# PPL Free Ground School — pplfree.com

> A genuinely free, adaptive FAA Private Pilot (Airplane) ground school. The complete course is
> free forever — no credit card, no trial, no subscription. Optional one-time add-ons: a $99
> course-completion certificate and $99 for unlimited AI-instructor questions (first 3 free).

## What it is
- Prepares for the FAA Private Pilot — Airplane knowledge (written) test.
- 22 modules, 88 lessons, 214 tracked learning objectives — all publicly readable without an account.
- 477 original explained practice questions (872 total practice items in the graded bank) and unlimited mock exams in the real FAA format (60 questions, 2h30, graded server-side).
- Adaptive Bayesian mastery tracking with spaced review; completion means measured mastery, not videos watched.
- A retrieval-grounded AI instructor that answers only from approved study material and cites FAA sources (PHAK, AFH, AIM, 14 CFR, ACS, and more).
- Content is reviewed through an AI instructional-review system (AI_CFI) — an AI review, not a certificated flight instructor, and not FAA-approved.

## What it is NOT
- Not affiliated with or approved by the FAA.
- The optional certificate is a course-completion record, NOT an FAA pilot certificate, rating, or endorsement.
- It does not issue the CFI knowledge-test endorsement required to sit the FAA exam (a mock-endorsement PRACTICE document exists; a CFI/AGI must issue the real one).

## Key pages
- [Curriculum](https://pplfree.com/learn): all modules and lessons, free
- [Practice questions](https://pplfree.com/practice): full graded bank, no login required
- [Explained questions](https://pplfree.com/questions): every original question with answer + FAA source
- [Glossary](https://pplfree.com/glossary): 248 key terms defined
- [FAA test figures](https://pplfree.com/figures): the official public-domain testing-supplement figures
- [FAA reference library](https://pplfree.com/resources): PHAK, ACS, FAR, AIM deep links
- [How it works](https://pplfree.com/how-it-works)
- [FAQ](https://pplfree.com/faq)
- [Pricing / why free](https://pplfree.com/pricing)
- [Safety & accuracy](https://pplfree.com/safety-and-accuracy): sources and review methodology
- [AI instructor](https://pplfree.com/tutor)