TSR Wiki > Careers > Career Options > Armed Forces Careers > The Royal Air Force > OASC


What is OASC?

OASC stands for Officer and Aircrew Selection Centre. OASC is located at RAF Cranwell, Lincolnshire. This is the final stage of assesment for Officer and Aircrew candidates.

What Does OASC Consist of?

OASC has recently been broken down into two parts; You will now visit RAF Cranwell for 2 days to complete the Aptitude Test only and if successful will be invited back to complete the remaining 3 days of OASC. The selection process is broken down into the following:

OASC Aptitude Test

Day One

You arrive at Cranwell and have an initial briefing. You will have the evening free to yourself.

Day Two

A 0615 start followed by Aptitude testing! The length of this test varies from depending on branch choice, but can last up to seven hours. These tests are computer based. You will be tested on such topics as; deductive reasoning, memory, spatial orientation, mental agility and hand/foot/eye coordination. These tests are designed to help identify abilities that the RAF, and your chosen branch are looking for. Lunch is taken during a half hour break towards the ends of the test.

Following your aptitude test you will be called for a review. You will be told how you performed and if you made the required aptitude score for your branch choices. All test results are confidential and someone will be there to advise you how your score affects your application, as well as an overview of any areas to improve. You will be informed whether or not you are progressing to the the second part of OASC, and if succesful will be contacted with dates to return to Cranwell and complete the remaining days of the OASC.

OASC Exercises, Interview & Fitness


Day One

You arrive at Cranwell and have an initial briefing. You will have the evening free to yourself.

Day Two

After breakfast, you will change into coveralls and bibs, break down into syndicates and commence the Exercise Phase.

First, your photo is taken with your assigned syndicate and number, for reference purposes.

The syndicates move to their respective syndicate rooms where they first partake in the Group Discussion: The group discussion is an informal discussion on current affairs topics which require no in-depth knowledge as such. Candidates are expected to produce valid comments and qualified opinions on the topics yet must be able to listen to the other members of the group. There are three topics and they may be such as, "Has technology made it easier to communicate or has it adversely affected the way we socialise?", "Is the Olympic Games in 2012 a good thing for Great Britain?".

After the group discussion comes the Group Planning Exercise: The Group Plan-ex involves a twenty minute private study period in which the candidates may, individually, look at the information presented before them and come up with a plan. After the twenty minutes comes a further twenty minutes (PLEASE QUALIFY - UNSURE) in which the syndicate may, together, discuss their options and formulate a plan. After the second period has elapsed, the boarding officers question each member of the syndicate on their plan.

Next are the exercises which assess your leadership potential:

Firstly, the candidates undergo the Hangar Familiarisation. This informs the candidates of what is to come during the hangar exercises, they are given safety information and some information on how to approach the tasks. This includes some demonstrations of various techniques that can be implemented.

After the Familiarisation, boarding officers collect their syndicates and take them to one of the Leaderless Exercises: The leaderless exercise is 30 minutes long. The candidates will be presented with a problem and will be expected to work together to accomplish the task.

After the Leaderless Exercise, candidates move on to the Command Situation Exercise: The CS Exercise is 15 minutes long. Each candidate will lead a command situation exercise, those who are not leading an exercise are still members of the team. The leader is taken away, briefed and then given a compulsory two minute planning period in which they may pick up equipment and obstacles, move things around and walk all over the exercise area. They are then told to call for their syndicate from across the hangar, brief their syndicate and accomplish the task.

Lunch follows completion of all the Leaderless Exercises.

You then take part in your Individual Planning Exercise before finishing for the day.

The OASC staff will review every candidates performance before deciding who will continue with the process and those who will not.

Day two may also involve you taking part in a hearing test whilst others take part in their Individual Planning.

Day Three

In the morning, the candidates who were unsuccessful with selection will be informed and taken for a debrief.

The remaining candidates will be taken to the medical board. Medicals will commence. Medicals are different depending on what branch is being applied for, but for aircrew it includes the following: Eyesight, Hearing, Blood Test (Day four), ECG, Anthropometrics, Physical Medical Examination

Meanwhile, some candidates may have their OASC Interviews in between medical examinations.

Candidates complete the fitness assessment which comprises of a Multi Stage Fitness Test (Bleep Test), press ups and sit ups. (SEE BELOW)

Upon completion of the fitness assessment, candidates return to their accomodation, change and leave OASC.

Correct as of 23 Oct 2012 (teasin_tina)

What Are The Fitness Requirements?

1.5 Mile (2.4 Km) Treadmill Run

You will be assessed by an RAF PTI, with you having control of the speed and will be on a zero incline. The PTI will inform you of your progress at periods throughout your run.

