Regulatory source: part-117-25-rest-period.html (current as of Feb 27, 2026)
Documents verified: definitions.html · calculator-us.html · duty-period-us.html
| Term | Status | Notes |
|---|---|---|
| Flight Duty Period (FDP) | ✅ Accurate | Text matches §117.3 verbatim (minor formatting difference: extra space in "airport/ standby reserve" — cosmetic only) |
| Theater | ✅ Accurate | Matches §117.3: "no more than 60 degrees longitude" |
| Acclimated | ✅ Accurate | Matches §117.3: "72 hours in theater OR 36 consecutive hours free from duty" |
| Short-call Reserve | ✅ Substantially accurate | Correctly describes RAP assignment without prior rest period; slightly simplified vs. §117.3 |
| Long-call Reserve | ✅ Accurate | States "at least 10 hours' notice" — matches §117.3 requirement to notify before §117.25 rest period |
Doc: "Extended" means a pre or post takeoff extension of a FDP.
Issue: §117.3 does not define "Extended" or "Extension" as a standalone term. Part 117 covers FDP extensions under §117.19 (Extensions due to unforeseen operational circumstances). The current definition is a simplified paraphrase not drawn from §117.3 and could be misleading ("pre-takeoff extension" is not Part 117 language). Needs a regulatory citation or should be flagged as an app-specific term.
Doc: "Rest Availability Period (RAP)" is a duty period during which a certificate holder requires a reserve flightcrew member on short call reserve to be available to receive an assignment for a FDP.
Issues: (1) §117.3 does not define "RAP" — the regulation uses "reserve availability period" as part of the Short-call reserve definition. "RAP" is an app-specific abbreviation and should be clearly labeled. (2) Calling RAP "a duty period" is technically incorrect — it is a reserve availability period, not an FDP.
Issue: §117.3 does not define "Rest Opportunity." It is used in §117.15 (Split duty). This is app-specific shorthand and should be labeled as such.
Doc: "Un-Augmented" used to label a three or four person flight crew.
Issue: A three or four person flight crew is an Augmented operation (Part 117 Table C). The doc uses "Un-Augmented" for 2-person crew AND for 3/4-person crew — both labeled "Un-Augmented." This is a critical documentation error that could cause Table lookup selection errors in implementation.
| Missing Term | Why It Matters |
|---|---|
| Deadhead transportation | Directly affects FDP calculations (§117.25(g), Table B — deadhead NOT a flight segment) |
| Duty | Foundational for rest calculations — deadhead IS duty, not rest |
| Fatigue | Background context for the regulation's purpose |
| Home base | Required for §117.25(d) 56-hr rest calculation |
| Physiological night's rest | Required for §117.25(d) three-physiological-nights requirement (10h encompassing 0100–0700) |
| Rest period | Foundational for all rest calculations |
| Reserve flightcrew member | Foundational for reserve operations |
| Unforeseen operational circumstance | Relevant to FDP extensions under §117.19 |
| Window of circadian low (WOCL) | Referenced in §117.17 and important for extension restrictions (0200–0559) |
| Rest facility classes 1, 2, 3 | Required for Table C augmented FDP lookup |
| Section | Subject | Status |
|---|---|---|
| §117.5 | Fitness for duty — self-assessment, unfit notification | ❌ Absent |
| §117.7 | Fatigue risk management system (FRMS) | ❌ Absent |
| §117.9 | Fatigue education and awareness training | ❌ Absent |
| §117.11 | Flight time limits (FTL) | ⚠️ Partial (Table A in Calculator_US but no standalone doc) |
| §117.13 | Cumulative flight time limits | ⚠️ Partial (numerically covered in Calculator_US) |
| §117.15 | Split duty rules | ⚠️ Partial (mentioned as note; no requirements doc) |
| §117.17 | Augmented operations rules | ⚠️ Partial (Table C referenced; no dedicated coverage) |
| §117.19 | Extensions of FDP (unforeseen operational circumstances) | ❌ Entirely absent — no extension rules, caps, or procedures |
| §117.21 | Reserve requirements (airport standby, long-call, short-call) | ⚠️ Partial (Definitions.md only; no requirements doc) |
| §117.23 | Cumulative limitations | ⚠️ Partial (numerically covered in Calculator_US) |
| §117.25 | Rest period requirements | ❌ Entirely absent — 0 of 7 subsections documented |
| §117.27 | Certificate holder responsibilities | ❌ Absent |
| §117.29 | Applicability (121 carriers) | ❌ Absent |
Notably missing — §117.19 FDP Extensions: Calculator_US.md and DutyPeriod_US.md include "Extended" as an FDP type, but document no extension conditions, no cap (max +2h for unaugmented beyond Table B), no WOCL restrictions, and no notification/recording requirements.
