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Defence for F-35A (further links at original):
Mark
Ottawa
The F-35A Is Set To Finally Get Chaff Countermeasures To Confuse Enemy Radars
These cartridges full of radar-reflecting material have been curiously absent from the stealthy fighter's already highly capable defense suite.
Air Force is hoping to integrate a new, advanced chaff countermeasure onto its F-35A Joint Strike Fighters next year, according to a report. The cartridges, which release radar reflective material to blind and confuse enemy aircraft and air defenses, are a staple across many of the service's other combat aircraft, but have been curiously absent from the stealthy F-35's otherwise extensive defensive suite.
Aviation Week's Defense Editor Steve Trimble, a good friend of The War Zone, was first to spot the detail on Sept. 9, 2019. The Air Force included the information about the new chaff cartridge, known presently as the ARM-210, in a draft environmental impact statement, dated August 2019, regarding the basing of F-35s at various Air National Guard facilities. The report includes a host of information on how the aircraft might impact their surrounding environments, including the potential release of countermeasures, such as infrared decoy flares and chaff.
"The ARM-210 chaff proposed for use by the F-35A is currently unavailable and undergoing operational testing," according to the environmental review. "It is expected to be available for use in 2020."
It is unclear whether this applies to the U.S. Marine Corps F-35B or U.S. Navy F-35C variants, as well, or any of the three variants in service with foreign air forces. The F-35's use or potential use of chaff has long been something of a debate, in general. Recent U.S. military budget documents and other sources make no mention of it among the aircraft's expendable countermeasures – flares and towed decoys – which had suggested that it was, indeed, a capability the Joint Strike Fighter lacked and might not necessarily have needed given its stealthy design.
Lockheed Martin
An image showing the general layout of the defensive systems on a Marine Corps F-35B. The general location of the infrared countermeasures (IRCM) dispensers, as well as Radiofrequency Countermeasures (RFCM) dispenser, loaded with flares and towed decoys respectively, are the same as on the F-35A. The IRCM dispensers will likely be used to fire the new ARM-210 chaff cartridges in the future.
However, F-35 simulators have included the ability to replicate this functionality, according to Trimble. He also noted that a briefing in 2018 from U.S. Navy Vice Admiral Mathias Winter, then head of the F-35 Joint Program Office (JPO), had included a reference to "advanced chaff" as being part of the still-in-development Block 4 upgrades for the Joint Strike Fighters.
Some have asserted that the F-35 doesn't use chaff. And that sort of makes sense. There's no evidence I'm aware of that its stealthy stablemates, the F-22 and B-2, possess a chaff dispenser. But you can find pic's of F-35 simulator screens showing a line for chaff dispensers. /2
— Steve Trimble (@TheDEWLine) September 9, 2019
The ongoing testing of the ARM-210 now confirms that at least the Air Force plans to integrate chaff into its F-35As in the near future. This cartridge's specifications, and how it differs from RR-180 and RR-188 types the service already has as a countermeasure option for other combat aircraft, is unclear.
"ARM-210 chaff is similar to the RR-180 and RR-188 chaff currently in use by the F-16, F-15, and A-10 aircraft proposed for replacement [with the F-35]," the environmental impact report says, without offering any other details. "A bundle of chaff consists of approximately 5 to 5.6 million fibers that are cut to reflect radar signals, and when dispensed from aircraft, form an electronic 'cloud' that breaks the radar signal and temporarily hides the maneuvering aircraft from radar detection," it says more generally.
Chaff, which dates back to World War II, originally consisted of aluminum strips cut to various lengths. More modern examples, use metallicized synthetic fibers, which help them hang in the air longer, offering more persistent effects. The Armtec RR-188, for example, uses bundles of aluminum-coated silica fibers. There have been a number of chaff releases within the United States in the past few years as part of training exercises that have highlighted just how long-lasting and far-ranging the clouds can become depending on release altitude and environmental factors. The size and composition of the fibers are directly connected to what radar bands the chaff affects, which can make them particularly effective against specific threats...
https://www.thedrive.com/the-war-zone/29734/the-f-35a-will-finally-get-chaff-countermeasures-to-confuse-enemy-radars-next-year
Mark
Ottawa