{"asset": "aircraft-inspection-and-test-intervals", "asset_type": "lifecycle", "body": "How often each required aircraft inspection, test or check must be done under Part 91, in the unit the regulation actually uses. Each record is one item with its interval, the anchor the interval runs from, and the consequence of letting it lapse. Covers the annual and 100-hour inspection (14 CFR 91.409), the altimeter and static pressure system test (91.411), the ATC transponder test (91.413), the emergency locator transmitter inspection and battery replacement (91.207), and the VOR equipment check for IFR (91.171). Answers 'does an ELT battery have to be replaced every year', 'how often does a transponder need to be checked', 'is the pitot static check 24 months', 'does a 100 hour inspection reset the annual', and 'how often do I need a VOR check for IFR'. Every one of these is expressed in a different unit - 12 calendar months, 100 hours, 24 calendar months, 30 days, 1 cumulative hour of transmitter use or 50 percent of useful life - which is why the neighbouring ones get swapped: the ELT 12-month item is the inspection, not the battery.\n", "description": "How often each required aircraft inspection, test or check must be done under Part 91, in the unit the regulation actually uses. Each record is one item with its interval, the anchor the interval runs from, and the consequence of letting it lapse. Covers the annual and 100-hour inspection (14 CFR 91.409), the altimeter and static pressure system test (91.411), the ATC transponder test (91.413), the emergency locator transmitter inspection and battery replacement (91.207), and the VOR equipment check for IFR (91.171). Answers 'does an ELT battery have to be replaced every year', 'how often does a transponder need to be checked', 'is the pitot static check 24 months', 'does a 100 hour inspection reset the annual', and 'how often do I need a VOR check for IFR'. Every one of these is expressed in a different unit - 12 calendar months, 100 hours, 24 calendar months, 30 days, 1 cumulative hour of transmitter use or 50 percent of useful life - which is why the neighbouring ones get swapped: the ELT 12-month item is the inspection, not the battery.", "file": "index.md", "generated": true, "harvested": "2026-08-06", "key_field": "item", "licence": "Facts extracted from the US Code of Federal Regulations, a US government work not subject to copyright. Records quote the official eCFR text via its versioner API (the eCFR HTML pages block our fetcher; law.cornell.edu copies were read as a cross-check but carry inline definition links that break verbatim quoting); each record quotes a short verbatim span and links back to the section.", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.409", "https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.411", "https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.413", "https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.207", "https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.171"], "stale_after": "2028-08-05", "title": "Aircraft inspection and test intervals under 14 CFR Part 91", "type": "dataset", "verified": false} {"applies_to": "aircraft carrying any person (other than a crewmember) for hire", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** 100-hour inspection\n\n**Interval:** within the preceding 100 hours of time in service\n\n**Applies to:** aircraft carrying any person (other than a crewmember) for hire\n\n**Consequence if lapsed:** no person may operate an aircraft carrying any person (other than a crewmember) for hire\n\n**Regulation section:** \u00a7 91.409\n\n> no person may operate an aircraft carrying any person (other than a crewmember) for hire, and no person may give flight instruction for hire in an aircraft which that person provides, unless within the preceding 100 hours of time in service the aircraft has received an annual or 100-hour inspection and been approved for return to service in accordance with part 43 of this chapter or has received an inspection for the issuance of an airworthiness certificate in accordance with part 21 of this chapter. The 100-hour limitation may be exceeded by not more than 10 hours while en route to reach a place where the inspection can be done.\n\nSource: \n", "citation": "\u00a7 91.409", "consequence": "no person may operate an aircraft carrying any person (other than a crewmember) for hire", "file": "100-hour-inspection.md", "generated": true, "harvested": "2026-08-06", "id": "100-hour-inspection", "interval": "within the preceding 100 hours of time in service", "item": "100-hour inspection", "source_quote": "no person may operate an aircraft carrying any person (other than a crewmember) for hire, and no person may give flight instruction for hire in an aircraft which that person provides, unless within the preceding 100 hours of time in service the aircraft has received an annual or 100-hour inspection and been approved for return to service in accordance with part 43 of this chapter or has received an inspection for the issuance of an airworthiness certificate in accordance with part 21 of this chapter. The 100-hour limitation may be exceeded by not more than 10 hours while en route to reach a place where the inspection can be done.", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.409"], "stale_after": "2028-08-05", "title": "100-hour inspection \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "airplane, or