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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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September 2025 Edition

Gyro Overhaul: We Do More Than What's Required. We Do What's Right

When overhauling a Vertical Gyro, most facilities stop at replacing the components mandated by the Component Maintenance Manual. While this meets the requirements for returning the gyro to service, Duncan Aviation goes further, prioritizing what is right over what is merely required.

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New Hawker Mandatory Service Bulletin

If you operate a Hawker 750, 800XP, 850XP or 900XP, please take note. Hawker Beechcraft Corporation recently released Mandatory Service Bulletin (MSB) 24-3968 titled Electrical Power-Introduction of In-Line Fuses...

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Environmental System Squawks

For all aircraft that have an air cycle machine, leaks, cooling turbine, intercoolers, regulators and air supply sources are more prone to show their deficiencies when cooling air if they are not up to specification

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King Air ADF Tip

If the ADF quits pointing on your King Air, be sure to check the AC Fuse in the nose’s right-hand J-box

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Navigation Unit Fails Soon After Repair

Duncan Aviation recently saw a Nav unit in our avionics shop that failed soon after being repaired by another service provider. The Duncan Aviation technician found some screws had been driven into a circuit board...

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