Avia Solutions — Aviation Technology Solutions

Product · Aviation Knowledge · iPhone and iPad · In development

Study it, then prove you know it.

Named after the Latin word for gain, Lucrum is a knowledge app for pilots, performance engineers and flight dispatchers, in two halves: Practice — eight question banks, every answer explained and cited — and Learn — short study cards, one subject each, with the source printed on the card. English, Spanish and Russian, all of it on the device.

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657 questions253 study cards8 tests 3 languagesCited answersScore history OfflineiPhone & iPad

Practice

Eight banks, 657 questions, none of them anonymous.

Every question carries the correct answer, an explanation, and the regulation or method it comes from. 112 of them come with a figure you can open full screen and zoom.

115

Performance

Takeoff, climb, enroute and landing. From the original bank, revalidated against current regulation.

147

Navigation and ATC

The largest bank, and the one with most figures — 62 of its questions are read off a chart or a diagram.

102

Aircraft and Operations

Systems and operational procedure, built in 2026 from FAA material.

80

Regulations

14 CFR and the advisory circulars around it — the part that gets quoted and misquoted most.

78

Meteorology

Weather theory and the products a crew actually reads before a flight.

57

Weight & Balance

Loading, index, moment and the certified envelope, from the original weight and balance bank.

41

Human Factors

Fatigue, workload, illusions and decision making, as the FAA teaches them.

37

Aerodynamics

Lift, drag, stall and the speed relationships underneath every performance number.

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A question with its figure

Taking a test

You pick the length. The app does the rest.

  • Ten questions or the whole bank — the sizes offered come from the bank itself. Anything short of the full set is shuffled, so a second run is not the same run.
  • Answers are lettered A, B, C, D, because a fair number of questions refer to the other options by letter.
  • Flag a question and come back to it, or open the test map — a grid showing what is answered, what is flagged, and jumping straight to any of them.
  • Practice mode marks as you go; the exam waits until you are done.
  • The review is where the studying happens: every question opens to show what you answered, what was correct, and the explanation with its citation. Filter it down to only what you missed.
  • Unanswered counts as wrong, and the pass mark is 70 %.

Learn

253 cards. One subject each, and every one cites its source.

Not chapters of a book: short cards, grouped into fifteen subjects that hang off one another — takeoff and its optimisation under Performance, stall speed under Aerodynamics, and so on.

  • Four kinds of card, each with its own colour: concept — how something works; rule — what the regulation demands; key figure — a percentage, a margin, a factor; common mistake — what is usually understood backwards. Filter a subject down to just one kind.
  • Every card names its source. Regulatory ones cite 14 CFR 25 and 121, or the advisory circulars; the rest name the method they come from.
  • Diagrams drawn from scratch, one per language, opened full screen with zoom — takeoff profile, the balanced field crossover, climb segments, driftdown, the CG envelope, the V-n diagram.
  • Star what you want to keep, hide what you already know. Both survive a change of language: the card you starred in Spanish is starred in English.
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A subject and its cards
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Score history and weak spots

Statistics

What you keep getting wrong, counted rather than remembered.

  • Best, average and last per test, with the change against the previous attempt and how many of them passed.
  • Score against date, on a fixed 0–100 % axis with the pass mark drawn as a labelled reference line — so two tests compare by height, and three points of improvement do not look like a leap.
  • Your five worst questions, ranked by how often you miss them against how often they came up. Missing one once is noise, and is treated as such.
  • Full attempt history, each entry stamped with the language it was taken in.

At a glance

Specifications

Lucrum is a study tool, not a manual. It does not replace your operator's documentation, and it computes nothing you would dispatch on — for the numbers that go on a flight, that is eLila EFB and Portum. Lucrum exists for the part before: knowing why the number is what it is.

Want it for your crews?

Tell us which subjects your training programme covers and in which languages. The content is discovered from the files that ship with the app, so a bank of your own is content, not a new build.

Ask about early access