The uAvionix AV-thirty-C and the two thousand dollar digital instrument replacing every vacuum gauge in your panel

The uAvionix AV-30-C is a TSO-certified, solid-state digital instrument that replaces vacuum-driven attitude and heading indicators in certified aircraft for a street price of approximately $2,000. It drops into a standard 3⅛-inch panel hole, eliminates dependence on the vacuum system entirely, and is legal for IFR flight — making it the most affordable certified digital instrument available for general aviation.

What Is the AV-30-C and How Does It Work?

The AV-30-C is a single three-inch round instrument that fits the same panel cutout as a standard attitude indicator or heading indicator. No panel cutting or new holes are required. You remove the old gauge, install the AV-30-C, connect power and pitot-static lines, and the instrument is operational.

Instead of spinning gyroscopes driven by vacuum pressure, the AV-30-C uses MEMS (microelectromechanical systems) accelerometers and gyroscopes — the same core sensor technology found in smartphones, but packaged to meet TSO-C4, the FAA’s standard for attitude instruments in certified aircraft under IFR.

In attitude mode, the display presents a synthetic horizon with pitch, roll, slip/skid indication, indicated airspeed, altitude, vertical speed, and heading. In heading mode, it functions as a horizontal situation indicator with a digital compass rose, GPS track, and heading bug. Two units — one in each mode — replace both the attitude indicator and heading indicator for roughly $4,000 total, eliminating the vacuum system entirely.

Why Does TSO Certification Matter?

Affordable digital instruments have existed in the experimental market for years. The MEMS technology is not new. What separates the AV-30-C is that uAvionix completed the full FAA certification process, earning a TSO that allows installation in certified aircraft — Cessna 172s, Piper Cherokees, Beechcraft Bonanzas — via a Supplemental Type Certificate (STC).

Most budget digital gauges are limited to experimental or VFR-only use. The AV-30-C is approved for certified IFR flight at a fraction of the cost of alternatives. That distinction is the entire value proposition.

What Does the AV-30-C Really Cost Installed?

The $2,000 street price is for the unit alone. The full installed cost is higher:

• Instrument unit: ~$2,000
• Installation labor: $500–$2,000 depending on the shop, aircraft, and scope of vacuum system removal
• All-in cost for one unit: $3,000–$4,000 installed
• Two units (attitude + heading): $6,000–$8,000 installed with vacuum removal

Compare that to replacing a traditional vacuum attitude indicator at $800–$1,500 for the instrument, plus the ongoing costs of maintaining the vacuum pump, plumbing, regulator, and filter. When the vacuum pump fails — and it will — expect another $500–$1,000 plus labor.

The Real Value: Eliminating the Vacuum System

The most significant benefit of the AV-30-C isn’t the instrument itself — it’s what you remove from the airplane.

A typical single-engine piston vacuum system is a chain of failure points: a mechanically driven pump spinning at high RPM, a drive coupling to the engine accessory case, air lines, filters, regulators, and gyroscopes spinning at thousands of RPM inside sealed cases. Every link is a potential failure point. When the vacuum system fails in instrument meteorological conditions, the pilot is flying partial panel — a scenario that kills experienced pilots.

The AV-30-C eliminates that entire failure chain. It also includes an internal battery lasting over four hours, meaning it continues operating even during a complete electrical failure.

What Are the Limitations?

Display size. The three-inch round screen is small. Compared to the Garmin G5’s slightly larger rectangular display, the AV-30-C can feel cramped. Supplementary data — airspeed tape, altitude tape — appears in small text around the edges. Pilots who wear reading glasses or scan rapidly in turbulence may find the information density challenging.

GPS dependency. The AV-30-C can accept GPS position data to sharpen heading accuracy and display ground track, but it does not include its own GPS receiver. An external source — a GPS navigator or ADS-B transponder with data output — must feed it via serial connection. Without GPS input, heading performance degrades over time and ground track information is unavailable.

MEMS sensor drift. MEMS sensors are temperature-sensitive and subject to drift. Internal algorithms compensate effectively for the price point, but the AV-30-C is not as rock-solid as fiber optic or ring laser gyros. In extended IFR flight, attitude may drift a degree or two. For most general aviation IFR flying, this is within acceptable limits — but it’s a different league from a $20,000 Garmin GFC 500 or a $40,000+ integrated flight deck.

Installation is not a weekend project. The STC installation requires an avionics shop or an A&P mechanic with Inspection Authorization. Your specific aircraft must be on the STC’s approved model list.

How Does It Compare to the Garmin G5?

The Garmin G5 is the most direct competitor:

The G5 offers a better display, more polished software, and seamless integration with Garmin navigators and autopilots. The Garmin GI 275 at roughly $4,000 per unit is even more capable. But the AV-30-C wins on price — and for the owner of a 1978 Cessna 182 with a vacuum system on borrowed time and a realistic budget, price is what determines whether an upgrade actually happens.

An installed digital instrument beats a dream panel every day.

Who Makes the AV-30-C?

uAvionix, based in Bigfork, Montana, built its reputation in the ADS-B space with affordable compliance products like the tailBeacon and skyBeacon. The company’s philosophy is consistent: identify a pain point in general aviation, apply modern sensor technology, complete FAA certification, and price the product where real aircraft owners can write the check.

uAvionix also offers the AV-30-E for experimental aircraft — the same hardware at an even lower price without TSO certification overhead.

Should You Remove Your Vacuum System Entirely?

This is a personal risk calculation. The argument for keeping the vacuum system as a backup is straightforward: redundancy saves lives. If the digital instrument fails, the old steam gauges remain.

The counterargument is compelling. The AV-30-C’s internal battery runs for over four hours independent of aircraft electrical power. In a vacuum pump failure — the most common failure mode — the AV-30-C is unaffected because it never needed the vacuum pump. Meanwhile, maintaining two parallel systems means paying for two inspections, carrying unnecessary weight, and keeping a mechanical failure point that no longer serves a primary function.

The trend among owners is clearly moving toward full vacuum system removal, trusting the solid-state instrument and its battery backup. But both approaches are defensible.

Where Is This Technology Heading?

The AV-30-C represents the latest step in a clear trajectory of glass cockpit democratization:

• 15 years ago: Garmin G1000 — $60,000–$80,000, factory-installed only
• 10 years ago: Dynon Certified HDX — $30,000–$40,000 for legacy aircraft
• 5 years ago: Garmin G5/GI 275 — ~$10,000 range for individual instruments
• Today: uAvionix AV-30-C — under $5,000 for a complete attitude and heading solution

The current limitation is integration. The AV-30-C is a standalone instrument — it doesn’t drive an autopilot or communicate meaningfully with navigators beyond accepting GPS data. Garmin’s ecosystem advantage is significant: the G5 talks to the GTN 750Xi, which talks to the GFC 500 autopilot, which connects through Flight Stream to ForeFlight. uAvionix is working toward greater integration but isn’t there yet.

Key Takeaways

• The uAvionix AV-30-C is the most affordable TSO-certified digital attitude/heading indicator for certified IFR aircraft, with a unit price of approximately $2,000 and all-in installed costs of $3,000–$4,000.
• It uses solid-state MEMS sensors instead of vacuum-driven gyroscopes, eliminating an entire mechanical failure chain from the aircraft.
• The internal 4+ hour battery backup provides continued operation during complete electrical failure.
• Limitations include a small display, no internal GPS receiver, and MEMS drift that falls short of high-end gyro systems — acceptable trade-offs for most GA IFR flying.
• For owners of legacy aircraft with aging vacuum systems and realistic budgets, the AV-30-C is the product that makes the transition from steam gauges to digital actually achievable.