90 Signals Unit


90 Signals was formed on 1 April 2006 by bringing together several existing Air Combat Service Support Units that were charged with communications related tasks. It has since grown further with the addition of 591 Signals Unit at RAF Digby and the 900+ personnel on the Unit are required to ensure delivery of Information Services whenever and wherever they are required. A significant percentage of the Unit is focused on support to expeditionary operations with a constant deployed presence in current operational theatres. 

Mission: ‘To support airpower through the delivery of assured information and communication services.’

Vision: ‘To Ensure 90 SU is manned, motivated, equipped, supported and trained to fulfil its Mission today, tomorrow and in the future.’


90 Signals Unit, RAF Leeming, Northallerton, DL7 9NJ.

Portrait of Group Captain Ian Chesworth MSc MA BEng MIET RAF

Officer Commanding

Group Captain Ian Chesworth MSc MA BEng MIET RAF

Group Captain Chesworth joined the RAF as a direct entrant airfield technician in 1988. He commissioned in 1996 and earned a cadetship to RMCS Shrivenham, graduating in 1999 with a 1st Class BEng in Electrical Engineering.  He deployed to Afghanistan twice during Op HERRICK in command and staff roles, and on Op RESINATE (South), KIPION and ELLAMY. His Advanced Command and Staff Course in 2012 was followed by tours at Air Command, PJHQ and ISS. He was promoted to Group Captain in 2016 and arrived at 90 Signals Unit from the post of Deputy Head, Cyber at Joint Forces Command.

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