S. 2503

ROTOR Act

Official summary

Written by the Congressional Research Service.

Rotorcraft Operations Transparency and Oversight Reform Act or the ROTOR Act

This bill addresses aviation safety by increasing requirements for aircraft tracking and communication using Automatic Dependent Surveillance-Broadcast (ADS-B) technology and expanding oversight.

As background, ADS-B for broadcasting (Out) and receiving (In) transmits information (e.g., location and weather information) between aircraft and air traffic control.

Under the bill, aircraft must generally operate with ADS-B In equipment to provide the aircraft with location information of other aircraft and traffic advisories. Current law does not require this equipment.

Current Federal Aviation Administration (FAA) regulations allow aircraft performing a sensitive government mission to be excepted from requirements for using ADS-B Out equipment. This bill limits which flights may be considered sensitive government missions (e.g., not training flights) and requires additional reporting and notifications for the exception.

The Government Accountability Office must review the use of the ADS-B Out exception and the Office of the Inspector General (OIG) of the Department of Transportation must annually audit FAA oversight of operations that use the exception.

Further, the bill repeals a 2025 law that exempts certain military helicopters from the ADS-B Out requirements for the Washington, DC, metropolitan area.

The bill also requires

  • the OIG of the Army to audit the Army’s coordination with the FAA,
  • the FAA to establish an office to coordinate airspace usage of military aircraft and review the safety of flight operations and routes around airports, and
  • the FAA to enter into memoranda of understanding with military agencies for safety information sharing.

Text of the bill

Expand all
Sec. 3. Revision to Exception for ADS–B Out Transmission Changed · Dec 17, 2025

Where this section came from

  1. Jul 29, 2025 · Introduced in Senate Referred to Senate Committee on Commerce, Science, and Transportation, Jul 29, 2025
  2. Dec 17, 2025 · Engrossed in Senate S.Amdt. 4070: In the nature of a substitute. Official page ›
What changed in the text

