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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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Hawker Structural Inspection Intervals

When API winglets are installed on a Hawker aircraft, several structural inspection intervals are reduced. This interval reduction is easily overlooked by an operator…

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Learjet Gust Locks Prevent Unnecessary Damage

Gust locks lock the control column in place, preventing random movement and possible damage of the surface from wind while an aircraft is parked. It only takes a small investment to prevent damage that could cost tens of thousands of dollars and hours to repair.

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Hawker NLG Strut Leak Concerns

HawkerBeechcraft Communiqué HK-0012 displays concerns for the Piston Seal, PN 25UN523, in the NLG Strut. This seal may last for many flights, even in Arctic temperatures, but can start leaking without warning. Small leaks can often be severe enough to deplete the NLG Strut of all fluid.

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Learjet RVSM Pitot Probe Alignment FAQS

Dave Schiver, Duncan Aviation Learjet Tech Rep, answers your questions in regards to RVSM pitot probe alignment inspections on aircraft that have the Bombardier STC solutions installed.

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P&W Service Bulletin 30382

The P&W Service Bulletin 30382 introduces a seal between the turbine exhaust case and the turbine exhaust mixer assembly to keep hot exhaust gases from sensitive areas.

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When Exactly is the RVSM Manual Required?

Carrying the RVSM manual on board is only a regulatory requirement when the Operations Specifications, Letter Of Authorization or the FAA-approved RVSM maintenance manual states that you must have it on board. Having the RVSM manual on board, however, can be quite valuable in certain situations and is always a good idea.

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