The Grob 109B motor glider, known by the RAF as the Vigilant T1, is used by the Air Cadet Organisation to give basic flying and gliding training to air cadets. The aircraft is built in Germany, but it has been modified to meet the RAF's training requirements by the inclusion of an additional throttle in the cockpit and an increase in the maximum take-off weight. The Vigilant is currently used by 16 Volunteer Gliding Squadrons (VGSs), located at various sites around the UK. Their role is to train air cadets in basic flying techniques and to enable them to reach a standard where they are able to fly solo.
The Vigilant T1 is a cost-effective, modern aircraft. Its docile handling characteristics, combined with good fuel economy, make it an excellent training aircraft for cadets and instructors alike.
The aircraft is appearing as part of the Air Tattoo's Queen's Diamond Jubilee celebrations.