helicopter, in controlled airspace under IFR", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** Altimeter instrument\n\n**Interval:** Within the preceding 24 calendar months\n\n**Applies to:** airplane, or helicopter, in controlled airspace under IFR\n\n**Consequence if lapsed:** No person may operate an airplane, or helicopter, in controlled airspace under IFR\n\n**Regulation section:** \u00a7 91.411\n\n> No person may operate an airplane, or helicopter, in controlled airspace under IFR unless\u2014 (1) Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested and inspected and found to comply with appendices E and F of part 43 of this chapter;\n\nSource: \n", "citation": "\u00a7 91.411", "consequence": "No person may operate an airplane, or helicopter, in controlled airspace under IFR", "file": "altimeter-instrument.md", "generated": true, "harvested": "2026-08-06", "id": "altimeter-instrument", "interval": "Within the preceding 24 calendar months", "item": "Altimeter instrument", "source_quote": "No person may operate an airplane, or helicopter, in controlled airspace under IFR unless\u2014 (1) Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested and inspected and found to comply with appendices E and F of part 43 of this chapter;", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.411"], "stale_after": "2028-08-05", "title": "Altimeter instrument \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "aircraft", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** Annual inspection\n\n**Interval:** within the preceding 12 calendar months\n\n**Applies to:** aircraft\n\n**Consequence if lapsed:** no person may operate an aircraft\n\n**Regulation section:** \u00a7 91.409\n\n> no person may operate an aircraft unless, within the preceding 12 calendar months, it has had\u2014 (1) An annual inspection in accordance with part 43 of this chapter and has been approved for return to service by a person authorized by \u00a7 43.7 of this chapter\n\nSource: \n", "citation": "\u00a7 91.409", "consequence": "no person may operate an aircraft", "file": "annual-inspection.md", "generated": true, "harvested": "2026-08-06", "id": "annual-inspection", "interval": "within the preceding 12 calendar months", "item": "Annual inspection", "source_quote": "no person may operate an aircraft unless, within the preceding 12 calendar months, it has had\u2014 (1) An annual inspection in accordance with part 43 of this chapter and has been approved for return to service by a person authorized by \u00a7 43.7 of this chapter", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.409"], "stale_after": "2028-08-05", "title": "Annual inspection \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "ATC transponder that is specified in 91.215(a), 121.345(c), or \u00a7 135.143(c) of this chapter", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** ATC transponder\n\n**Interval:** within the preceding 24 calendar months\n\n**Applies to:** ATC transponder that is specified in 91.215(a), 121.345(c), or \u00a7 135.143(c) of this chapter\n\n**Consequence if lapsed:** No persons may use an ATC transponder\n\n**Regulation section:** \u00a7 91.413\n\n> No persons may use an ATC transponder that is specified in 91.215(a), 121.345(c), or \u00a7 135.143(c) of this chapter unless, within the preceding 24 calendar months, the ATC transponder has been tested and inspected and found to comply with appendix F of part 43 of this chapter; and\n\nSource: \n", "citation": "\u00a7 91.413", "consequence": "No persons may use an ATC transponder", "file": "atc-transponder.md", "generated": true, "harvested": "2026-08-06", "id": "atc-transponder", "interval": "within the preceding 24 calendar months", "item": "ATC transponder", "source_quote": "No persons may use an ATC transponder that is specified in 91.215(a), 121.345(c), or \u00a7 135.143(c) of this chapter unless, within the preceding 24 calendar months, the ATC transponder has been tested and inspected and found to comply with appendix F of part 43 of this chapter; and", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.413"], "stale_after": "2028-08-05", "title": "ATC transponder \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "airplane, or helicopter, in controlled airspace under IFR", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** Automatic pressure altitude reporting system\n\n**Interval:** Within the preceding 24 calendar months\n\n**Applies to:** airplane, or helicopter, in controlled airspace under IFR\n\n**Consequence if lapsed:** No person may operate an airplane, or helicopter, in controlled airspace under IFR\n\n**Regulation section:** \u00a7 91.411\n\n> No person may operate an airplane, or helicopter, in controlled airspace under IFR unless\u2014 (1) Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested and inspected and found to comply with appendices E and F of part 43 of this chapter;\n\nSource: \n", "citation": "\u00a7 91.411", "consequence": "No person may operate an airplane, or helicopter, in controlled airspace under IFR", "file": "automatic-pressure-altitude-reporting-system.md", "generated": true, "harvested": "2026-08-06", "id": "automatic-pressure-altitude-reporting-system", "interval": "Within the preceding 24 calendar months", "item": "Automatic pressure altitude reporting system", "source_quote": "No person may operate an airplane, or helicopter, in controlled airspace under IFR unless\u2014 (1) Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested and inspected and found to comply with appendices E and F of part 43 of this chapter;", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.411"], "stale_after": "2028-08-05", "title": "Automatic pressure altitude reporting system \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "emergency locator transmitters required by paragraphs (a) and (b) of this section", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** Batteries used in the emergency locator transmitters\n\n**Interval:** When the transmitter has been in use for more than 1 cumulative hour; or (2) When 50 percent of their useful life (or, for rechargeable batteries, 50 percent of their useful life of charge) has expired\n\n**Applies to:** emergency locator transmitters required by paragraphs (a) and (b) of this section\n\n**Consequence if lapsed:** must be replaced (or recharged, if the batteries are rechargeable)\n\n**Regulation section:** \u00a7 91.207\n\n> Batteries used in the emergency locator transmitters required by paragraphs (a) and (b) of this section must be replaced (or recharged, if the batteries are rechargeable)\u2014 (1) When the transmitter has been in use for more than 1 cumulative hour; or (2) When 50 percent of their useful life (or, for rechargeable batteries, 50 percent of their useful life of charge) has expired, as established by the transmitter manufacturer under its approval.\n\nSource: \n", "citation": "\u00a7 91.207", "consequence": "must be replaced (or recharged, if the batteries are rechargeable)", "file": "batteries-used-in-the-emergency-locator-transmitters.md", "generated": true, "harvested": "2026-08-06", "id": "batteries-used-in-the-emergency-locator-transmitters", "interval": "When the transmitter has been in use for more than 1 cumulative hour; or (2) When 50 percent of their useful life (or, for rechargeable batteries, 50 percent of their useful life of charge) has expired", "item": "Batteries used in the emergency locator transmitters", "source_quote": "Batteries used in the emergency locator transmitters required by paragraphs (a) and (b) of this section must be replaced (or recharged, if the batteries are rechargeable)\u2014 (1) When the transmitter has been in use for more than 1 cumulative hour; or (2) When 50 percent of their useful life (or, for rechargeable batteries, 50 percent of their useful life of charge) has expired, as established by the transmitter manufacturer under its approval.", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.207"], "stale_after": "2028-08-05", "title": "Batteries used in the emergency locator transmitters \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "Each emergency locator transmitter required by paragraph (a) of this section", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** Emergency locator transmitter\n\n**Interval:** within 12 calendar months after the last inspection\n\n**Applies to:** Each emergency locator transmitter required by paragraph (a) of this section\n\n**Consequence if lapsed:** must be inspected within 12 calendar months after the last inspection\n\n**Regulation section:** \u00a7 91.207\n\n> Each emergency locator transmitter required by paragraph (a) of this section must be inspected within 12 calendar months after the last inspection for\u2014 (1) Proper installation; (2) Battery corrosion; (3) Operation of the controls and crash sensor; and (4) The presence of a sufficient signal radiated from its antenna.\n\nSource: \n", "citation": "\u00a7 91.207", "consequence": "must be inspected within 12 calendar months after the last inspection", "file": "emergency-locator-transmitter.md", "generated": true, "harvested": "2026-08-06", "id": "emergency-locator-transmitter", "interval": "within 12 calendar months after the last inspection", "item": "Emergency locator transmitter", "source_quote": "Each emergency locator transmitter required by paragraph (a) of this section must be inspected within 12 calendar months after the last inspection for\u2014 (1) Proper installation; (2) Battery corrosion; (3) Operation of the controls and crash sensor; and (4) The presence of a sufficient signal radiated from its antenna.", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.207"], "stale_after": "2028-08-05", "title": "Emergency locator transmitter \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "ATC transponder where data correspondence error could be introduced", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** Installation or maintenance on an ATC transponder\n\n**Interval:** Following any installation or maintenance on an ATC transponder where data correspondence error could be introduced\n\n**Applies to:** ATC transponder where data correspondence error could be introduced\n\n**Consequence if lapsed:** No persons may use an ATC transponder\n\n**Regulation section:** \u00a7 91.413\n\n> No persons may use an ATC transponder that is specified in 91.215(a), 121.345(c), or \u00a7 135.143(c) of this chapter unless, within the preceding 24 calendar months, the ATC transponder has been tested and inspected and found to comply with appendix F of part 43 of this chapter; and (b) Following any installation or maintenance on an ATC transponder where data correspondence error could be introduced, the integrated system has been tested, inspected, and found to comply with paragraph (c), appendix E, of part 43 of this chapter.