40 CFR 90.1205 - In-use test program reporting requirements.
(a) The manufacturer shall submit to the Administrator within ninety (90) days of completion of testing for a given model year's engines, all emission testing results generated from the voluntary in-use testing program. The following information must be reported for each test engine:
(11) A listing of any test engines that were deleted from the aging process or testing process and technical justifications to support the deletion.
Title 40 published on 2013-07-01
no entries appear in the Federal Register after this date.