OASC: a complete guide to RAF officer & aircrew selection
OASC — the RAF's Officer and Aircrew Selection Centre at RAF College Cranwell — is where your application is put to the test across aptitude, interviews and exercises. This guide walks through what OASC is, the stages you'll face, how the CBAT fits in, and how to prepare for the parts you can actually train — so you arrive ready, not guessing.
CBAT Ready is an independent study aid, not an official RAF resource. Always confirm the current process and requirements at the official RAF recruitment site.
What is OASC?
OASC stands for the Officer and Aircrew Selection Centre, the RAF's selection centre at RAF College Cranwell. It's where candidates for officer and aircrew roles are assessed to decide whether they have the aptitude, motivation and qualities the RAF needs before it commits to training them. Clearing OASC is the gateway to Initial Officer Training (MIOT).
OASC isn't a single test — it's a process made up of several distinct assessments, each looking at a different side of you: your raw aptitude, how you think and communicate under pressure, and your motivation and understanding of the role and the Service.
The stages of OASC
The assessment brings together several stages. Broadly, expect:
- Aptitude testing — the CBAT, the battery of computer-based tests measuring the abilities aircrew and control roles demand.
- The Filter / Suitability interview (historically SHINE) — a single-recruiter interview about you and your motivation.
- The board interview — the tougher, multi-officer interview that challenges your answers in depth.
- Exercises — for many roles, planning, problem-solving and leadership tasks, individually and in groups.
- Fitness & medical — the Pre-Joining Fitness Test (PJFT) and a medical run alongside selection.
The exact mix, order and length depend on your role and the current format, which changes over time — treat any specific account as a guide and confirm the current process officially.
The CBAT at OASC
The aptitude portion of OASC is the CBAT — a run of timed, computer-based tests covering mental maths, spatial and navigational reasoning, memory, attention and hand-eye coordination. It's the part of OASC you can prepare for most concretely: you can't learn the answers, but you can remove the surprise by getting familiar with every format and rehearsing the tracking and multitasking tests that are impossible to improve on cold.
The interviews: SHINE and the board
OASC's interviews are as decisive as the aptitude tests, and just as trainable. The Filter / Suitability interview (historically SHINE) comes first: a single recruiter, focused on you — your background, your motivation, and how clearly and confidently you put yourself across.
The board interview is the harder stage: typically two officers who interrupt, challenge and drill down through your motivation, your chosen role, the RAF, air power and current affairs. They're testing not just what you know but how you hold up when pushed. The best preparation is rehearsal under realistic pressure.
Exercises & fitness
For many roles, OASC also includes exercises — planning and problem-solving tasks and group leadership scenarios designed to see how you think, communicate and work with others under time pressure. There's no way to memorise these; the preparation is being calm, structured and a good team member.
You'll also need to pass the Pre-Joining Fitness Test (PJFT). CBAT Ready includes a free, tailored PJFT training plan built around your test date, with a run tracker — so fitness is one less thing left to chance.
How to prepare for OASC
- Prepare the aptitude tests properly. Learn every CBAT format, build accuracy before speed, and rehearse the psychomotor and multitasking tests you can't improve on cold.
- Know yourself and your motivation cold. Why the RAF, why this role, what you've actually done to prepare — with specifics, not slogans.
- Understand the role and the Service. The board expects real knowledge of your role, the RAF's structure, air power and current affairs.
- Rehearse interviews out loud. Full mock interviews under pressure are the single biggest lever — practise being interrupted and challenged.
- Get the fitness in early. Build the PJFT into your plan so it's a formality, not a scramble.
Frequently asked questions
What is OASC?
OASC is the RAF's Officer and Aircrew Selection Centre, based at RAF College Cranwell. It's where candidates for officer and aircrew roles are assessed across several stages — aptitude testing (the CBAT), interviews, and, for many roles, exercises — to decide suitability for training. Passing OASC is the gateway to Initial Officer Training.
What happens at OASC?
Broadly, OASC assessment covers the computer-based aptitude tests (the CBAT), one or more interviews — the Filter/Suitability interview (historically SHINE) and the main board interview — and, depending on the role, planning and leadership exercises. Fitness (the PJFT) and a medical sit alongside the selection process. The exact format and length vary by role and can change, so confirm the current process with the RAF.
How do I prepare for the OASC interview?
Know yourself and your motivation cold (why the RAF, why this role, what you've done to prepare), understand the role and the RAF's structure and current affairs, and practise answering out loud under pressure — the board will challenge and probe your answers. Rehearsing full mock interviews is the single most effective preparation. CBAT Ready includes live voice mock interviews for both the SHINE and OASC boards.
Is OASC the same as the CBAT?
No — the CBAT is one part of OASC. OASC is the whole selection process; the CBAT is the battery of aptitude tests within it. You'll also face interviews and, for many roles, exercises. Strong CBAT scores get you through the aptitude gate, but the interviews and other stages still have to be passed.
What is the difference between the SHINE and OASC interviews?
The Filter/Suitability interview (historically SHINE) comes first: a single recruiter, focused on you — your background, motivation and how you present yourself. The OASC board interview is the tougher stage: typically two officers who interrupt, challenge and drill into your motivation, the role, the RAF, air power and current affairs. Both are trainable, and both reward rehearsal.
How long does OASC take?
It depends on the role and the current format — assessment can run across one or more days. Because the exact structure and duration change over time and differ by role, always check the current details on the official RAF recruitment site rather than relying on older accounts.
Disclaimer. CBAT Ready is an independent study resource and is not affiliated with, endorsed by, or representing the Ministry of Defence or the Royal Air Force. Practice material is created to build the underlying skills based on publicly available information. The exact OASC process, tests and standards are set by the RAF and can change — always confirm the current process at the official RAF recruitment site.