders including aerosols or DG’s.

- Delivery dates are estimates, not guarantees.
- Bulky items may be shipped via TNT Road express.
- See our full shipping policy here.
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Description
The TC20 panel mounted control head controls a remotely mounted TT21 or TT22 Mode S transponder. It mounts into the panel using a 57 mm (2-1/4 inch) round hole or smaller compact mount. The unit displays the operation mode of the transponder, reported pressure altitude, current squawk code, and flight ID.
Includes:
- Control head
- Install kit
- Installation and user manuals
- EASA form 1
Features:
- Compact form factor – fits in a compact or standard 2-I/4 inch instrument hole
- Minimal depth – create space in your panel for other avionics
- One handed operation
- Single press VFR button
- Rapid Squawk selection
- Display features tail number and flight level for reference
- Integrated altitude encoder
- Certified for IFR / VFR flight
- Manual dimming feature (adjustable backlight)
- Splash proof, ideal for open cockpit and seaplane
- Low power consumption
- Two year warranty from date of install, U.S. based technical support
Specifications
| Category | Aircraft Supplies |
|---|---|
| SKU | 01318-00 |
| Shipping Weight | 0.5 kg |
The TC20 panel mounted control head controls a remotely mounted TT21 or TT22 Mode S transponder. It mounts into the panel using a 57 mm (2-1/4 inch) round hole or smaller compact mount. The unit displays the operation mode of the transponder, reported pressure altitude, current squawk code, and flight ID.
Includes:
- Control head
- Install kit
- Installation and user manuals
- EASA form 1
Features:
- Compact form factor – fits in a compact or standard 2-I/4 inch instrument hole
- Minimal depth – create space in your panel for other avionics
- One handed operation
- Single press VFR button
- Rapid Squawk selection
- Display features tail number and flight level for reference
- Integrated altitude encoder
- Certified for IFR / VFR flight
- Manual dimming feature (adjustable backlight)
- Splash proof, ideal for open cockpit and seaplane
- Low power consumption
- Two year warranty from date of install, U.S. based technical support
| Category | Aircraft Supplies |
|---|---|
| SKU | 01318-00 |
| Shipping Weight | 0.5 kg |