(a) Rulemaking ADS–B Out reforms . (1) In general. Not (A) later Sensitive than government 1 mission. year Beginning after on the date of enactment of this section, the in Administrator applying section 91.225(f)(1) of the title 14, Code of Federal Aviation Regulations, Administration the (in term this sensitive Act government referred mission to shall as be the narrowly Administrator) construed and shall issue not or include revise routine regulations flights, to non-classified clarify flights, that proficiency flights , with or respect flights to of Federal officials below the exception rank described of in Cabinet Member or the Chairman of the Joint Chiefs of Staff. (B) Notification. For the purposes of interpreting section 91.225(f)(1) of title 14, Code of Federal Regulations, the term operating agency shall— (i) when operating a sensitive government mission shall during which the aircraft will not include be any transmitting proficiency ADS–B evaluation Out, or notify training Air mission Traffic operated Control; within and (ii) notify the lateral Committee boundaries on Commerce, Science, and Transportation and the Committee on the Armed Services of the surface Senate area and the Committee on Transportation and Infrastructure and the Committee on the Armed Services of Class the B House or of Representatives on a monthly basis regarding each sensitive government mission within Class C B airspace , unless operated during such operation month. is (2) for Rulemaking a and national administrative security event action . ( 2 A ) Report In general . If Not later than 1 year after the date of enactment of this section, the Administrator fails shall— to (i) issue or revise regulations pursuant to paragraph update section 91.225 ( 1), f) the of Administrator title shall 14 , within Code 30 of days Federal Regulations , submit to comply with the Committee requirements on of Commerce, this Science, section; and Transportation (ii) revise any memorandum of agreement between the Senate FAA and any other Federal, State, local, or Tribal agency to conform with the Committee revised on regulations Transportation described and in Infrastructure clause (i), including any agreement pursuant to section 1046 of the House John S. McCain National Defense Authorization Act for Fiscal Year 2019 (49 U.S.C. 40101 note). (B) Report. If the Administrator fails to issue or revise regulations pursuant to subparagraph (A) or revise any memorandum of Representatives agreement between the FAA and any other agency pursuant to such subparagraph, the Administrator shall, within 30 days, submit to the appropriate committees of Congress a report on the status of such regulations, including the reasons that the Administrator has failed to issue or revise such regulations within the period required under such subparagraph . (b) Guidance GAO on review use and of report. technology Not other later than ADS–B. the Not date later that than is 180 2 days years after the date of enactment of this section, the Administrator Comptroller General of the United States shall — issue (1) guidance review to the clarify utilization that of exceptions under section 91.225(f) of title 14 , Code of Federal Regulations (or any successor regulation), as revised under subsection (a), to determine— (A) whether the Department of Defense and other relevant Federal agencies or other applicable operators have utilized such exceptions in accordance with relevant laws and regulations; and (B) the extent practicable, of all such aircraft utilization; operating (2) for compare purposes the utilization of national exceptions defense, specified homeland in security such intelligence, section or 91.225(f) law before enforcement and should after utilize the Traffic issuance Information of Services–Broadcast revised regulations under subsection ( TIS–B a); and (3 ) submit to the Administrator and the Traffic appropriate Alert committees of Congress a report on the findings of the review conducted under paragraph (1) and Collision the Avoidance comparison System conducted under paragraph ( TCAS 2 ). (c) FAA review of non-compliant operators. Upon submission of the report under subsection (b)(3), the Administrator shall— (1) determine whether any Federal agency or other applicable operator that has been found to have not utilized the exceptions under section 91.225(f) of title 14, Code of Federal Regulations (or any successor regulation), as revised under subsection (a), in accordance with relevant laws and regulations shall be permitted to continue to utilize such exceptions; and (2) not later than 30 days after the date on which the Comptroller General submits the report under subsection (b)(3), brief the appropriate committees of Congress on such determination. (d) Reports. (1) To the Administrator. Not later than 90 days after the date of enactment of this section, each and agency on required a to quarterly operate basis Automatic thereafter, Dependent each Surveillance–Broadcast Federal, Out State, (in local, this and Act Tribal referred agency to that as performs ADS–B sensitive Out) government in missions transmit as mode described in accordance with section 91.225 (f)(1) of such title 14 , shall Code submit of to Federal the Regulations Administrator, (or on any a successor quarterly regulation), basis as until revised the under date subsection described (a), in shall paragraph submit (3), to the Administrator a report that includes— (A) an attestation that such operations are regularly transmitting ADS–B Out and are conducted with proper consideration to aviation safety; and (B) a summary list of operations delineated by flight in which the ADS–B Out equipment is not in transmit mode because the aircraft was performing a sensitive government mission , including the airport, airspace location, date, time, duration, and mission type of each such operations operation; and (C) with respect to any classified operation, a classified annex .

(2) To Congress.

