The Garmin G5 is a popular digital backup for piston single-engine aircraft, offering a modern alternative to traditional vacuum-driven instruments. It fits into a standard 3-1/8-inch instrument cutout and is approved for installation under a Supplemental Type Certificate (STC). The decision to install a G5 as a backup PFD has both significant pros and a few cons.
Pros * Enhanced Safety and Reliability ✈️: The G5 uses a solid-state Attitude and Heading Reference System (AHRS), which is more reliable than older vacuum-driven gyros. It eliminates the risk of a vacuum pump failure, which would cause a complete loss of attitude and heading information. The optional internal lithium-ion backup battery can provide up to 4 hours of emergency power in case of an aircraft electrical failure.
- Consolidated Information 🛟: The G5 combines multiple instruments into a single, easy-to-read screen. In its PFD configuration, it displays attitude, airspeed, altitude, vertical speed, and slip/skid. This reduces pilot workload and scan time, especially during instrument flight.
- Affordable Upgrade: The G5 provides a cost-effective way to get the benefits of a modern glass cockpit without the expense and complexity of a full panel replacement. Its compact size and design make it a drop-in replacement for a variety of existing instruments.
- Autopilot Integration: The G5 can be integrated with Garmin’s GFC 500 digital autopilot, offering advanced features like coupled GPS approaches and overspeed/underspeed protection.
Cons
- Lack of Features: While it is a significant upgrade from analog gauges, the G5 does not have advanced features found in larger, more expensive glass systems. It lacks synthetic vision and a moving map display, which are common in primary flight displays.
- Dependency on External Sensors: While the G5 has a built-in GPS and air data computer, for full functionality as a Horizontal Situation Indicator (HSI), it must be paired with an external magnetometer (GMU 11) and an optional navigation data adapter (GAD 29) to interface with a compatible GPS navigator or NAV/COM.
- Battery Maintenance: The optional backup battery, while a safety feature, requires proper care and monitoring. Like all batteries, it has a limited life span and must be replaced to ensure it will function properly in an emergency. The G5 also has a delicate anti-reflective coating that must be cleaned with specific, non-ammonia-based cleaners.
- Repair and Service Limitations: The G5 does not contain any user-serviceable parts. If a failure occurs, the unit must be serviced by a Garmin-authorized repair facility. Unauthorized repairs or modifications could void the warranty and the authority to operate the device under FAA regulations.
The Aero Center, located at William J. Fox Airfield KWJF | Lancaster, CA, is an authorized Garmin dealer and service center. We have built our reputation on social proof from a long history of satisfied customers across California, Arizona, and Nevada who trust us with their avionics. Our unique selling proposition is being the only 24/7 maintenance center in the area. This commitment to consistency means we can begin the diagnostic and repair process immediately, minimizing your aircraft’s downtime.