100 questions written for Qatar Airways’s actual selection process. Below are 5 of them in full — the prompt, what the panel is really probing, a model answer, the red flags that fail it, and the follow-ups that come next. No account, nothing to sign.
Question 1 of 100·technical
Define the four forces in level flight and explain how each scales with airspeed.
What they are really probing: An opener. It is not testing the definitions, it is testing whether you can reason from them.
Model answer
Give the four quickly — lift, weight, thrust, drag — and say that in steady level flight lift equals weight and thrust equals drag, with the important qualifier that this is equilibrium, not a fixed relationship: change the speed and everything rearranges. Then do the scaling, which is the actual question. Lift and drag both vary with the square of the speed for a given angle of attack, which is why doubling the speed quadruples the available lift and why the wing needs a much smaller angle of attack to hold the same weight when it is fast. Weight does not vary with speed at all; it varies with fuel burn, which is why the aircraft that needed a high angle of attack at the start of a long sector needs less at the end and can climb higher. Thrust for a jet is roughly constant with speed and falls with altitude and temperature, which is the difference from a propeller, where thrust falls off as speed rises. Then the piece that turns a textbook answer into an operational one: drag is not one thing. Induced drag falls with speed because the angle of attack falls, and parasite drag rises with the square of the speed, so total drag has a minimum in between — the best lift-to-drag speed, which is your best glide, your best endurance reference and the speed the driftdown is built around. Close by connecting it to the flight deck: this curve is why maximum altitude changes as you burn fuel, why the aircraft feels different heavy, and why the speed you fly with an engine out is not the speed you would guess.
What fails this question
- — Definitions with no scaling
- — Treating drag as a single quantity
- — Not knowing thrust behaviour differs between jet and propeller
- — No link to anything operational
Follow-ups they ask next
- — Why is there a minimum drag speed?
- — How does burning fuel change the picture?
- — What speed do you fly with an engine out, and why?
Question 2 of 100·technical
Explain Vmcg and Vmca. Which limits V1, and why?
What they are really probing: A favourite. The answer is Vmcg, and the reason has to be about keeping straight on the ground.
Model answer
Define both precisely, because the difference between them is the whole point. Vmcg is the minimum control speed on the ground: the lowest speed at which, following a sudden failure of the critical engine, directional control can be maintained using rudder alone, without relying on nosewheel steering, and with the aircraft staying within a defined distance of the centreline. Vmca is the airborne equivalent: the lowest speed at which control can be maintained in the air with the critical engine inoperative, with a defined maximum bank towards the live engine — typically five degrees, and that bank matters because it reduces the speed at which control is possible. Then the answer: Vmcg limits V1 from below, because V1 is the speed at which you commit to continuing, and continuing means being able to keep straight on the remaining runway after the failure. A V1 below Vmcg would authorise a continued takeoff in a condition where you cannot hold the centreline, which is not a takeoff, it is a departure from the runway. So the floor on V1 is Vmcg and the ceiling is Vr. Then the factors, which is where the marks are: both speeds depend on thrust, so a derate lowers them and full thrust raises them; both depend on air density, so altitude and temperature reduce thrust and therefore reduce the speeds; and Vmcg is affected by the runway surface, because on a slippery surface the rudder can generate more side force than the tyres can resist. Close with the practical consequence: this is why a derated takeoff has different speeds and why V1 on a short, contaminated runway can be uncomfortably close to Vr.
What fails this question
- — Saying Vmca limits V1
- — Not knowing nosewheel steering is excluded from Vmcg
- — Forgetting the bank angle allowance in Vmca
- — No awareness that derate changes both
Follow-ups they ask next
- — Why is a small bank allowed in Vmca?
- — How does a derate change these speeds?
- — What happens to Vmcg on a slippery runway?
Question 3 of 100·technical
What is the International Standard Atmosphere and where is it used?
What they are really probing: Everyone can recite the numbers. Say what it is FOR and you have separated yourself.
Model answer
Give the numbers first, briefly: fifteen degrees Celsius at sea level, 1013.25 hectopascals, a lapse rate of about two degrees per thousand feet up to the tropopause at around thirty-six thousand feet, above which the temperature is treated as constant at about minus fifty-six and a half. Then say what it is for, which is what the question is really asking. It is a reference model, not a description of the weather — a fixed atmosphere against which aircraft performance, instrument calibration and altimetry can be defined so that a figure quoted by a manufacturer means the same thing everywhere. Every performance number you use is either quoted at standard conditions or corrected from them, which is why the deviation from standard, rather than the absolute temperature, is what appears in performance calculations. Then the operational consequences, and this is where a good answer goes. Above standard temperature the air is less dense, so thrust falls, true airspeed for a given indicated speed rises, takeoff and landing distances lengthen and the ceiling drops — which is the daily reality of operating from a hot Gulf hub in summer, where the temperature deviation is large and it drives payload. Below standard, the altimeter over-reads, which is why cold temperature corrections to minimum altitudes exist and why they are not optional in cold, mountainous places. Close with the pressure altitude and density altitude distinction, since it follows directly: pressure altitude is what the altimeter reads on standard, and density altitude is pressure altitude corrected for temperature — the number the aeroplane actually feels.