\n\nSource: \n", "citation": "\u00a7 91.413", "consequence": "No persons may use an ATC transponder", "file": "installation-or-maintenance-on-an-atc-transponder.md", "generated": true, "harvested": "2026-08-06", "id": "installation-or-maintenance-on-an-atc-transponder", "interval": "Following any installation or maintenance on an ATC transponder where data correspondence error could be introduced", "item": "Installation or maintenance on an ATC transponder", "source_quote": "No persons may use an ATC transponder that is specified in 91.215(a), 121.345(c), or \u00a7 135.143(c) of this chapter unless, within the preceding 24 calendar months, the ATC transponder has been tested and inspected and found to comply with appendix F of part 43 of this chapter; and (b) Following any installation or maintenance on an ATC transponder where data correspondence error could be introduced, the integrated system has been tested, inspected, and found to comply with paragraph (c), appendix E, of part 43 of this chapter.", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.413"], "stale_after": "2028-08-05", "title": "Installation or maintenance on an ATC transponder \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "airplane, or helicopter, in controlled airspace under IFR", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** Installation or maintenance on the automatic pressure altitude reporting system of the ATC transponder\n\n**Interval:** Following installation or maintenance on the automatic pressure altitude reporting system of the ATC transponder\n\n**Applies to:** airplane, or helicopter, in controlled airspace under IFR\n\n**Consequence if lapsed:** No person may operate an airplane, or helicopter, in controlled airspace under IFR\n\n**Regulation section:** \u00a7 91.411\n\n> No person may operate an airplane, or helicopter, in controlled airspace under IFR unless\u2014 (1) Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested and inspected and found to comply with appendices E and F of part 43 of this chapter; (2) Except for the use of system drain and alternate static pressure valves, following any opening and closing of the static pressure system, that system has been tested and inspected and found to comply with paragraph (a), appendix E, of part 43 of this chapter; and (3) Following installation or maintenance on the automatic pressure altitude reporting system of the ATC transponder where data correspondence error could be introduced, the integrated system has been tested, inspected, and found to comply with paragraph (c), appendix E, of part 43 of this chapter.\n\nSource: \n", "citation": "\u00a7 91.411", "consequence": "No person may operate an airplane, or helicopter, in controlled airspace under IFR", "file": "installation-or-maintenance-on-the-automatic-pressure-altitude-reporting-system-.md", "generated": true, "harvested": "2026-08-06", "id": "installation-or-maintenance-on-the-automatic-pressure-altitude-reporting-system-", "interval": "Following installation or maintenance on the automatic pressure altitude reporting system of the ATC transponder", "item": "Installation or maintenance on the automatic pressure altitude reporting system of the ATC transponder", "source_quote": "No person may operate an airplane, or helicopter, in controlled airspace under IFR unless\u2014 (1) Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested and inspected and found to comply with appendices E and F of part 43 of this chapter; (2) Except for the use of system drain and alternate static pressure valves, following any opening and closing of the static pressure system, that system has been tested and inspected and found to comply with paragraph (a), appendix E, of part 43 of this chapter; and (3) Following installation or maintenance on the automatic pressure altitude reporting system of the ATC transponder where data correspondence error could be introduced, the integrated system has been tested, inspected, and found to comply with paragraph (c), appendix E, of part 43 of this chapter.", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.411"], "stale_after": "2028-08-05", "title": "Installation or maintenance on the automatic pressure altitude reporting system of the ATC transponder \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "airplane, or helicopter, in controlled airspace under IFR", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** Opening and closing of the static pressure system\n\n**Interval:** following any opening and closing of the static pressure system\n\n**Applies to:** airplane, or helicopter, in controlled airspace under IFR\n\n**Consequence if lapsed:** No person may operate an airplane, or helicopter, in controlled airspace under IFR\n\n**Regulation section:** \u00a7 91.411\n\n> No person may operate an airplane, or helicopter, in controlled airspace under IFR unless\u2014 (1) Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested and inspected and found to comply with appendices E and F of part 43 of this chapter; (2) Except for the use of system drain and alternate static pressure valves, following any opening and closing of the static pressure system, that system has been tested and inspected and found to comply with paragraph (a), appendix E, of part 43 of this chapter; and\n\nSource: \n", "citation": "\u00a7 91.411", "consequence": "No person may operate an airplane, or helicopter, in controlled airspace under