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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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Make Records & Research a part of your Maintenance Event

Within the last three years, I've reviewed several aircraft maintenance records for various aircraft and noted missing entries regarding non-OEM-related equipment. It’s not the major maintenance and inspections that are missing from the logbooks, but rather the small unknown inspections and ongoing required programs that remain outstanding.

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Learjet 35/ 55: Amp Split

The generator control panel controls the voltage for generators that charge batteries, start motors and control the ground power unit. When working properly, these generators share the electrical load.

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Hawker: Technical Manual Deviation Approval

Some Hawker and Beechcraft operators may not be aware there is a wealth of information in the Technical Publications area on the Beechcraft website regarding changes not yet been incorporated into the affected manuals.

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Pratt & Whitney Service Bulletin Update

For the Pratt & Whitney 500 engine models, there are a number of Service Bulletins that have become hot items. These can be accomplished at access for cause but they will be addressed at either a Hot Section Inspection or overhaul, whichever occurs first.

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