§117.25 has seven subsections (a)–(g). Coverage before this audit:
| Subsection | Requirement | Pre-Audit Coverage |
|---|---|---|
| §117.25(a) | No assignment during required rest period | ❌ Not documented |
| §117.25(b) | 30 consecutive hours free from duty within past 168 hours | ❌ Not documented |
| §117.25(c) | 36-hr rest in new theater = acclimated + meets (b) | ❌ Not documented |
| §117.25(d) | 56-hr rest at home base after trans-theater travel (>60° long, >168h away) + 3 physiological nights | ❌ Not documented |
| §117.25(e) | 10-hr pre-FDP rest (minimum 8 hrs sleep opportunity) | ❌ Not documented |
| §117.25(f) | FCM must notify if 8-hr sleep opportunity cannot be achieved | ❌ Not documented |
| §117.25(g) | Deadhead exceeding Table B FDP → rest ≥ deadhead duration, min 10 hrs | ❌ Not documented |
Summary: §117.25 was entirely absent from the documentation. All seven subsections were missing.
Calculator_US.md uses  but does not reproduce the values in text. Not a values error but cannot be verified without the image.
Status: "Table B reference image is not currently available in this repository."
This is a critical gap. Table B is the primary FDP lookup table for unaugmented lineholders. See part-117-25-rest-period.html for the complete table.
Doc states: "For a three-pilot crew, it is 13 hours; for a four-pilot crew, it is 17 hours."
Reality: Table C FDP limits depend on both crew count AND rest facility class and vary by time of start. The values "13h" and "17h" are the minimum corner cases only (Class 3 / 3 pilots at 0000–0559 = 13h; Class 1 / 4 pilots at 0700–1259 = 19h). Presenting them as flat limits is a material misrepresentation that could cause incorrect calculations. Correct range: 13–19 hrs across all configurations.
Calculator_US.md states the Maximum FDP is reduced by 30 minutes if the crew member is not acclimated. This cannot be verified from §117.25 alone — may be in §117.21 or FAA guidance. Needs a specific regulatory citation.
| # | File | Discrepancy | Severity |
|---|---|---|---|
| D-01 | Definitions | "Un-Augmented" incorrectly used for 3/4-person crew (should be "Augmented") | 🔴 Critical |
| D-02 | Calculator_US | Augmented FTL stated as flat "13h / 17h" — omits rest facility class entirely | 🔴 Critical |
| D-03 | Calculator_US | Table B absent ("not currently available") | 🔴 Critical |
| D-04 | Calculator_US | Table C absent ("not currently available") | 🔴 Critical |
| D-05 | Definitions | "Extension" definition not grounded in §117.3 (not an FAA-defined term) | 🟡 Moderate |
| D-06 | Definitions | RAP described as "a duty period" — incorrect framing | 🟡 Moderate |
| D-07 | All docs | §117.25 rest requirements entirely absent (0 of 7 subsections) | 🔴 Critical |
| D-08 | All docs | §117.19 FDP extension rules entirely absent despite "Extended FDP" being a tracked field | 🔴 Critical |
| D-09 | Definitions | 10 key §117.3 terms absent (deadhead, duty, home base, WOCL, rest facility classes, etc.) | 🟡 Moderate |
| D-10 | Calculator_US | 30-min non-acclimated FDP reduction lacks regulatory citation | 🟡 Moderate |
| D-11 | DutyPeriod_US | Uses "PDF" (likely typo for FDP) in three places | 🟢 Minor |
| D-12 | Definitions | RAP and RO defined as if they are §117.3 terms — they are app-specific | 🟢 Minor |
| D-13 | Calculator_US | Split duty RO rules stated (22:00–05:00, 3-hr minimum) without regulatory citation | 🟡 Moderate |
"Before beginning any reserve or flight duty period a flightcrew member must be given at least 30 consecutive hours free from all duty within the past 168 consecutive hour period."
"A flightcrew member must be given a minimum of 56 consecutive hours rest upon return to home base if the flightcrew member: (1) Travels more than 60° longitude during a flight duty period or a series of flight duty periods, and (2) is away from home base for more than 168 consecutive hours. The 56 hours of rest must encompass three physiological nights' rest based on local time."
"No certificate holder may schedule and no flightcrew member may accept an assignment for any reserve or flight duty period unless the flightcrew member is given a rest period of at least 10 consecutive hours immediately before beginning the reserve or flight duty period measured from the time the flightcrew member is released from duty. The 10 hour rest period must provide the flightcrew member with a minimum of 8 uninterrupted hours of sleep opportunity."
"If a flightcrew member engaged in deadhead transportation exceeds the applicable flight duty period in Table B of this part, the flightcrew member must be given a rest period equal to the length of the deadhead transportation but not less than the required rest in paragraph (e) of this section before beginning a flight duty period."
Report generated by ALPA Bot subagent (verify-usa-docs) — 2026-03-03