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.
Learn about the effects of particulate matter contamination on aircraft engines and recommendations for operating in volcanic-ash conditions.
In order for an autopilot to get an aircraft from Point A to Point B smoothly and safely, many components must work together; the main component being the autopilot computer.
There are a few errors in the Learjet 60 Maintenance Manual in the procedures of complying with the Functional Test of the Cabin Pressure Warning System on Learjet 60 models.
Recently, Dassault Aviation released several service bulletins and Falcon Service Advisories announcing the installation of ‘wing tank modifications’ for all of the Falcon 50/900/2000 series aircraft.
Hawker 800 series aircraft equipped with SPZ-8000 were required to designate an RVSM critical zone forward of the static ports. This included the nose avionics bay doors.
Communiqué #HK-0017 advises service centers and owner/operators of an information only kit, part number 238-0002, being made available to replace portable fire extinguishers.
Avoid unexpected scheduling and planning headaches by remembering to replace the Lear 40 Series Aft Quadrant at its 10 Year Life Limit.
When you are considering upgrading the MFD to a later model, keep in mind the effect that modification will have on the aircraft’s type certification.
Don't let your engines end up on the DERB list! Some operators are experiencing the unfortunate effects of long-term storage when proper engine preservation procedures have not been followed.
If you have not completed PW SB 26243R2, then P&W recommends Part A of the SB be completed at the next convenient opportunity.