Military Aviation

USAF Research Laboratory sprayed methyl salicylate on F-15E Strike Eagle to test its chemical/biological protective capability

This F-15E Strike Eagle test is one of many evaluations set to be conducted across multiple DoD airframe platforms over the next few years.

The Air Force Research Laboratory’s 711th Human Performance Wing and the 28th Test and Evaluation Squadron executed an in-flight vapor purge test in a F-15E Strike Eagle, Aug. 16-19, 2022.

As noted by Alert 5, the objective of the test by the 711th Human Performance Wing (711 HPW) was to evaluate cockpit environmental conditions after a chemical weapon attack. This F-15E test is one of many evaluations set to be conducted across multiple DoD airframe platforms over the next few years.

“In order to develop the next generation of aircrew protective equipment we need to determine what level of protection aircrew members need,” said Joel Huddleston, 28th TES deputy division chief, to 1st Lt Lindsey Heflin, 53rd Wing, for the article Air Force executes first in-flight Next Generation Aircrew Protection test in F-15E Strike Eagle. “By aggregating this data, we will be able to specialize the suits and ensure the warfighter is unencumbered.”

Analysts from the Air Force Research Laboratory’s 711th Human Performance Wing use the orange spray carts displayed to insert oil of wintergreen into the idling F-15E Strike Eagle prior to taxi at Eglin Air Force Base, Fla., Aug. 16, 2022. This test is part of a larger Department of Defense effort to evaluate cockpit environmental conditions after a chemical weapon attack

Similar to the C-130J Super Hercules vapor purge test that took place in 2020, analysts sprayed liquid methyl salicylate, also known as oil of wintergreen, into the idling jet prior to taxi. Engine heat then vaporized the liquid, allowing the chemical vapor to flow into the cockpit and expose the aircrew member.

Once airborne, the aircraft purges itself through the Environmental Control System, allowing aircrew members to remove their chemical/biological protective ensembles and respirators to complete the mission. An integrated test team goal during this event was to determine how long it takes for the purge to complete.

“Each aircraft is different in size and air capacity, which contributes to how quickly the chemical is purged from the aircraft,” said First Lieutenant Andrew DeNicola, 28th TES test engineer. “Even a small change in aircrew dexterity can affect how the plane flies or type of mission they can accomplish, so if we can minimize the time frame a member has to wear their protective gear it will improve operational Tactics, Techniques, and Procedures.”

Chemical, biological, radiological, and nuclear (CBRN) analysts from 711 HPW Airman Systems Directorate at Wright-Patterson Air Force Base, Ohio, conducted the test by providing equipment, developing testing methodology, and interpreting the results.

An Aircrew Flight Equipment member secures the zippers on the pilot’s vest radio pouch prior to flight in accordance with operational procedures. Securing the pouch zippers ensures that the test sensor remains secure in the event that the pilot would need to eject from the aircraft at Eglin Air Force Base, Fla., Aug.16, 2022. The equipment in the radio pouch provides valuable data to aircraft design teams and opportunities to enhance aircraft environments and improve aircrew equipment.

“The data helps us understand what goes on inside the aircraft when operating after a chemical weapon attack and flying in a contaminated environment,” said William Greer, senior CBRN analyst from the 711 HPW. “What we learn ultimately helps inform aircraft design teams on opportunities to enhance aircraft environments and, along with better aircrew equipment, enable aircrew to more execute their missions more effectively in a chemical threat environment.”

Another program element that is separate from aircraft testing involves the Man-In-Simulant Testing (MIST) on current aircrew flight equipment. This specialized testing takes place at the Dynamic Entry and Exit Test Module (DEETM) facility located at Eglin Air Force Base. The intent of MIST is to expose aircrew chemical ensembles to a variety of chemical simulants to determine the locations of any leaks and identify “hot spots.”

Combining this information with the flight data paints a more accurate picture of the chemical challenges aircrew members face, ultimately leading to improved protective measures.

The test event was led by a collaborative effort between the 53rd Wing, the 96th Test Wing, AFRL, and the Joint Program Executive Office for Chemical, Biological, Radiological, and Nuclear Defense.

This print is available in multiple sizes from – CLICK HERE TO GET YOURS. F-15E Strike Eagle 366th Fighter Wing, 391st Fighter Squadron, MO/90-0249 – Mountain Home AFB, ID – 2008

The 711 HPW leads the development, integration, and delivery of Airman-centric research, education, and consultation enabling the Air Force to achieve responsive and effective global vigilance, global reach, and global power now and in the future. Established under the Air Force Research Laboratory, the 711 HPW is comprised of the Airman Systems Directorate (RH) and the United States Air Force School of Aerospace Medicine (USAFSAM).

The Wing’s multidisciplinary workforce is comprised of more than seventy occupational specialties across science, technology, and aerospace medicine. Leveraging a convergent sciences approach and supported by state-of the-art research facilities and classrooms, the Wing provides the Air Force with unparalleled expertise to maximize Airman availability, enhance Airman performance, and ensure resource efficiency — now and in the future.

The 711 HPW also functions as a joint Department of Defense Center of Excellence for human performance sustainment and readiness, optimization, and enhancement through partnerships with the Naval Medical Research Unit-Dayton and nearby universities, industry, and medical institutions.

Photo credit: Ilka Cole / U.S. Air Force

This model is available to order from AirModels – CLICK HERE TO GET YOURS.
Dario Leone

Dario Leone is an aviation, defense and military writer. He is the Founder and Editor of “The Aviation Geek Club” one of the world’s most read military aviation blogs. His writing has appeared in The National Interest and other news media. He has reported from Europe and flown Super Puma and Cougar helicopters with the Swiss Air Force.

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