What fails this question
- — Numbers with no purpose
- — Confusing pressure altitude and density altitude
- — No awareness of cold temperature altimeter error
- — Not linking it to performance
Follow-ups they ask next
- — What is density altitude?
- — How does a 20-degree deviation affect your takeoff?
- — When do you apply cold temperature corrections?
Question 4 of 100·technical
What is buffet margin, and how do you use optimum and maximum altitude?
What they are really probing: Not a theory question — a cruise-management question. Talk about what you do with the FMS numbers.
Model answer
Define the margin as a load factor rather than a speed range, because that is how it is used: the buffet margin is how much g you can pull, or how much bank you can apply, before the onset of buffet — with 1.3g, roughly forty degrees of bank, being the conventional protection. Say why it shrinks with altitude: the low-speed buffet boundary rises in Mach terms as you climb because a given indicated speed corresponds to a higher Mach, while the high-speed boundary is fixed by the critical Mach number, so the two converge. Weight raises the low-speed boundary because a heavier wing needs more lift, and a warm day lowers the aircraft's capability because thrust falls. Then the operational half, which is what is being assessed. Optimum altitude is the level that gives the best fuel efficiency for the current weight and conditions, and it rises as fuel burns off, which is why step climbs exist and why requesting one is a normal part of a long cruise rather than an afterthought. Maximum altitude is the highest level the aircraft can hold with the required buffet margin at the current weight and temperature, and it is a limit, not a target — cruising at maximum altitude leaves you with no margin for a turn, a temperature shear or a gust. Say what you actually do: plan the step climbs on the flight plan, verify against the box as the weight comes down, stay meaningfully below maximum, and in turbulence descend and slow to the turbulence penetration speed rather than trying to hold the level. Close with the failure mode: a heavy aircraft climbed early into a warm layer will not hold its speed, and the recovery is a descent, not more thrust.
What fails this question
- — Describing the margin as a speed band only
- — Treating maximum altitude as a cruise target
- — Not knowing weight and temperature move it
- — No mention of step climbs
Follow-ups they ask next
- — How much bank at maximum altitude?
- — You cannot hold speed at your level. What do you do?
- — When would you request a step climb?
Question 5 of 100·technical
What is RNP, what does RNP-AR add, and what does an RNP value of 1.0 or 0.3 actually mean?
What they are really probing: The number is a containment, not an accuracy claim. Get that right and the rest follows.
Model answer
Start with the concept that separates RNP from RNAV: both specify a navigation accuracy, but RNP adds on-board performance monitoring and alerting — the aircraft must know whether it is meeting the required accuracy and must tell you when it is not. That alerting is the whole difference and it is what makes the tighter procedures possible. Then the number: an RNP value is a containment in nautical miles, and the requirement is that the aircraft remains within that distance of the intended track for ninety-five per cent of the flight time, with the total system error contained within twice that value at a very high probability. So RNP 1.0 means one nautical mile either side; RNP 0.3 means three tenths, which is a corridor of well under a mile in total — the sort of accuracy that lets a procedure be built through terrain. Then what AR adds: authorisation required, meaning the operator, the aircraft and the crew are each specifically approved, because the procedure may use values below 0.3, may require radius-to-fix curved legs, and may have obstacle clearance that depends on the aircraft staying inside the corridor with no reversion available. Say the consequence explicitly: on an AR procedure a loss of the required performance is a go-around, not a downgrade, and the missed approach may itself be RNP. Then the practical: know what invalidates the approach on your type, know that it generally cannot be flown raw data, and brief the loss case before you start. Close with the honest point — the accuracy comes from the system, and the discipline comes from you.
What fails this question
- — No mention of on-board monitoring and alerting
- — Describing the value as an accuracy rather than a containment
- — Thinking you can downgrade mid-approach on an AR procedure
- — Cannot expand 'AR'
Follow-ups they ask next
- — What is the 95% requirement?
- — How is RNP different from RNAV?
- — You lose the required RNP on final. Actions?
Same depth as the 5 above — model answer, red flags and follow-ups on every one. You just read a twentieth of the pack; if those five were not worth your time, the rest will not be either, and you should not buy it.
— What does flight envelope protection give you, and what changes when it is lost?
— What is a takeoff alternate, and when is one required?
— When do you turn ice protection on, and what does using it cost you?
— What's the difference between IAS, TAS, and groundspeed?
— Brief a decompression at FL400. What is the time of useful consciousness?
— Define a stable approach and list the gates. Who calls the go-around?
— What is asymmetric thrust and how do you trim for it?
— How do centralised alerting and electronic checklist systems differ between manufacturers?
— What makes ETOPS planning on a remote southern-hemisphere route different?
— What is TAWS, and how is it different from a basic ground proximity warning system?
Not affiliated with Qatar Airways. Process details are sourced and dated; candidate-reported detail is labelled as reported.