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aircraft-inspection-and-test-intervals

applies_to string	citation string	consequence string	id string	interval string	item string	source string	source_quote string	url string	verified_fields list
aircraft carrying any person (other than a crewmember) for hire	§ 91.409	no person may operate an aircraft carrying any person (other than a crewmember) for hire	100-hour-inspection	within the preceding 100 hours of time in service	100-hour inspection	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.409	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 fo...	https://referencesource.org/aircraft-inspection-and-test-intervals/100-hour-inspection/	[ "applies_to", "citation", "consequence", "interval", "item" ]
airplane, or helicopter, in controlled airspace under IFR	§ 91.411	No person may operate an airplane, or helicopter, in controlled airspace under IFR	altimeter-instrument	Within the preceding 24 calendar months	Altimeter instrument	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.411	No person may operate an airplane, or helicopter, in controlled airspace under IFR unless— (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 ...	https://referencesource.org/aircraft-inspection-and-test-intervals/altimeter-instrument/	[ "applies_to", "citation", "consequence", "interval", "item" ]
aircraft	§ 91.409	no person may operate an aircraft	annual-inspection	within the preceding 12 calendar months	Annual inspection	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.409	no person may operate an aircraft unless, within the preceding 12 calendar months, it has had— (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 § 43.7 of this chapter	https://referencesource.org/aircraft-inspection-and-test-intervals/annual-inspection/	[ "applies_to", "citation", "consequence", "interval", "item" ]
ATC transponder that is specified in 91.215(a), 121.345(c), or § 135.143(c) of this chapter	§ 91.413	No persons may use an ATC transponder	atc-transponder	within the preceding 24 calendar months	ATC transponder	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.413	No persons may use an ATC transponder that is specified in 91.215(a), 121.345(c), or § 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	https://referencesource.org/aircraft-inspection-and-test-intervals/atc-transponder/	[ "applies_to", "citation", "consequence", "interval", "item" ]
airplane, or helicopter, in controlled airspace under IFR	§ 91.411	No person may operate an airplane, or helicopter, in controlled airspace under IFR	automatic-pressure-altitude-reporting-system	Within the preceding 24 calendar months	Automatic pressure altitude reporting system	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.411	No person may operate an airplane, or helicopter, in controlled airspace under IFR unless— (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 ...	https://referencesource.org/aircraft-inspection-and-test-intervals/automatic-pressure-altitude-reporting-system/	[ "applies_to", "citation", "consequence", "interval", "item" ]
emergency locator transmitters required by paragraphs (a) and (b) of this section	§ 91.207	must be replaced (or recharged, if the batteries are rechargeable)	batteries-used-in-the-emergency-locator-transmitters	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	Batteries used in the emergency locator transmitters	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.207	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)— (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 batterie...	https://referencesource.org/aircraft-inspection-and-test-intervals/batteries-used-in-the-emergency-locator-transmitters/	[ "applies_to", "citation", "consequence", "interval", "item" ]
Each emergency locator transmitter required by paragraph (a) of this section	§ 91.207	must be inspected within 12 calendar months after the last inspection	emergency-locator-transmitter	within 12 calendar months after the last inspection	Emergency locator transmitter	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.207	Each emergency locator transmitter required by paragraph (a) of this section must be inspected within 12 calendar months after the last inspection for— (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.	https://referencesource.org/aircraft-inspection-and-test-intervals/emergency-locator-transmitter/	[ "applies_to", "citation", "consequence", "interval", "item" ]
ATC transponder where data correspondence error could be introduced	§ 91.413	No persons may use an ATC transponder	installation-or-maintenance-on-an-atc-transponder	Following any installation or maintenance on an ATC transponder where data correspondence error could be introduced	Installation or maintenance on an ATC transponder	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.413	No persons may use an ATC transponder that is specified in 91.215(a), 121.345(c), or § 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 maint...	https://referencesource.org/aircraft-inspection-and-test-intervals/installation-or-maintenance-on-an-atc-transponder/	[ "applies_to", "citation", "consequence", "interval", "item" ]
airplane, or helicopter, in controlled airspace under IFR	§ 91.411	No person may operate an airplane, or helicopter, in controlled airspace under IFR	installation-or-maintenance-on-the-automatic-pressure-altitude-reporting-system-	Following installation or maintenance on the automatic pressure altitude reporting system of the ATC transponder	Installation or maintenance on the automatic pressure altitude reporting system of the ATC transponder	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.411	No person may operate an airplane, or helicopter, in controlled airspace under IFR unless— (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 ...	https://referencesource.org/aircraft-inspection-and-test-intervals/installation-or-maintenance-on-the-automatic-pressure-altitude-reporting-system-/	[ "applies_to", "citation", "consequence", "interval", "item" ]
airplane, or helicopter, in controlled airspace under IFR	§ 91.411	No person may operate an airplane, or helicopter, in controlled airspace under IFR	opening-and-closing-of-the-static-pressure-system	following any opening and closing of the static pressure system	Opening and closing of the static pressure system	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.411	No person may operate an airplane, or helicopter, in controlled airspace under IFR unless— (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 ...	https://referencesource.org/aircraft-inspection-and-test-intervals/opening-and-closing-of-the-static-pressure-system/	[ "applies_to", "citation", "consequence", "interval", "item" ]
aircraft	§ 91.409	null	progressive-inspection	within each 12 calendar months	Progressive inspection	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.409	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.	https://referencesource.org/aircraft-inspection-and-test-intervals/progressive-inspection/	[ "applies_to", "citation", "interval", "item" ]
airplane, or helicopter, in controlled airspace under IFR	§ 91.411	No person may operate an airplane, or helicopter, in controlled airspace under IFR	static-pressure-system	Within the preceding 24 calendar months	Static pressure system	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.411	No person may operate an airplane, or helicopter, in controlled airspace under IFR unless— (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 ...	https://referencesource.org/aircraft-inspection-and-test-intervals/static-pressure-system/	[ "applies_to", "citation", "consequence", "interval", "item" ]
civil aircraft under IFR using the VOR system of radio navigation	§ 91.171	No person may operate a civil aircraft under IFR	vor-equipment	within the preceding 30 days	VOR equipment	https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.171	No person may operate a civil aircraft under IFR using the VOR system of radio navigation unless the VOR equipment of that aircraft— (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 per...	https://referencesource.org/aircraft-inspection-and-test-intervals/vor-equipment/	[ "applies_to", "citation", "consequence", "interval", "item" ]

Aircraft inspection and test intervals under 14 CFR Part 91

Canonical, always-current version: https://referencesource.org/aircraft-inspection-and-test-intervals/ Machine-readable: https://referencesource.org/aircraft-inspection-and-test-intervals/data.json — this mirror is a point-in-time copy.

Last verified: 2026-08-06
Stale after: 2028-08-05 (past this date, prefer the canonical copy — it re-verifies on a cadence this snapshot does not)
Records: 13

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.

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