Definition
The phase exists because licences are gated on **experience** as well as on instruction. A candidate can complete every required lesson and still lack the total time, pilot-in-command time or cross-country hours the licence demands. Hour building fills that gap.
The European modular route makes it explicit. A candidate holding a PPL and working towards a CPL under Part-FCL must reach a defined total flight time, with sub-requirements including pilot-in-command time and cross-country experience with specified distance and landing conditions, before the CPL course and skill test. The gap between where a new PPL holder sits and where the CPL prerequisites begin is the hour-building phase, and it can run to a hundred hours or more.
The integrated route absorbs the same requirement into a continuous approved course, which is one of the real differences between the two paths rather than a presentational one.
In the FAA system the concept exists but the vocabulary rarely does. The aeronautical experience requirements of 14 CFR 61.129 do the same job for a commercial certificate, and pilots working towards airline minimums under the ATP requirements build time much as European pilots do — typically by instructing, towing, or flying traffic and survey work. **Time building** is the more usual American phrase, and instructing is the more usual American method, because the FAA route lets a commercial pilot earn while accumulating.
The quality question is what separates a useful phase from an expensive one. Hours flown as straight-and-level repetition satisfy the requirement and teach nothing; the same hours flown as genuine cross-country planning into unfamiliar aerodromes, in varied weather and airspace, build the judgement the next licence assumes. The regulation counts both identically. The candidate's logbook will not distinguish them, but an airline interview and the next instructor usually can.
A related distinction matters for logging: not all of the time counts the same way. Pilot-in-command time, dual time and time logged as PICUS are separate columns with separate uses, and a candidate who accumulates the right total in the wrong column can still miss a prerequisite. Reading the requirement before the flying, rather than after, is what avoids discovering that at the end.
The practical constraint is cost. Hour building is normally the cheapest per-hour flying in a pilot's progression — no instructor, the simplest available aircraft — which is why sharing costs with another pilot, flying club rates and self-fly hire dominate it, and why it is price-sensitive in a way instructional flying is not.
Why It Matters for Flight Schools
For a school or club, hour builders are a distinct customer with distinct economics. They are price-sensitive, need no instructor, book the simplest aircraft, and often want longer slots and away-landings that a booking policy written around one-hour training details handles badly.
They are also useful. Hour builders fill weekday and off-peak capacity that training demand does not reach, and they improve utilisation on exactly the tails whose fixed cost is hardest to spread. A school that treats them as second-class bookings is declining the cheapest utilisation available to it.
The risk is supervision. A low-experience pilot flying long cross-countries without oversight is a genuine exposure, and the schools that handle this well set clear self-dispatch criteria and weather limits rather than relying on the individual's judgement alone.
How Aviatize Handles This
Aviatize records flight time against the licence-relevant columns as it is flown, so a pilot's accumulating totals come from the same record the booking and the invoice do rather than being reconciled against a paper logbook afterwards. Pilots see their own record through the mobile app.
For the school, the validation engine governs what an hour-building booking must satisfy before it is confirmed — endorsements and checkout on type, currency and recency, required documents, and balance or account conditions — with each check set to warn or to block according to the school's own policy. That is how a club sets self-dispatch criteria as rules rather than as an expectation. Because these bookings bill from the recorded time on the same rate structure as everything else, the utilisation they add shows up per aircraft alongside training hours.
Frequently Asked Questions
- What is hour building?
- Flying undertaken mainly to accumulate the total time an onward licence, rating or airline application requires, rather than to learn a new skill. In the European modular route it is the phase between holding a PPL and meeting the experience prerequisites for the CPL course, and it can run to a hundred hours or more.
- Is hour building an FAA term?
- The concept applies but the phrase is mostly European. American pilots more often say time building, and the aeronautical experience requirements of 14 CFR 61.129 and the ATP minimums do the same work. The usual American method is instructing, because the FAA route lets a commercial pilot earn while accumulating rather than paying for the hours.
- Do integrated courses include hour building?
- They absorb it. An integrated course is a continuous approved programme that includes the experience requirements within it, rather than leaving a separate self-funded phase between licences. That structural difference is one of the genuine distinctions between the modular and integrated routes.
- Are all hour-building hours equally valuable?
- Not for the pilot, though the regulation counts them identically. Hours flown as straight-and-level repetition meet the requirement and teach little; the same hours flown as real cross-country planning into unfamiliar aerodromes, in varied weather and airspace, build the judgement the next licence assumes. A logbook cannot tell them apart, but an interviewer or the next instructor usually can.