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Duncan Intelligence Newsletter

The Duncan Intelligence is a free, technical newsletter for business aircraft owners and operators. Written in-house by Duncan Aviation's technical representatives, each edition includes technical tips and advice on topics and trends in business aviation. It is a free, monthly e-mail subscription for aviation enthusiasts around the world.

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June 2025 Edition

Gulfstream 550 Intermittent Fuel Quantity

Duncan Aviation airframe technicians recently addressed recurring intermittent fuel quantity issues in two Gulfstream 550 aircraft. Continue reading to learn about their troubleshooting steps and the results they achieved.

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June 2025 Edition

Aviation Clean Air Ionization System For Odor- & Pathogen-Free Flying

One of the most annoying things that detracts from the comfort and convenience of flying is a lingering, unpleasant odor. For the last several years, Duncan Aviation has been installing the air-cleaning ionization system from ACA, and our clients have been pleasantly surprised by how clean and fresh the system keeps the air in the cabin during all phases of flight.

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TDR 94/94D Common Error Codes

Your TDR-94/94D transponder communicates what is happening on the inside of the unit through error codes presented on the display. There are Level 1 Failure codes that, if ignored, are detrimental to the unit and will cost you more in the end.

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Duncan Aviation Transforms Reliable G550

Duncan Aviation recently refurbished a 12-year-old Gulfstream G550 for a customer who appreciates the dependability of the aircraft and wanted it to remain an integral part of his fleet.

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