(A) In general. Not later than 180 days after the date of enactment of this section, and biannually thereafter , until the date described in paragraph (3), the Administrator shall submit to the Committee appropriate on committees Commerce, Science, and Transportation of the Congress Senate and the Committee on Transportation and Infrastructure of the House of Representatives a report on the frequency and nature of the ADS–B Out exceptions granted to Federal, State, local, and tribal Tribal agencies under section 91.225(f)(1) of title 14, Code of Federal Regulations . (or any successor regulation), as revised under subsection (a). Such report — (i) shall include— ( i I ) aggregated data on the operations in which ADS–B Out equipment is not in transmit mode by each agency described in paragraph (1); and ( ii II ) a determination from the Administrator as to whether such each operations operation jeopardize described in paragraph (1)(B) jeopardizes aviation safety ; and (ii) may include a classified annex . (B) Special notification. If the Administrator determines that an agency described in paragraph (1) is operates too a frequently, flight at the discretion of the Administrator, using exceptions an exception granted under section 91.225(f)(1) of such title 14, the Code Administrator of shall Federal notify Regulations the (or Committee any on successor Commerce, regulation), Science as revised under subsection (a), 5 or more times in a calendar month , and or Transportation fails of to the provide Senate to and the Administrator the Committee attestation on required Transportation under and paragraph Infrastructure (1)(A), of the Administrator shall notify the House appropriate committees of Representatives Congress of such determination use within 14 days of being notified of such determination use . (3) For Sunset the purposes of this subparagraph, a flight shall be interpreted as the period beginning when an aircraft moves under its own power for the purpose of flight and ending when the aircraft lands . The (e) reporting Annual requirements Inspector described General in audits. this (1) subsection In shall general. terminate Beginning on the date that is 10 3 years after the date of enactment of this section , the Inspector General of the Department of Transportation (in this section referred to as the Inspector General) shall conduct an annual audit of FAA oversight of all operations that utilize an exception under section 91 . 225(f) of title 14, Code of Federal Regulations (or any successor regulation), as revised under subsection (a), including Federal agency operations. (2) Considerations. In conducting an audit under paragraph (1), the Inspector General shall assess the efficacy of FAA oversight related to the following: (A) Ensuring exceptions under such section 91.225(f)(1) (or any successor regulation) are strictly utilized by operators in accordance with relevant laws and regulations. (B) Ensuring exceptions under such section 91.225(f)(1) (or any successor regulation) are not routinely used by operators. (C) Identifying and engaging with any operator not in compliance with relevant laws and regulations relating to exceptions under such section 91.225(f)(1) (or any successor regulation). (D) Any other factor determined appropriate by the Inspector General. (3) Briefings to Congress. The Inspector General shall brief the appropriate committees of Congress on an annual basis after the completion of each annual audit.

(a) ADS–B Out reforms

(1) In general

(A) Sensitive government mission. Beginning on the date of enactment of this section, in applying section 91.225(f)(1) of title 14, Code of Federal Regulations, the term sensitive government mission shall be narrowly construed and shall not include routine flights, non-classified flights, proficiency flights, or flights of Federal officials below the rank of Cabinet Member or the Chairman of the Joint Chiefs of Staff.

(B) Notification. For the purposes of interpreting section 91.225(f)(1) of title 14, Code of Federal Regulations, the operating agency shall—

(i) when operating a sensitive government mission during which the aircraft will not be transmitting ADS–B Out, notify Air Traffic Control; and

(ii) notify the Committee on Commerce, Science, and Transportation and the Committee on the Armed Services of the Senate and the Committee on Transportation and Infrastructure and the Committee on the Armed Services of the House of Representatives on a monthly basis regarding each sensitive government mission within Class B airspace operated during such month.

(2) Rulemaking and administrative action

(A) In general. Not later than 1 year after the date of enactment of this section, the Administrator shall—

(i) issue or revise regulations to update section 91.225(f) of title 14, Code of Federal Regulations, to comply with the requirements of this section; and

(ii) revise any memorandum of agreement between the FAA and any other Federal, State, local, or Tribal agency to conform with the revised regulations described in clause (i), including any agreement pursuant to section 1046 of the John S. McCain National Defense Authorization Act for Fiscal Year 2019 (49 U.S.C. 40101 note).

(B) Report. If the Administrator fails to issue or revise regulations pursuant to subparagraph (A) or revise any memorandum of agreement between the FAA and any other agency pursuant to such subparagraph, the Administrator shall, within 30 days, submit to the appropriate committees of Congress a report on the status of such regulations, including the reasons that the Administrator has failed to issue or revise such regulations within the period required under such subparagraph.

(b) GAO review and report. Not later than the date that is 2 years after the date of enactment of this section, the Comptroller General of the United States shall—

(1) review the utilization of exceptions under section 91.225(f) of title 14, Code of Federal Regulations (or any successor regulation), as revised under subsection (a), to determine—

(A) whether the Department of Defense and other relevant Federal agencies or other applicable operators have utilized such exceptions in accordance with relevant laws and regulations; and

(B) the extent of such utilization;

(2) compare the utilization of exceptions specified in such section 91.225(f) before and after the issuance of revised regulations under subsection (a); and

(3) submit to the Administrator and the appropriate committees of Congress a report on the findings of the review conducted under paragraph (1) and the comparison conducted under paragraph (2).

