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HR 3935 PCS
plement, or execute a policy, program, order, or contract 
of any kind with the Chinese Communist Party or any 
Chinese-owned entity unless such activities are specifically 
authorized by a law enacted after the date of enactment 
of this title. 
SEC. 1151. CENTER OF EXCELLENCE FOR ALTERNATIVE 
JET FUELS AND ENVIRONMENT (ASCENT). 
The Center of Excellence for Alternative Jet Fuels 
and Environment (ASCENT) shall subject to the avail-
ability of appropriations for such purpose and consistent 
with the research and development strategy in section 
1133, conduct research on hydrogen to increase aviation 
decarbonization. Such research shall be in addition to any 
other research authorized to be carried out by the Center, 
including other research relating to hydrogen. 
SEC. 1152. STUDY ON AERONAUTICAL STANDARDS. 
(a) STUDY REQUIRED.—The Administrator of the 
National Aeronautics and Space Administration, in con-
sultation with the Secretary of Defense, the Administrator 
of the Federal Aviation Administration, and the Adminis-
trator of the National Oceanic and Atmospheric Adminis-
tration, shall conduct a study on the modernization of 
aeronautical standards. 
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(b) DESIGNATION.—The study conducted under sub-
section (a) shall be known as the ‘‘Modernization of Aero-
nautical Standards and Aircraft Performance Study’’. 
(c) ELEMENTS.—The study conducted under sub-
section (a) shall include the following: 
(1) An assessment of differences between cur-
rent atmospheric conditions and baseline atmos-
pheric conditions, including both mean and extreme 
values. 
(2) An analysis of the impacts to operation, 
maintenance, and sustainment costs of covered com-
mercial aircraft due to the differences identified 
under paragraph (1). 
(3) An estimation of the number of weight re-
striction hours for covered commercial aircraft at 
covered commercial airports under baseline, current, 
and projected atmospheric conditions. 
(4) An assessment of required infrastructure in-
vestment at covered commercial airports such that 
the number of weight restriction hours under pro-
jected atmospheric conditions is equivalent to the 
number of weight restriction hours with current in-
frastructure and route structure under baseline and 
current atmospheric conditions. 
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HR 3935 PCS
(5) Recommendations for atmospheric and cli-
matic design requirements for future commercial air-
craft to account for projected atmospheric condi-
tions. 
(6) An analysis of impacts to operation, mainte-
nance, and sustainment costs and aircraft perform-
ance of military aircraft due to the differences iden-
tified under paragraph (1). 
(7) Atmospheric and climatic design require-
ments for military aircraft, or other equipment, 
which should be updated to account for current and 
projected atmospheric conditions. 
(8) Recommended updates or supplements to 
atmospheric standards due to current atmospheric 
conditions. 
(9) Criteria under which future updates or sup-
plements to atmospheric standards should be made. 
(d) TRANSMITTAL.—The Administrator of the Na-
tional Aeronautics and Space Administration shall trans-
mit the results of the study to the Committee on Science, 
Space, and Technology and the Committee on Transpor-
tation and Infrastructure of the House of Representatives, 
the Committee on Commerce, Science, and Transportation 
of the Senate, and the congressional defense committees 
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HR 3935 PCS
not later than 18 months after the date of the enactment 
of this Act. 
(e) DEFINITIONS.—In this section: 
(1) AIRCRAFT PERFORMANCE.—The term ‘‘air-
craft performance’’ includes the following: 
(A) Range. 
(B) Payload capacity. 
(C) Runway length requirement. 
(D) Climb rate. 
(E) Turn rate. 
(F) Operating altitude. 
(G) Acceleration. 
(2) ATMOSPHERIC STANDARDS.—The term ‘‘at-
mospheric standards’’ means the following: 
(A) The United States Standard Atmos-
phere of 1976. 
(B) MIL–HDBK–310, Climatic Informa-
tion to Determine Design and Test Require-
ments for Military Systems and Equipment. 
(C) Any other standard as determined by 
the Administrator of the National Aeronautics 
and Space Administration. 
(3) BASELINE
ATMOSPHERIC
CONDITIONS.— 
The term ‘‘baseline atmospheric conditions’’ means 
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the atmospheric conditions referred to in the most 
recent release of an atmospheric standard. 
(4) COVERED
COMMERCIAL
AIRPORTS.—The 
term ‘‘covered commercial airports’’ means the fol-
lowing: 
(A) The 30 commercial service airports (as 
such term is defined in section 47102(7) of title 
49, United States Code) with the most pas-
senger boardings in the most recent calendar 
year ending before the date of the enactment of 
this Act. 
(B) The five public airports (as such term 
is defined in section 47102(21) of title 49, 
United States Code) not described in clause (i) 
with the highest all-cargo landed weight in the 
most recent calendar year ending before the 
date of the enactment of this Act. 
(5) COVERED
COMMERCIAL
AIRCRAFT.—The 
term ‘‘covered commercial aircraft’’ means the ten 
aircraft types still in production with the highest 
number of operations at covered commercial airports 
in the most recent calendar year ending before the 
date of the enactment of this Act. 
(6) COMMERCIAL AIRCRAFT.—The term ‘‘com-
mercial aircraft’’ means an air carrier operating 
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under part 121 of title 14, Code of Federal Regula-
tions. 
(7) CONGRESSIONAL DEFENSE COMMITTEES.— 
The term ‘‘congressional defense committees’’ has 
the meaning given that term in section 101(a)(16) 
of title 10, United States Code. 
(8) CURRENT ATMOSPHERIC CONDITIONS.—The 
term ‘‘current atmospheric conditions’’ means the 
atmospheric conditions observed in the five most re-
cent calendar years ending before the date of the en-
actment of this Act. 
(9) PROJECTED ATMOSPHERIC CONDITIONS.— 
The term ‘‘projected atmospheric conditions’’ means 
the mean atmospheric conditions projected by the 
International Panel on Climate Change under the 
Sixth Assessment Report in scenarios— 
(A) SSP1–1.9; 
(B) SSP1–2.6; 
(C) SSP2–4.5; 
(D) SSP3–7.0; and 
(E) SSP5–8.5. 
(10) MILITARY AIRCRAFT.—The term ‘‘military 
aircraft’’ means an aircraft that— 
(A) is currently being developed, procured, 
or operated by the Department of Defense; and 
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