We Do It Right.

No Shortcuts.

Keltic Aviation is a family-operated aircraft repair and upgrade shop in Upland, California. Backed by 30 years of aviation experience, we provide aircraft maintenance and repair, avionics troubleshooting, inspections, installations, and upgrades.


Whether you need to diagnose an avionics issue, address an aircraft repair, keep up with maintenance, or plan an equipment upgrade, our team brings hands-on knowledge and careful workmanship to every job.

Aircraft Repair, Maintenance & Avionics Under One Roof

Keltic Aviation brings aircraft maintenance and avionics services together in one shop. We provide troubleshooting, repairs, inspections, preventive maintenance, installations, and upgrades based on the needs of your aircraft.


Have a specific service in mind? Explore All Aircraft & Avionics Services or contact our team to discuss your aircraft.

Keltic Aviation Aircraft Maintenance & Repair

Aircraft Maintenance & Repair

Keep your aircraft properly maintained with experienced, hands-on service. We address maintenance needs, mechanical concerns, and repairs identified through...

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Keltic Aviation Avionics Repair & Troubleshooting

Avionics Repair & Troubleshooting

Avionics problems are not always obvious. We take a methodical approach to troubleshooting to help identify the source of equipment and system issues before...

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Keltic Aviation Avionics Installation & Upgrades

Avionics Installation & Upgrades

Planning an avionics upgrade? Keltic Aviation provides avionics installation and upgrade services with attention to workmanship, system integration, and the needs of...

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Keltic Aviation Aircraft Inspections & Preventive Maintenance

Aircraft Inspections & Preventive Maintenance

Routine inspections and preventive maintenance help you stay informed about your aircraft’s condition and identify items that require attention. Our team provides...

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Keltic Aviation Navigation, Communication & Flight Systems

Navigation, Communication & Flight Systems

We service aircraft navigation, communication, and related flight systems. From troubleshooting existing equipment to completing installations and upgrades,...

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30 Years of Hands-On Aviation Experience

Experience matters when you are trusting someone with your aircraft.


For 30 years, Keltic Aviation has built practical knowledge through hands-on aircraft maintenance, repair, avionics, troubleshooting, inspections, and upgrades. That experience shapes how we approach every aircraft that enters our shop.


As a family-operated business, we value straightforward communication, personal service, and workmanship we can stand behind. We take the time to understand what your aircraft needs and determine the appropriate path forward.

30 Years of Hands-On Aviation Experience

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Family Operated

Personal service from an aircraft repair and upgrade shop that takes pride in its workmanship.

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30 Years of Experience

Decades of hands-on experience across aircraft maintenance, repair, inspections, avionics, and upgrades.

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Maintenance & Avionics

Aircraft maintenance and avionics capabilities in one shop for a more convenient approach to service, repair, and upgrades.

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Methodical Troubleshooting

A detail-focused approach to identifying aircraft and avionics issues before determining the appropriate course of action.

See Our Aircraft & Avionics Work

Take a closer look at the workmanship behind Keltic Aviation. Our gallery features aircraft maintenance, repairs, avionics installations, upgrades, and other work performed in our shop.

Small silver propeller airplane parked on a runway under a clear sky.
Red vintage single-engine airplane parked inside a hangar.
Cockpit view with multiple control panels, screens, switches, and gauges inside an aircraft or simulator.

Aircraft & Avionics Services in Upland, CA

Keltic Aviation is located at 1749 W 13th St, Hangar 9A, Upland, CA 91786. From aircraft maintenance and aviation repair to avionics troubleshooting, inspections, installations, and upgrades, our team is ready to discuss the work your aircraft needs.

Have a problem that needs troubleshooting or an upgrade you are considering?

Contact Keltic Aviation to talk with our team.

Frequently Asked Questions

  • What services does Keltic Aviation provide?

    Keltic Aviation provides aircraft maintenance and repair, avionics troubleshooting and repair, avionics installation and upgrades, aircraft inspections and preventive maintenance, and service for navigation, communication, and flight systems.

  • Does Keltic Aviation troubleshoot avionics problems?

    Yes. Avionics troubleshooting and repair are core services at Keltic Aviation. We work to identify the source of the issue before determining the appropriate repair.

  • Can Keltic Aviation install and upgrade aircraft avionics?

    Yes. We provide avionics installation and upgrade services. Contact our team to discuss your aircraft, current equipment, and the upgrade you are considering.

  • Does Keltic Aviation perform aircraft inspections?

    Yes. We provide aircraft inspections and preventive maintenance to evaluate aircraft condition and identify items that may require maintenance or repair.

  • Where is Keltic Aviation located?

    Our shop is located at 1749 W 13th St, Hangar 9A, Upland, CA 91786. We are open Monday through Friday from 7:30 a.m. to 4:00 p.m. and closed Saturday and Sunday.

Let’s Talk About Your Aircraft

Need aircraft maintenance, repair, avionics troubleshooting, an inspection, installation, or an upgrade? Put 30 years of hands-on aviation experience to work for your aircraft.

We Do It Right. No Shortcuts.