IFR", "file": "opening-and-closing-of-the-static-pressure-system.md", "generated": true, "harvested": "2026-08-06", "id": "opening-and-closing-of-the-static-pressure-system", "interval": "following any opening and closing of the static pressure system", "item": "Opening and closing of the static pressure system", "source_quote": "No person may operate an airplane, or helicopter, in controlled airspace under IFR unless\u2014 (1) Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested and inspected and found to comply with appendices E and F of part 43 of this chapter; (2) Except for the use of system drain and alternate static pressure valves, following any opening and closing of the static pressure system, that system has been tested and inspected and found to comply with paragraph (a), appendix E, of part 43 of this chapter; and", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.411"], "stale_after": "2028-08-05", "title": "Opening and closing of the static pressure system \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "aircraft", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** Progressive inspection\n\n**Interval:** within each 12 calendar months\n\n**Applies to:** aircraft\n\n**Regulation section:** \u00a7 91.409\n\n> The frequency and detail of the progressive inspection shall provide for the complete inspection of the aircraft within each 12 calendar months and be consistent with the manufacturer's recommendations, field service experience, and the kind of operation in which the aircraft is engaged.\n\nSource: \n", "citation": "\u00a7 91.409", "file": "progressive-inspection.md", "generated": true, "harvested": "2026-08-06", "id": "progressive-inspection", "interval": "within each 12 calendar months", "item": "Progressive inspection", "source_quote": "The frequency and detail of the progressive inspection shall provide for the complete inspection of the aircraft within each 12 calendar months and be consistent with the manufacturer's recommendations, field service experience, and the kind of operation in which the aircraft is engaged.", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.409"], "stale_after": "2028-08-05", "title": "Progressive inspection \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "airplane, or helicopter, in controlled airspace under IFR", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** Static pressure system\n\n**Interval:** Within the preceding 24 calendar months\n\n**Applies to:** airplane, or helicopter, in controlled airspace under IFR\n\n**Consequence if lapsed:** No person may operate an airplane, or helicopter, in controlled airspace under IFR\n\n**Regulation section:** \u00a7 91.411\n\n> No person may operate an airplane, or helicopter, in controlled airspace under IFR unless\u2014 (1) Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested and inspected and found to comply with appendices E and F of part 43 of this chapter;\n\nSource: \n", "citation": "\u00a7 91.411", "consequence": "No person may operate an airplane, or helicopter, in controlled airspace under IFR", "file": "static-pressure-system.md", "generated": true, "harvested": "2026-08-06", "id": "static-pressure-system", "interval": "Within the preceding 24 calendar months", "item": "Static pressure system", "source_quote": "No person may operate an airplane, or helicopter, in controlled airspace under IFR unless\u2014 (1) Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested and inspected and found to comply with appendices E and F of part 43 of this chapter;", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.411"], "stale_after": "2028-08-05", "title": "Static pressure system \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true} {"applies_to": "civil aircraft under IFR using the VOR system of radio navigation", "asset": "aircraft-inspection-and-test-intervals", "body": "**Inspection or test item:** VOR equipment\n\n**Interval:** within the preceding 30 days\n\n**Applies to:** civil aircraft under IFR using the VOR system of radio navigation\n\n**Consequence if lapsed:** No person may operate a civil aircraft under IFR\n\n**Regulation section:** \u00a7 91.171\n\n> No person may operate a civil aircraft under IFR using the VOR system of radio navigation unless the VOR equipment of that aircraft\u2014 (1) Is maintained, checked, and inspected under an approved procedure; or (2) Has been operationally checked within the preceding 30 days, and was found to be within the limits of the permissible indicated bearing error set forth in paragraph (b) or (c) of this section.\n\nSource: \n", "citation": "\u00a7 91.171", "consequence": "No person may operate a civil aircraft under IFR", "file": "vor-equipment.md", "generated": true, "harvested": "2026-08-06", "id": "vor-equipment", "interval": "within the preceding 30 days", "item": "VOR equipment", "source_quote": "No person may operate a civil aircraft under IFR using the VOR system of radio navigation unless the VOR equipment of that aircraft\u2014 (1) Is maintained, checked, and inspected under an approved procedure; or (2) Has been operationally checked within the preceding 30 days, and was found to be within the limits of the permissible indicated bearing error set forth in paragraph (b) or (c) of this section.", "sources": ["https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91§ion=91.171"], "stale_after": "2028-08-05", "title": "VOR equipment \u2014 Aircraft inspection and test intervals under 14 CFR Part 91", "type": "lifecycle", "verified": true}