(c) FAA review of non-compliant operators. Upon submission of the report under subsection (b)(3), the Administrator shall—

(1) determine whether any Federal agency or other applicable operator that has been found to have not utilized the exceptions under section 91.225(f) of title 14, Code of Federal Regulations (or any successor regulation), as revised under subsection (a), in accordance with relevant laws and regulations shall be permitted to continue to utilize such exceptions; and

(2) not later than 30 days after the date on which the Comptroller General submits the report under subsection (b)(3), brief the appropriate committees of Congress on such determination.

(d) Reports

(1) To the Administrator. Not later than 90 days after the date of enactment of this section, and on a quarterly basis thereafter, each Federal, State, local, and Tribal agency that performs sensitive government missions as described in section 91.225(f)(1) of title 14, Code of Federal Regulations (or any successor regulation), as revised under subsection (a), shall submit to the Administrator a report that includes—

(A) an attestation that such operations are regularly transmitting ADS–B Out and are conducted with proper consideration to aviation safety;

(B) a list of operations delineated by flight in which the ADS–B Out equipment is not in transmit mode because the aircraft was performing a sensitive government mission, including the airport, airspace location, date, time, duration, and mission type of each such operation; and

(C) with respect to any classified operation, a classified annex.

(2) To Congress

(A) In general. Not later than 180 days after the date of enactment of this section, and biannually thereafter, the Administrator shall submit to the appropriate committees of Congress a report on the frequency and nature of the ADS–B Out exceptions granted to Federal, State, local, and Tribal agencies under section 91.225(f)(1) of title 14, Code of Federal Regulations (or any successor regulation), as revised under subsection (a). Such report—

(i) shall include—

(I) aggregated data on the operations in which ADS–B Out equipment is not in transmit mode by each agency described in paragraph (1); and

(II) a determination from the Administrator as to whether each operation described in paragraph (1)(B) jeopardizes aviation safety; and

(ii) may include a classified annex.

(B) Special notification. If an agency described in paragraph (1) operates a flight using an exception granted under section 91.225(f)(1) of title 14, Code of Federal Regulations (or any successor regulation), as revised under subsection (a), 5 or more times in a calendar month, or fails to provide to the Administrator the attestation required under paragraph (1)(A), the Administrator shall notify the appropriate committees of Congress of such use within 14 days of being notified of such use. For the purposes of this subparagraph, a flight shall be interpreted as the period beginning when an aircraft moves under its own power for the purpose of flight and ending when the aircraft lands.

(e) Annual Inspector General audits

(1) In general. Beginning on the date that is 3 years after the date of enactment of this section, the Inspector General of the Department of Transportation (in this section referred to as the Inspector General) shall conduct an annual audit of FAA oversight of all operations that utilize an exception under section 91.225(f) of title 14, Code of Federal Regulations (or any successor regulation), as revised under subsection (a), including Federal agency operations.

(2) Considerations. In conducting an audit under paragraph (1), the Inspector General shall assess the efficacy of FAA oversight related to the following:

(A) Ensuring exceptions under such section 91.225(f)(1) (or any successor regulation) are strictly utilized by operators in accordance with relevant laws and regulations.

(B) Ensuring exceptions under such section 91.225(f)(1) (or any successor regulation) are not routinely used by operators.

(C) Identifying and engaging with any operator not in compliance with relevant laws and regulations relating to exceptions under such section 91.225(f)(1) (or any successor regulation).

(D) Any other factor determined appropriate by the Inspector General.

(3) Briefings to Congress. The Inspector General shall brief the appropriate committees of Congress on an annual basis after the completion of each annual audit.