At the Farnborough International Airshow in the U.K., Boom unveiled Overture’s flight deck, built around technology from partner Honeywell, and predicted it will have a full-scale engine core operational by 2025. The company also announced Tuesday it secured a Symphony assembly and testing facility through an expansion of its existing partnership with StandardAero.

Boom aims to fly Overture in 2026 ahead of a planned 2029 commercial rollout with airlines worldwide. A supersonic demonstrator aircraft, the XB-1, completed its maiden voyage in March.

Overture’s state-of-the-art flight deck runs on Honeywell’s Anthem avionics suite, which is also the system of choice for electric vertical takeoff and landing (eVTOL) aircraft manufacturers Lilium and Vertical Aerospace.

According to Boom, it will be the first airliner to feature force-feedback sidesticks, which give pilots a physical response to the aircraft’s movement as well as inputs made by the copilot or autopilot.

Like something out of a science fiction film, Overture pilots will don augmented reality goggles during takeoff and landing. The headset, built by Universal Avionics, uses multiple cameras and sensors to fill any gaps in the pilot’s vision. Boom says this is intended to eliminate the droop nose configuration seen on aircraft such as Concorde—the only successful supersonic airliner in history. The views seen through the goggles will also appear on the flight display, and an autolanding system will assist pilots on the way down.

Breakers and buttons are replaced by high-definition, 17-inch touchscreen displays, while some physical controls such as stick, throttle, and landing gear remain. However, Boom says all aircraft functions can be accessed through software, which will receive routine over-the-air upgrades.

Already, the new flight deck has been tested by real-world airline, business, and military pilots, including Mike Bannister, the former chief Concorde pilot for British Airways. In a recent evaluation, commercial airline pilots cruised over the Atlantic Ocean at supersonic speed before flying into London Heathrow Airport (EGLL).

“After experiencing Overture’s flight deck, which is incredibly well designed and delightful to fly, my excitement and enthusiasm for this aircraft has only intensified,” said Bannister, who now works as an aviation consultant.

Separately, Boom gave several updates on the progress of its Symphony engine program, most notably that it expects to have a full-scale engine core operational within 18 months despite unveiling the program less than two years ago.

The company will collect data on the core via testing, which will inform the development of other components such as the compressor and turbine section. Those parts will come from newly announced partner ATI Inc.

Fuel nozzles and other 3D-printed parts have already been produced, and Boom has begun testing certain hardware components. It plans to conduct more than 30 engine hardware rig tests with partner Florida Turbine Technologies (FTT), which helped design the technology.

“We are on schedule as we pursue critical component rigs for compressors, combustors, and bearings and are developing a ‘Sprint Core’ engine demonstrator that will provide valuable confirmation of engine component performance prior to finalizing the engine design,” said Stacey Rock, president of turbine technologies for FTT owner Kratos.

Symphony engines will be built and tested at a StandardAero facility in San Antonio, which Boom projects will one day include 100,000 feet of manufacturing space. The company plans for its partner to produce as many as 330 engines per year.

“We are excited to expand our role to include the assembly and testing of Symphony engines, further supporting the development of next-generation flight with Boom,” said Russell Ford, CEO and chairman of StandardAero.

Next up for Boom will be the second test flight of the XB-1, a smaller, less powerful version of Overture.

The company’s flagship model is intended to carry 64-80 passengers at Mach 1.7—just over 1,300 mph, twice the speed of subsonic airliners—while cruising at 60,000 feet.

Blake Scholl, founder and CEO of Boom, previously told The New York Times that the company’s goal is to fly passengers anywhere in the world within four hours for just $100. Concorde, for comparison, flew at Mach 2.0 and cost passengers thousands of dollars per trip. 

Unlike Concorde, though, Overture can run on 100 percent sustainable aviation fuel. The aircraft will only fly at supersonic speeds over water, since the FAA has banned those flights over land.

So far, Boom has racked up more than 130 orders and preorders for Overture, including from United, American, and Japan Airlines.

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It is not uncommon for air traffic control to pose this question to pilots on IFR flight plans approaching certain airports when the weather is VFR. In daylight, when the visibility is good, the winds calm, and the pilot familiar with the airport—and the approach is a straight in—the visual is no big deal.

But throw in weather, fatigue, low light, pilot unfamiliarity, and a circle to land, and it’s a different event.

Honeywell Aerospace is trying to mitigate these risks, expanding its navigation database to offer flight management system (FMS) guided visual procedures as a stand-alone option.

According to Jim Johnson, senior manager of flight technical services at Honeywell, the visual approaches are created in collaboration with Jeppesen. The instructions for the guided visuals look like Jeppesen approach plates but carry the caveat “advisory guidance only” and “visual approach only.” In addition, the symbology on the approaches differs in a handful of ways.

