New Marine One helicopters the US spent $5 billion on aren't allowed to carry the president because they could scorch the lawn

• The US has spent $5 billion on a fleet of new helicopters to transport the president.
• But the VH-92 continues to scorch the White House lawn, Bloomberg reported on Tuesday.
• This years-long problem has sidelined the helicopters from carrying Biden for now. 

The new Marine One helicopters, part of a program that the US spent $5 billion on, still can't carry President Joe Biden because there's still a risk they will scorch the White House lawn, according to a new report.

The rotors and engine exhaust from the Sikorsky-manufactured VH-92 Patriot will occasionally burn the grass when it lands, an issue that was initially identified in 2018, Bloomberg reported on Tuesday.

Because of this unrelenting problem, the new VH-92 is only carrying White House officials or Secret Service personnel instead of the president himself and is restricted to landing on paved surfaces, the report said. Older VH-3D Sea King helicopters will continue to transport Biden from the iconic, traditional South Lawn takeoff spot.

The executive-transport fleet consists of VH-3D and VH-60N helicopters, which are designated with the "Marine One" callsign when Biden is aboard. The US military sought to replace these aging aircraft with the newer VH-92 systems under the $5 billion program and has already secured 20 of them from Lockheed Martin, Sikorsky's parent company.

The VH-92's lawn-scorching problems were first discovered in 2018 during the Trump administration, kick-starting an effort to resolve the issue.

The Government Accountability Office, a watchdog agency, noted in a June 2020 report on the matter that the military had "yet to demonstrate that it can meet the requirement to land on the White House South Lawn without causing damage."

"Heat from the auxiliary power unit and/or engine exhaust continue to damage the lawn under certain conditions," the GAO wrote at the time.

"The program is studying solutions," the GAO said, noting that those included certain "aircraft design changes, lawn surface treatments, and operational procedural changes to minimize landing zone risks."

In early 2021, the Department of Defense's operational testing and evaluations office determined that "the damage was found to be primarily due to engine exhaust, auxiliary power unit exhaust, and discharge of aircraft fluids onto the grass."

However, in its 2023 annual report, which was released earlier this year, the Pentagon said the VH-92 is "operationally effective for administrative lift missions" after the helicopter's "voice communications" were improved, without specifically mentioning the lawn issue.

Neither Lockheed Martin, nor the White House, immediately responded to Business Insider's queries on the reported continuation of the VH-92 problems.

A spokesperson for the defense contractor, meanwhile, told Bloomberg that the company thinks it has found a way to fix the issue.

"We have been working in close collaboration with our customer and have an agreed upon landing zone solution with testing planned to validate and ensure the aircraft meets that specific operational requirement," Melissa Chadwick told the outlet.