PPL Free Ground School

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Free FAA private-pilot ground school: source-cited answers, lessons and practice questions.

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check_answer Read-only

Grade the user's answer to a practice question from get_practice_question. Use this when the user replies with their choice (for example "B" or "I think it is C"): pass the question_id and their choice. Returns whether the answer is correct, the correct choice, why each choice is right or wrong, and the FAA citations. It also returns save_progress_url, a pplfree.com link where the user can save the answers from this chat to their study progress on that site, and save_token: pass it back as previous_token on the next check_answer call so one link collects every answer in the chat (up to 20, valid for 7 days). Nothing is stored unless the user opens the link.

choicestring, required

The choice the user picked: its label (e.g. "b" or "B").

question_idstring, required

The questionId returned by get_practice_question.

previous_tokenstring

The save_token from the previous check_answer call in this chat, if any, so the save link keeps every answer. Omit on the first answer.

Tools (5)

check_answer

read-only

Argument	Type	Description
choice*	string	The choice the user picked: its label (e.g. "b" or "B").
question_id*	string	The questionId returned by get_practice_question.
previous_token	string	The save_token from the previous check_answer call in this chat, if any, so the save link keeps every answer. Omit on the first answer.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "question_id",
    "choice"
  ],
  "properties": {
    "choice": {
      "type": "string",
      "maxLength": 20,
      "description": "The choice the user picked: its label (e.g. \"b\" or \"B\")."
    },
    "question_id": {
      "type": "string",
      "maxLength": 120,
      "description": "The questionId returned by get_practice_question."
    },
    "previous_token": {
      "type": "string",
      "maxLength": 4096,
      "description": "The save_token from the previous check_answer call in this chat, if any, so the save link keeps every answer. Omit on the first answer."
    }
  },
  "additionalProperties": false
}

get_lesson

Fetch one full ground-school lesson: its summary, why it matters in flight, the learning objectives it covers, and a link to read it. Use this after search_faa_knowledge when the user wants the whole topic rather than a single answer, or when they ask to study or learn a subject properly. Call list_curriculum first if you do not already have a lesson key.

read-only

Argument	Type	Description
lessonKey*	string	Lesson key, e.g. "as.lesson.vfr-minimums". From list_curriculum.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "lessonKey"
  ],
  "properties": {
    "lessonKey": {
      "type": "string",
      "maxLength": 120,
      "description": "Lesson key, e.g. \"as.lesson.vfr-minimums\". From list_curriculum."
    }
  },
  "additionalProperties": false
}

get_practice_question

Return private-pilot practice questions written for this course in the style of the FAA knowledge test (not actual FAA test questions), each with its answer choices, its topic, a question_id and a link to try it on pplfree.com. The correct answer is withheld by default so the user can attempt the question first. Once the user has answered, call check_answer with that question_id and their choice to grade it (or call this tool again with the question_id and reveal_answer: true to show the answer without grading). Use this when the user wants to be quizzed, asks for practice or test questions, wants to check their understanding of a topic, or is preparing for the FAA private-pilot knowledge test. Optionally scope it to a topic.

read-only

Argument	Type	Description
count	integer	How many questions to return (1-5, default 1).
topic	string	Optional topic to draw from, e.g. "airspace", "weather", "aerodynamics", "regulations", "navigation", "weight-balance", "systems". Omit for any topic.
question_id	string	A question_id from an earlier call, to return that exact question (typically with reveal_answer: true). Overrides topic and count.
reveal_answer	boolean	Include the correct choice and the explanation. Default false: leave it off until the user has attempted the question.

Input schema (JSON)

{
  "type": "object",
  "required": [],
  "properties": {
    "count": {
      "type": "integer",
      "maximum": 5,
      "minimum": 1,
      "description": "How many questions to return (1-5, default 1)."
    },
    "topic": {
      "type": "string",
      "maxLength": 80,
      "description": "Optional topic to draw from, e.g. \"airspace\", \"weather\", \"aerodynamics\", \"regulations\", \"navigation\", \"weight-balance\", \"systems\". Omit for any topic."
    },
    "question_id": {
      "type": "string",
      "maxLength": 120,
      "description": "A question_id from an earlier call, to return that exact question (typically with reveal_answer: true). Overrides topic and count."
    },
    "reveal_answer": {
      "type": "boolean",
      "default": false,
      "description": "Include the correct choice and the explanation. Default false: leave it off until the user has attempted the question."
    }
  },
  "additionalProperties": false
}

list_curriculum

List the ground-school curriculum: modules and the published lessons in each, with their keys. Use this to orient yourself before get_lesson, to answer "what does the course cover", or to help a user plan what to study next.

read-only

Argument	Type	Description
module	string	Optional module key to expand, e.g. "MOD-08". Omit for all modules.

Input schema (JSON)

{
  "type": "object",
  "required": [],
  "properties": {
    "module": {
      "type": "string",
      "maxLength": 40,
      "description": "Optional module key to expand, e.g. \"MOD-08\". Omit for all modules."
    }
  },
  "additionalProperties": false
}

search_faa_knowledge

Answer a US private-pilot (FAA) ground-school question from a source-cited curriculum. Use this whenever the user asks about FAA regulations, airspace, VFR weather minimums, weight and balance, aerodynamics, aircraft systems, navigation, weather theory, human factors, or private-pilot certification requirements. Returns short passages, each with the FAA citation it came from (e.g. "14 CFR 91.155", "PHAK Ch. 15") and a link to the lesson. Cite those labels in your answer.

read-only

Argument	Type	Description
limit	integer	How many passages to return (1-8, default 4).
query*	string	The user's question, in their own words.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "query"
  ],
  "properties": {
    "limit": {
      "type": "integer",
      "maximum": 8,
      "minimum": 1,
      "description": "How many passages to return (1-8, default 4)."
    },
    "query": {
      "type": "string",
      "maxLength": 500,
      "minLength": 3,
      "description": "The user's question, in their own words."
    }
  },
  "additionalProperties": false
}