Over almost 50 years, the MD 500D has earned its place as a global favorite. Even as newer, more powerful variants have emerged, the D model continues to command loyalty from operators worldwide. But that loyalty hasn’t been without question — the message from the field was clear: there’s room to do more. MD Helicopters listened. The result is a customer-driven evolution — the Super D20B — marking the first in a series of upgrades designed to bring new life to the legacy aircraft.
In February 2023, Ryan Weeks marked six months as vice president of aftermarket support at MD Helicopters by traveling to Hanmer Springs, New Zealand, to attend The Great Kiwi 500 Fly-In — an event that brought together one of the company’s largest communities of operators. Of the 106 MD 500 helicopters in the country, 63 participated in the gathering, including 20 D models — a testament to the aircraft’s ongoing strength and relevance in the field.
Weeks attended the event with a clear objective: to connect directly with MD’s customer base and better understand the issues that had strained relationships in recent years, particularly when it came to supporting aircraft already in service.
Tackling one of MD Helicopters’ most pressing challenges — aftermarket support — was the top priority for Weeks, who would later step into the roles of president and CEO. Recognizing the need for immediate action, he focused on rebuilding the company’s fractured supply chain.
But beyond the call for stronger support of existing aircraft in the field, one message kept rising to the surface: operators wanted more. More power. More lift. More capability. And while those features already exist in MD’s newest models, pilots weren’t asking for something new — they wanted those upgrades in the helicopters they were already flying: the tried-and-true D, E, and N models that dominate much of the global fleet. As it turned out, this wasn’t just a regional request from New Zealand — it echoed across MD’s entire legacy customer base. Ryan Weeks and his team took note — and put a plan in motion.
The Plan
“We analyzed the fleet and saw that the average age of these aircraft is getting up there,” said Weeks. “So, we asked ourselves, ‘What are we going to do? Are we just going to milk it until we know there’s nothing left? Or do we continue to make improvements to keep those aircraft relevant and safe with higher performance and keep that fleet flying?’ [The latter] not only helps the operators, but it also helps the authorized MD network and our business.
“It turns out that all these ideas had been conceptualized 30 or 40 years ago. They had already been flying the D models with these bigger engines back when it was Hughes,” Weeks continued. “I was being asked about all of these modifications, and I started talking to engineering. They told me, ‘Yeah, here’s the test report from 1984, here’s the test report from 1993,’ and we said, ‘Well, why don’t we do this?’ ”
With a renewed focus on strengthening support for the existing fleet and restoring MD’s standing in the rotorcraft market, the decision to pursue a product enhancement initiative became self-evident.
“As we’re working on getting production running along at a faster rate, we realized that this was something we could do to help ourselves and to help the customer, to make the business stronger, to make the MD network stronger — because we will flow all of these upgrades exclusively through the network,” Weeks said. “The operator is going to get more performance out of the aircraft, and we’ll just continue to reestablish the reputation of an OEM that actually cares about its fleet and its operators.”
Ramon Moro, MD’s director of engineering, was among the engineers who collaborated closely with Weeks in shaping the Super D project. “When Ryan joined the company, he worked with me extensively,” said Moro.
“We came up with the plan to do the Super D program, and he laid out the entire rollout going from the Super D20B to the 530N and the C30 engine upgrades. It was his vision. His primary goal was getting the spares market going and making sure the customers were taken care of. But he also started looking at how to bring value to the existing market of MD aircraft that are out there.”
Moro and Weeks discussed the uniformity across the product range. “If you look at the depth of the 500 lineup — the C, D, E, F, and N models — they share the same fuselage, the same transmission, the same fuel cell system, the same landing gear system, and for the most part, the same family of engines,” Moro said. “Whether it’s a C20, C30, or C47 engine, they all fit in that fuselage. That commonality allows for growth in the product. So, we talked about what do we do? How can we add value? That is how we came up with this solution.”
Modifications to the baseline D model include six-inch-longer main rotor blades and two-inch-longer tail rotor blades. Brent Bundy Photos
The Offering
What Weeks and the MD team developed is the Fielded Fleet Upgrades. Introduced in early 2024 at Heli-Expo, this strategy — once fully implemented — will comprise a series of “Super” upgrade packages for the D, E, and N model MD 500s. The program is designed to complement the long-standing 500E to 530F conversion process.
The first upgrade phase slated for Federal Aviation Administration (FAA) certification and near-term availability is the Super D20B. Modifications to the baseline D model include six-inch-longer main rotor blades and two-inch-longer tail rotor blades. These enhancements necessitate the integration of the F model empennage, featuring updated vertical and horizontal stabilizers, as well as an eight-inch extension to the tail rotor gearbox and a slightly reconfigured tailboom. Despite retaining the existing Rolls-Royce 250-C20B engine, the Super D20B delivers a notable performance improvement, increasing the internal maximum gross weight (MGW) from 3,000 lb. (1,360 kg) to 3,350 lb. (1,520 kg) — a gain of 350 lb. (160 kg) — without altering the powerplant.
