Duncan Aviation is a national name in business aviation MRO, and its Denver satellite operation at Centennial Airport runs out of a 10,000 square foot hangar on Control Tower Road. Being a satellite of a much larger company changes what it is good at: this location leans into avionics retrofits and line maintenance rather than trying to be a full heavy-maintenance base, with the parent company's broader resources behind it when a job needs to scale up.
What They Actually Do
The published specialty here is avionics retrofits alongside the regulatory inspections that turbine operators actually lose sleep over: RVSM checks, 91.411/91.413 (altimeter and transponder) inspections, and ELT inspections. They also handle flight data recorder downloads and line maintenance for turboprops, plus mobile technical support that reaches within roughly 200 miles of the field - useful if the airplane is down somewhere between Denver and the mountains and a truck is more realistic than a ferry flight.
Who This Fits
This is a turbine and turboprop shop first. If you are running a King Air or similar and need RVSM or transponder/altimeter compliance work done on schedule, or a mobile tech to come to you within the region, this location is built around exactly that. It is not the stop for a piston single's annual.
The 200-mile mobile support radius is worth knowing about before you assume an AOG situation means shipping the airplane back to KAPA. Ask what is covered by the mobile team versus what genuinely needs the home hangar.
Why RVSM and Transponder Checks Matter
RVSM (Reduced Vertical Separation Minimum) certification lets an aircraft fly in airspace where jets are stacked just 1,000 feet apart instead of 2,000 above FL290, which only works if the aircraft's altitude-reporting equipment is checked and certified to a tight tolerance on a recurring schedule. The 91.411 and 91.413 inspections cover the altimeter/static system and transponder respectively, and both have to be current for IFR flight in controlled airspace, not just for RVSM routes. Letting either lapse does not ground the airplane outright, but it does close off the airspace and routes that make a turboprop or jet actually useful for the missions it is bought to fly.
| Inspection | What It Covers | Typical Interval |
|---|---|---|
| 91.411 (altimeter/static system) | Altitude reporting accuracy for IFR flight | Every 24 calendar months |
| 91.413 (transponder) | Transponder and altitude reporting equipment | Every 24 calendar months |
| RVSM monitoring | Height-keeping performance for reduced-separation airspace | Periodic, per the operator's approved program |
| ELT | Emergency locator transmitter function and battery | Every 12 calendar months |
When to Use the Denver Satellite vs. a Full Duncan Facility
If you need scheduled RVSM, transponder, or altimeter compliance work, an avionics retrofit, or routine turboprop line maintenance, the Denver satellite is scoped for exactly that, and it puts a national MRO's parts network and technical resources behind a local visit. If you are dealing with a heavy structural repair, a full interior, or paint, that is generally outside what a satellite location like this is set up to do, and it is worth asking directly whether the job needs to route to one of Duncan's larger regional facilities instead. If the aircraft is down somewhere within roughly 200 miles of KAPA, ask what the mobile team can address on site before assuming a ferry flight back to the hangar is the only option.
What an AOG Call Actually Involves
An AOG (aircraft on ground) situation forces a fast decision: does the fix travel to the airplane, or does the airplane travel to the fix? That call usually comes down to what actually failed. A software update, an intermittent avionics fault, or a component swap a mobile technician can carry in a truck is a candidate for on-site support. A structural issue, anything requiring a hangar and specialized tooling, or a repair that needs the aircraft jacked and disassembled generally means the airplane has to come to the shop regardless of distance. Knowing which category a given squawk falls into before making that call can save a full day of downtime, since dispatching a mobile tech for a repair that turns out to need the home hangar just adds a second trip on top of the first.
Progressive vs. Annual Inspection Programs
Turboprops that fly a lot of hours a year, charter aircraft especially, often move to a progressive inspection program instead of a single annual once-a-year event. Progressive programs break the same inspection scope into smaller chunks spread across the year, which keeps the aircraft flying more of the time instead of sitting down for one long annual event, at the cost of more frequent, shorter visits to the shop. Whether that tradeoff makes sense depends on utilization: a lightly flown personal turboprop rarely benefits from splitting up the work, while a hard-flown charter airplane often does.
Bottom Line
Duncan Aviation's Denver satellite is built around the compliance work that actually keeps a turboprop legal and useful: RVSM, transponder, and altimeter checks, plus avionics retrofits and mobile support. For anything bigger than that, expect a conversation about whether the job stays local or routes elsewhere in the Duncan network.
Getting There
The Denver location is at 12850 E Control Tower Road, on the same corridor as several other maintenance operations on the field.