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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As 2025 comes to an end, ACS Rep Rene Cardona reflects on what shaped this year’s preowned business jet market. The fourth quarter is always busy, but this year brought a unique level of intensity, driven by economic uncertainty early on and a surge of confident buyers later. Here’s his perspective on what we experienced in 2025—and what to expect as we head into 2026.
Don't get grounded by confusing nose wheel vibrations! A true nose gear shimmy—that rapid, side-to-side oscillation—is a serious issue often linked to play in the torque links, requiring immediate mechanical attention. In contrast, a simple vertical shudder felt during taxi or initial climb is often just an easily corrected wheel imbalance. This quick guide details the key differences and the essential steps to accurately troubleshoot the condition, starting with a simple inspection of the nose gear scissors.
Is your aircraft compliant? Missing small inspections tied to STCs or life-limited parts can lead to costly downtime and mandatory replacements. Learn why detailed records research is essential.
Don't Let Your Spare Aircraft Batteries Go Flat! Keeping a stock of essential aircraft batteries is crucial for operational readiness, but did you know that improper storage can drastically cut their lifespan and capacity? While temperature affects performance in the air, the storage environment is key to minimizing self-discharge and maintenance needs. Discover how optimizing storage temperature—from the effects of higher heat to the benefits of cold storage—can save you money, extend battery life, and ensure your spares are ready to deliver maximum performance when you need them most.
Honeywell has issued two Category II Reliability Service Bulletins, TFE731-79-3070 R1 and TFE731-79-5120, for the installation of new instruction plate decals on oil tanks to help prevent oil over-servicing.
I recently ran across an issue with a Pratt & Whitney engine oil leak and felt it would be to everyone’s benefit to clarify my findings.
Hartzell propeller AD94-17-13 and SB165E are very confusing, and you need to read both in their entirety to understand their full meaning.
Our Challenger Tech Reps recommend two new areas for CL600 corrosion inspection.
For advanced GPS-enabled approaches on Challenger 601-3A/R, Falcon 900B or Hawker 800XP and if you want a NZ-2000 FMS upgrade, then consider this.
Universal Avionics UNS-1M database subscriptions are coming to an end. UNS-1M trade-in and upgrades are available through the Duncan Aviation Avionics Satellite Network.
Honeywell has released a Service Information Letter to inform operators of possible FAME contamination in aviation fuel.
Falcon jack pads fit very tight and don't easily seat down properly when installed. The threads on the pad can be chased to ease the turning torque required to install the pad.
James Hood discusses the difference between tool precision and accuracy.
If you are experiencing any type of gyro system abnormality, NOW is the time, as temperatures begin to rise, to get your Gyro (Vertical or Directional) serviced.
Four Learjet Temp Revisions (TR) were just released on the 40 and 45, regarding the inspection of the main landing gear (MLG) struts and actuators.