“The FMS-guided visual provides a lateral and vertical path from a fix fairly close to the airport all the way down to the runway,” says Johnson. “You can hand fly them or couple them to the autopilot.”

Visual into KTEB

One of the first guided visual approaches was created for the descent to Runway 1 at Teterboro Airport (KTEB) in New Jersey.

The airport sits in a very industrialized area with the runway blending into warehouses and business parks. Honeywell provides a video of the visual approach on its website that illustrates the value of having that helping hand. Having the extra vertical and lateral guidance from a mathematically created visual procedure allows pilots to better manage their approach, configuring the aircraft in an expedient manner to avoid “coming in high and hot” in an improperly configured aircraft.

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This is quite helpful when the aircraft needs to circle to land, says Carey Miller, pilot and senior manager of technical sales at Honeywell.

“Going into Runway 1 at Teterboro on the visual, you are not aligned with the VASI,” Miller says. “There is no vertical guidance, which can lead to a dive to the runway. Add a moonless night or gusty winds, and it can be quite challenging. Not being able to see the airport is a detriment to your energy management. The visual approaches, when coupled to the autopilot, eliminate the guesswork and the overbanking tendency that can lead to stalls.”

Adds Johnson: “The aircraft will fly constant radius turns, [and] you will be on the same ground track every time because the computer knows how to manage the vertical and lateral path. It gets rid of the pilot drifting down or turning early because of the winds.”

Airspace Guidance

The guided visual procedures created thus far have come from suggestions from Honeywell customers, including a visual approach to Chicago Executive/Prospect Heights Airport in Wheeling, Illinois (KPWK). KPWK is in Class D airspace, 8 nm from Chicago O’Hare International Airport (KORD). The Class B airspace for KORD sits above KPWK. There is a V-shaped cutout with various altitudes over KPWK.

The guided visual can help the pilot avoid clipping the Class B airspace during the circle to land—and the dreaded phone call with ATC that results.

The Creative Process

Each approach is created using software tools that take into account the airspace and terrain at the airport, then test flown in simulators to check for flyability.

According to Johnson, the suggestions for where to offer the guided visual approaches come from their customers.

“There are a lot of secondary and regional airports in the U.S. that have both terrain and airspace considerations that make visual approaches very challenging,” says Johnson. “For example, Van Nuys, California [KVNY], has both airspace challenges and a ridge nearby.”

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In some cases, the team may opt to create a visual approach as an overlay to improve safety at airports where closely spaced simultaneous approaches are in use. As this issue was going to press, Honeywell was working on an approach to Runway 28R/L at San Francisco International Airport (KSFO). The visual approach has a briefing sheet with textual guidance, and Honeywell has literally drawn a picture of it.

During development each procedure is flown in a simulator, using a specific briefing sheet that is checked and double-checked for accuracy and usability. Each approach has the ability to be coupled with the autopilot.

Miller cautions it is important to recognize that the visual procedures are not considered instrument approaches in the traditional sense.

“Do not request it as an approach, because ATC will not be aware of it,” Miller says. This information is emphasized on the procedure briefing sheet that accompanies each guided visual approach.

The guided visual approach is loaded in the FMS just like an instrument approach. The pilots can access them with a few pushes of a button, just as they do Jeppesen approaches.

“To use the visual approaches, the customer needs to have a Honeywell-equipped aircraft, and in addition to the FMS database, for an additional $2,000 per year they receive the visual approaches,” says Miller.

To request an approach, contact Honeywell at FTS@honeywell.com. It takes approximately four weeks to put one together.

Coming Full Circle

In many ways, the visual approach procedures represent a modern treatment to the first approaches created by Elrey Jeppesen—yes, that Jeppesen—who became a pilot in 1925 at the age of 18. At the time, there was no such thing as maps purpose-built for aviation. Pilots relied on road maps—which often weren’t terribly accurate, following railroad tracks from town to town or by pilotage and dead reckoning.

In 1925, Jeppesen went to work as a survey pilot and by 1930 was working for Boeing Air Transport, the precursor to United Airlines. This was decades before air traffic control and electronic navigation systems were created. Jeppesen bought a small notebook and filled it with information about the routes he flew. In it there were drawings of runways and airports and information that pilots needed to know, like the elevation of water towers, telephone numbers of farmers who would provide weather reports, and dimensions of the runway and its distance from the nearest city.

In 1934, this evolved into the Jeppesen Company and the notebook into the en route charts and terminal area procedures we know today. Much of Jeppesen’s flying was done in the Pacific Northwest. The Museum of Flight in Seattle is the keeper of the Elrey B. Jeppesen Collection, and for many years there was a replica of his first notebook on display in the Red Barn.

We think Captain Jepp would appreciate how far the approaches he inspired have come.

This column first appeared in the January-February 2024/Issue 945 of FLYING’s print edition.

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