Advisory Circular No. 450.169-1A, Launch and Reentry Collision Avoidance Analysis. Federal Register, NASA notice of availability. Summary: “The Federal Aviation Administration (FAA) is solicitating public comment on its intentions to revise an existing Advisory Circular (AC) that provides guidance to launch and reentry vehicle operators on how to complete launch and reentry collision avoidance analyses for the purpose of vehicle operator license applications. Specifically, the proposed revisions would clarify that, for certain commercial launch and reentry operations supporting National Aeronautics and Space Administration (NASA) missions, collision avoidance (COLA) analyses may be obtained from two NASA components. The current version of the AC only identifies the 19th Space Defense Squadron (SDS) as an FAA-approved COLA provider.” Comments due October 17th, 2025.
Octamethylcyclotetrasiloxane (Cyclotetrasiloxane, 2,2,4,4,6,6,8,8-octamethyl-) (D4); Draft Risk Evaluation Under the Toxic Substances Control Act (TSCA); Notice of Availability and Request for Comment. Federal Register, EPA TSCA risk assessment notice. Summary: “The Environmental Protection Agency (EPA or Agency) is announcing the availability of and seeking public comment on a draft risk evaluation under the Toxic Substances Control Act (TSCA) for Octamethylcyclotetrasiloxane (Cyclotetrasiloxane, 2,2,4,4,6,6,8,8-octamethyl-) (D4) (CASRN 556-67-2). The purpose of risk evaluations under TSCA is to determine whether a chemical substance presents an unreasonable risk of injury to health or the environment under the conditions of use (COUs), including unreasonable risk to potentially exposed or susceptible subpopulations identified as relevant to the risk evaluation by EPA, and without consideration of costs or non-risk factors. EPA used the best available science to prepare this draft risk evaluation and to preliminarily determine, based on the weight of scientific evidence, that D4 poses unreasonable risk to human health and the environment driven primarily by certain conditions of use analyzed in the draft risk evaluation.” Comments due: November 17th, 2025.
Trichloroethylene; Regulation Under the Toxic Substances
Control Act (TSCA); Compliance Date Extension. Federal Register, EPA interim
final rule. Summary: “Specifically, EPA is amending the prohibition
compliance date for the use of TCE as a processing aid in the manufacture of
nuclear fuel, with corresponding changes to the compliance dates for the
manufacturing, processing and distribution in commerce of TCE to support such
use, to a prohibition on September 15, 2028. EPA is also amending the
prohibition compliance date for the disposal of TCE to wastewater by processors
of TCE and processors and industrial and commercial users of TCE as a
processing aid, to begin on December 18, 2026. EPA is also amending the
compliance deadline for downstream notification, and the text required to be
present in Safety Data Sheets, to accurately reflect the new prohibition
compliance deadline for TCE used as a processing aid in the manufacture of
nuclear fuel. EPA is amending this compliance deadline to allow for 90 days
after the publication of the final rule for manufacturers, processors, and
distributors in commerce of TCE to make such a change. These revisions are necessary
to address new information presented to EPA about inadvertent oversights in the
original rulemaking and serious concerns that the facilities at issue will be
unable to comply with the relevant requirements by the existing deadlines. EPA
is requesting comments on all aspects of this interim final rule and will
consider all comments received in determining whether amendments to this rule
are appropriate after the conclusion of the comment period.” Comments due: October
17th, 2025.
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