training to prepare aircrew for the front line, where advanced synthetic training is commonplace. Initial training The Grob Tutor T1 equips fifteen University Air Squadrons, which provide university students an opportunity to undertake an RAF training syllabus, which includes first solo, as well as air navigation, aerobatics and formation flying. These units are co-located with Air Experience Flights, which share the same aircraft and facilities and provide air experience flying to the Air Training Corps and Combined Cadet Force. The Tutor is also flown by No. 16 Squadron and No. 115 Squadron based at RAF Wittering. Volunteer Gliding Squadrons also provide air experience flying to cadets using the Grob Viking T1 conventional glider. Due to an airworthiness issue in April 2014, the Viking fleet and the Grob Vigilant T1 fleet were grounded for a two-year period, although Viking operations have subsequently resumed. The Vigilant was unexpectedly withdrawn from service in May 2018, a year earlier than planned. A contract tender was initiated in February 2018 to replace this capability from 2022 onwards. Elementary training The Grob Prefect T1 was introduced to RAF service in 2016 as its elementary trainer. The 23-strong fleet is based at RAF Cranwell and RAF Barkston Heath in Lincolnshire where they are operated by No. 57 Squadron. On completion of elementary training, aircrew are then streamed to either fast jet, multi-engine, or rotary training. Basic fast jet training Basic fast jet training is provided on the Beechcraft Texan T1, which replaced the Short Tucano T1 in November 2019. The Texan is a tandem-seat turboprop aircraft, featuring a digital glass cockpit. It is operated by No. 72 (F) Squadron based at RAF Valley in Anglesey which provides lead-in training for RAF and Royal Navy fighter pilots prior to advanced training on the BAE Hawk T2. The first two Texans were delivered in February 2018 and by December 2018 ten aircraft had arrived at RAF Valley. Four additional Texans were delivered on 3 November 2020. Advanced fast jet training The BAE Hawk T2 is flown by No. IV (AC) Squadron and No. XXV (F) Squadron based at RAF Valley. The latter provides initial Advanced Fast Jet Training (AFJT), while pilots who graduate on to the former squadron learn tactical and weapons training. After advanced training aircrew go on to an Operational Conversion Unit (OCU) where they are trained to fly either the Typhoon FGR4 (No. 29 Squadron at