“With that added lifting capability comes a safety margin, with the ability to also autorotate at that higher weight,” Moro said.
The performance improvements delivered by the upgrade are considerable, and it’s offered at a list price of $350,000 (if you’re not switching engines), including labor.
“At normal temperatures and altitudes, you’re getting 350 lb. of max gross weight for less than $1,000 per pound,” said Weeks. “That is a value proposition almost unheard of in this industry.”
He also emphasized the accessibility of the upgrade, noting that — like other enhancements recently opened to MD’s global support infrastructure — these modifications can be performed at any of the 34 MD Authorized Service Centers worldwide.
The Super D20B is nearing availability, with customer orders already being accepted. It will serve as the initial offering in a broader series of upgrades planned across the MD 500 product line.
For D model aircraft, additional configurations will include the Super D20R, which integrates the D20B modifications on airframes equipped with the 250-C20R engine. Following that, the Super D30 package will pair the new rotor blade and empennage enhancements with an upgraded 650-shaft horsepower (shp) 250-C30 engine, significantly boosting performance.
E model operators who do not require or desire a full E-to-F conversion will soon have the option to select the Super E configuration. This variant includes the aerodynamic and structural upgrades, while retaining the existing smaller powerplant, resulting in a 300 lb. (135 kg) increase to the internal maximum gross weight.
For the N model, which features the NOTAR system, the Super N variant will replace the 450-shp 250-C20R engine with the more powerful 250-C30R, delivering substantial improvements in available power and overall performance.
Top left: MD Helicopters’ director of engineering, Ramon Moro. Brent Bundy Photos
Future developments include optional glass cockpit avionics for all models, and a C30 engine upgrade — excluding rotor and empennage modifications — for both D and E models.
“This is a modular approach,” Weeks said. “Not everyone will want or need every stage of the upgrade.” He offers as an example the option to upgrade one step at a time, deferring costs to following years. “If you want to get these performance gains but can’t afford a new engine or a full upgrade and are working in non-hot and/or high conditions, you could opt for the Super D20B this year and once you’ve earned some money from that aircraft, you could then come back and do the C30 modification at a later date.”
This method will not only allow staggered improvements to the aircraft, but it will also allow an operator, if desired, to take their D model, with a C20B engine, all the way up to what would essentially be a round-nose F model with a glass cockpit for $1.2 million.
The Results
On a characteristically hot June morning at MD Helicopters’ production facility in Mesa, Arizona, Vertical had the opportunity to evaluate the benefits that will soon be available to D model operators. With the MD Super D20B configured at its increased maximum gross weight (MGW) of 3,350 lb., liftoff and departure from Falcon Field were executed without incident, demonstrating no discernible impact on performance.
During the brief flight north toward Saguaro Lake and through the adjacent mountainous terrain, the Super D20B consistently delivered performance metrics on par with, or superior to, those of the baseline D model — even with the 350-lb. MGW increase. The aircraft exhibited enhanced stability and control, particularly noticeable during low-level maneuvering along the winding path of the Salt River.
Still operating near MGW, the aircraft completed an approach and landing in near brown-out conditions. This phase further validated the effectiveness of the Super D20B upgrade package—achieved without any engine modifications — in enhancing the platform’s responsiveness and overall handling in demanding environments.
Program test pilot and former MD chief pilot Jay Wigginton expressed his initial surprise at the aircraft’s performance throughout the upgrade evaluation. “This flight test procedure was pretty much effortless; it was performing right out of the gate,” he said.
Wigginton emphasized the Super D’s responsiveness and capability, particularly in challenging conditions. “One of the things that stood out in the testing is how agile the Super D is and how well it performed, especially at altitude. When we did the low-speed controllability, we had better margins than I ever remember in the base D models. Pedal authority was dominant, even at 7,000 feet [2,130 meters].”
According to Wigginton, the performance gains extended well beyond expectations. “We had great climb rates all the way up to 12,000 feet [3660 meters], and it would have kept going if we had had oxygen. And that was at MCP (maximum continuous power), so we weren’t even dipping into the five-minute takeoff power.” Confident in the potential for success, he concluded, “This is taking a great helicopter and making it even better. It’s a super smooth aircraft, and it’s going to be a win-win for whoever decides to do it.”
Right: Program test pilot Jay Wigginton. Brent Bundy Photos
Weeks summarizes the efforts being made. “These enhancements are engineered to deliver measurable improvements in performance, stability, and maintainability, ensuring the existing fleet remains mission-capable for years to come.”
The Super D20B is more than an upgrade — it’s the opening act of MD’s larger transformation. It’s a bold demonstration of the company’s ability to meet customer needs with agility, innovation, and a long-term vision. With additional legacy upgrades already in development and new aircraft platforms on the horizon, MD Helicopters is proving it can honor its heritage while forging a new path forward.