EPA has issued a March 10, 2014 withdrawal of Broadly Approved Alternative Test Methods 061 and 087 (ALT-061 and ALT-087.)   This withdrawal will be posted on EPA's website, but it has not been yet. 

These Alternative Test Methods, which allowed for gaseous single-point sampling and the waiver of stratification testing for federally regulated engines, are no longer valid and will not be accepted for any upcoming tests.  The requirements for stratification testing and minimum sampling points for these affected engines can now be found in the specific applicable Subparts, as published in the "Revisions to Test Methods and Testing Regulations" final rule published on February 27, 2014 (79 FR 11228.)

If you have a currently approved test protocol that includes ALT-061 or ALT-087 procedures for a test that has not yet been performed, you are responsible for updating the protocol and performing the testing in accordance with the regulations.  Testing that has been completed prior to this posting using these procedures will be accepted.