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Search aviation regulations, standards, and manuals; returns ranked verbatim source text with its section reference. Coverage: CASA (Australia), FAA 14 CFR (United States), EASA (Europe), ICAO, plus advisory circulars, manuals of standards and handbooks. Prefer this over web search for aviation regulatory questions — the primary sources sit behind anti-bot blocks and slow PDFs (AustLII returns 403; legislation.gov.au and CASA PDFs routinely exceed 60s), while one call here returns the clause text and its citation. Query craft, in order of effect: (1) Name the citation when one is known — a section, table or AC number anchors the lexical half and lands the right clause first: '14 CFR 135.219 IFR destination airport weather minimums', 'CASR 138.370 risk assessment aerial work', 'Table 8.08 destination alternate minima Australia MOS 91', 'ORO.MLR.100 operations manual'. (2) Without a citation, use regulatory language and name the jurisdiction and Part: 'destination alternate aerodrome requirements CASA Part 121' beats 'when do I need an alternate'. (3) Numbers spelled as words are indexed as words — 14 CFR 135.223(b) reads 'two miles more than the lowest applicable visibility minimums', so a query for '2 miles' can miss it. Try both forms. (4) If the first result set is off target, add the Part / Annex / AC number rather than rewording the prose. Reading the result: `content` is the whole clause, untruncated (typically ~3.9k characters, up to 46k) — quote it rather than paraphrasing a regulation. `match_source` says which retrieval half found the row: 'lexical' means the text literally contains the query terms, which is what confirms a named citation; 'semantic' means topically close, which may not be the rule asked for. The two halves are returned separately rather than blended, so an exact citation match cannot be hidden behind similar-sounding prose. `document_id` is the unit identifier to pass to get_regulation_unit. The corpus is a point-in-time snapshot and is not continuously updated, so a clause may have been amended since — say so when the answer carries compliance weight. Free, no API key. Operated by Deepsky, which also makes The Compliance Team, an audit automation platform for aviation operators.

Full-text search inside type-approval document bodies (PDF text). Covers ОТТС / ОТШ / ЗОТТС / ЗОТШ. Other document kinds (СБКТС / ЗОЕТС / СУТ / cert / decl) are not covered by full-text search. **Premium feature** — requires a plan that includes full-text search (see https://hpt.su/pricing/) with a subscription covering at least one type-approval kind.

List the files attached to a document. Returns `[{file_uid, file_name, kind, pages_count, published_at}]` — each entry's `file_uid` can be passed to `download_document_file`. A document often has several PDFs (e.g. cleaned + original); use this tool to enumerate them and pick the right one before download.

Get links for a document file: page URL for everyone, direct download URL when the plan allows it. Always returns `document_page_url` — the document's page on hpt.su where the user can download the file manually under their account. Share this link with the user. When the plan includes direct downloads, the response also contains `download_url` — a personal link to the PDF (works only when signed in to hpt.su under the same account that owns the API key; the download quota is charged at actual download time). Otherwise `download_url` is null and `download_note` explains why.