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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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July 2025 Edition

Video: Radar Stabilization Function Failure

A little understanding on how radar stabilization works can help both the flight crew determine erroneous return information, and assist the maintenance technicians tasked with troubleshooting the system.

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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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New Challenger Flap System Capability

Members of Duncan Aviation's Challenger program have developed a portable flap systems test bench that provides immediate feedback with increased accuracy, and does not require a test flight for analysis

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