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ecfr-title-14

reference corpus · status live · domain LAW (Law and regulation) · lane A · refresh pinned · tags US · AVIATION · LAW · STANDARDS · FAA · AIRWORTHINESS

What an agent uses it for

a pilot or mechanic queries this for the current FAR text: visibility minimums, transponder airspace, inspection intervals, right-of-way

Use it
curl -fsSLO https://raw.githubusercontent.com/xerj-org/xerj/corpus-hub/tools/xerj-code/hub/ecfr-title-14.json
xerj corpus add --from ./ecfr-title-14.json
xerj corpus index ecfr-title-14 then xerj code ecfr-title-14 "your question"

Needs the xerj CLI and a local node running; the copy prompt covers both, checks each step, and shows how to stop only the node you started. No shell: the MCP tool xerj_code_search with corpus: "ecfr-title-14", once the corpus is indexed on the node.

Sources and pins

sourcepinlicencesizereview note
corpus-ecfr-title-14 0520b312d964US-government public domain (CFR text, 17 USC 105) 11.2 MB / 6,421 files eCFR Title 14 (Aeronautics and Space - FARs) snapshot, AMDDATE 2026-07-24, downloaded 2026-10-04 from GPO bulk API. Same per-section split and tooling as the live ecfr-title-12/26/29 mirrors (split_ecfr.py). G7 graded 2026-10-04: 5/5 pass 5/5 relevant (91.155 visibility, 91.215 transponder, 91.119 min safe altitude, 91.409 inspection interval, 91.113 right-of-way). Build note: first index on the s

11.2 MB across 6,421 files. Added 2026-10-04.

People behind this corpus

Upstream authors (1)

Owners of the pinned repositories, credited under each repository's licence. They have not signed up here; their pages are attribution.

xerj-org@xerj-org · upstream

All contributors.

Rights

US-government public domain (CFR text, 17 USC 105). Redistribution permitted with attribution per the licence review. The review block records a human opening each licence file at the pin. Detector output is a hint, never the verdict.

Retrieval spot-check (G7)

5.0/5 relevant. Graded .

Q: VFR minimum flight visibility and distance from clouds by airspace class
expect: parts/part-91/sec-91.155.txt
top-5: corpus-ecfr-title-14/parts/part-91/sec-91.155.txt / corpus-ecfr-title-14/parts/part-103/sec-103.23.txt / corpus-ecfr-title-14/parts/part-135/sec-135.613.txt / corpus-ecfr-title-14/parts/part-91/sec-91.129.txt / corpus-ecfr-title-14/parts/part-91/sec-91.155.txt
grade: pass
Q: when is an operable transponder with Mode C required to operate an aircraft
expect: parts/part-91/sec-91.215.txt
top-5: corpus-ecfr-title-14/parts/part-91/sec-91.215.txt / corpus-ecfr-title-14/parts/part-91/sec-91.215.txt / corpus-ecfr-title-14/parts/part-91/sec-91.217.txt / corpus-ecfr-title-14/parts/part-99/sec-99.13.txt / corpus-ecfr-title-14/parts/part-93/sec-93.339.txt
grade: pass
Q: minimum safe altitude flying over a congested city
expect: parts/part-91/sec-91.119.txt
top-5: corpus-ecfr-title-14/parts/part-91/sec-91.119.txt / corpus-ecfr-title-14/parts/part-103/sec-103.15.txt / corpus-ecfr-title-14/parts/part-137/sec-137.51.txt / corpus-ecfr-title-14/parts/part-105/sec-105.21.txt / corpus-ecfr-title-14/parts/part-91/sec-91.303.txt
grade: pass
Q: how often must an aircraft have an annual inspection to be operated
expect: parts/part-91/sec-91.409.txt
top-5: corpus-ecfr-title-14/parts/part-91/sec-91.409.txt / corpus-ecfr-title-14/parts/part-145/sec-145.211.txt / corpus-ecfr-title-14/parts/part-121/sec-121.629.txt / corpus-ecfr-title-14/parts/part-136/sec-136.1.txt / corpus-ecfr-title-14/parts/part-137/sec-137.53.txt
grade: pass
Q: which aircraft has the right of way when two aircraft are converging
expect: parts/part-91/sec-91.113.txt
top-5: corpus-ecfr-title-14/parts/part-91/sec-91.113.txt / corpus-ecfr-title-14/parts/part-91/sec-91.113.txt / corpus-ecfr-title-14/parts/part-91/sec-91.115.txt / corpus-ecfr-title-14/parts/part-93/sec-93.163.txt / corpus-ecfr-title-14/parts/part-107/sec-107.37.txt
grade: pass

Agent score

From structured reviews that AI agents send after they use this corpus: through xerj hub pull, MCP queries, or the xerj_corpus_feedback tool. Each review rates usefulness 1–5, whether the answer was found, and freshness. This is not the human hub star count shown above. The two are never mixed.

Loading agent reviews…

Score = Bayesian mean of usefulness (prior 3.0 with weight 5), so a few reviews cannot swing it. One voice per installation per corpus per week; abnormal-volume reviewers are dropped. Coverage gaps appear only once 3 or more agents report the same one. How it works.

Traffic

Traffic stats load from /api/hub-traffic when this page runs JavaScript.

Views: visits to this page (search-engine crawlers excluded). Unique: distinct visitors per day, by a hash salted with the day, so the 14-day unique figure adds up daily uniques. Pulls: growth of the GitHub release download count of this corpus’s pack (xerj hub pull downloads from there; includes our own pack-verification downloads). Searches: hosted-hub queries for this corpus. Referring sites appear after 3 views. What is collected.

Agent usage

Usage stats load from /api/hub-usage when this page runs JavaScript.

Counted: requests agents send to the hosted hub API (hub.xerj.org/api/v1/code, /def) for this corpus. Queries on your own node (xerj code, xerj ask with a local pack, the MCP tools) never leave your machine and are not counted. Templates replace identifiers, versions, paths, numbers and quoted text with placeholders; one is shown only once it has been seen 3 times in 30 days, and any word asked fewer than 3 times shows as <term>. Raw queries are never published. What is collected.