First set of figures (Higher time) is the Pass time (Amber). The second time is the Desired level of fitness (Green) (all times are in minutes.seconds)

AGE ............ MALE ............ FEMALE

17-29 ..... 11.11 / 10.12 ..... 13.23 / 12.08

30-34 ..... 11.36 / 10.32 ..... 13.47 / 12.33

35-39 ..... 12.00 / 10.55 ..... 14.13 / 13.05

40-44 ..... 12.26 / 11.11 ..... 14.48 / 13.35

45-49 ..... 12.54 / 11.40 ..... 15.19 / 14.18

50-54 ..... 13.27 / 12.04 .....

Correct as of 23 Oct 2012 (teasin_tina)

POSSIBLE EDIT: No longer 2.4k run; now a Multi Stage Fitness Test (MSFT) AKA Bleep (Beep) Test. (UNKNOWN PASS RATES) But if you can do the 2.4k in time the Beep test will be a walk in the park.

Pressup Test (time permitted: 1min)

First number represents Amber (Pass), Second number represents Green (Desired level of fitness)

AGE ..... 17-24 ..... 25-29 ..... 30-34 ..... 35-39 ..... 30-44 ..... 45-49.....
MALE ..... 20,40 ..... 19,37 ..... 18,34 ..... 17,31 ..... 16,28 ..... 15,25 .....
FEMALE ..... 10,20 ..... 9,19 ..... 8,18 ..... 7,16 ..... 6,14 ..... 5,12 .....

SitUp Test (time permitted: 1min)

AGE 17-24 25-29 30-34 35-39 40-44 45-49
MALE 35 31 27 23 19 15
FEMALE 25 22 19 16 13 10

What Are The Medical Anthropometric Measurements For Pilot/WSO?

(Correct as of July 2009, from OASC med form) PILOT:

Height: No height restriction
Weight: 57--94kg
Reach: 720mm min
Sitting height: 865--990mm
Buttock-knee: 660mm max
Buttock-heel: 1000--1200mm


Height: No height restriction
Weight: 57--94kg
Reach: 715mm min
Sitting height: 850--1005mm
Buttock-knee: 670mm max
Buttock-heel: 970--1200mm

Eyesight Requirements

Pilot; Uncorrected Acuity 6/6, Refraction range plano to +1.75. Cyl up to +0.75. That means you MUST have 6/6 vision with NO myopia but a small range of long sightedness is acceptable. You can have virtually no trace of astigmatism.

WSO: Uncorrected 6/24, correctable to 6/6, refraction -1.25 to +3, cyl to +1.25. So you must be correctable to 6/6 with glasses or contacts, and you can't have a myopia/long sightedness of less than -1.25 or greater than +3.

WSOp is uncorrected 6/24, correctable to 6/6, with a refraction range of -2 to +3. Linguists can get away with -4 to +4.

What Can I expect from the aptitude tests?

Some of the tests are the following: (From RAF Testing Methods Booklet)

Control of Velocity test (CVT)

Use a joystick left and right to hit the targets. The targets are small circles cascading down the screen but theres a delay between what you do, and the dot actually moving.

Instrument Comprehension (INSC)

A measure of general and spatial awareness using basic aircraft instrumentation (alt, art horiz, vertical speed, air speed, compass aswell as turn and bank). First part uses just the artificial horizon and compass to identify the correct orientation of an aircraft from a set of pictures, the second part uses all 6 instruments and given a number of verbal descriptions of orientation. You then have determine which description matches what you have on screen.

Sensory Motor Apparatus (SMA)

This is basically a tracking task. Using a joystick and pedals to move a dot both horizontally (pedals) and vertically (joystick), keep the dot as close to the target as possible. The dot is moved away forcing you to compensate.

Digit Recall

Short term memory test where you are presented with sets of numbers of varying length on screen, each being shown for about 10 secs. As soon as it disappears you have to type the number in.

Vigilance (VIG)

You are presented with a 9x9 matrix on screen. Each cell in the matrix is identified by numbers along the top and left hand side. You then are asked to do 2 tasks; 1 routine and the other priority. The routine tasks involves entering the cell number when a star appears in it, the priority task involves doing the same when an arrow appears. This has to be cancelled first by pressing a key then entering the cell number.

This is not finished yet...

Where to get help and practice for OASC

There are a number of changes to OASC in 2015, there are limited resources enabling you to practice effectively for OASC. You are able to attend a one day training course with www.passtheprocess.com

Also See

Why not read these other RAF Articles?

Try Learn together, TSR's study area

revision notes




a study planner

of discussions

Do you like sleeping in a cold room?
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE