---
kind: "section"
citation: "40 C.F.R. § 1036.425"
title: "40"
number: "1036.425"
heading: "Pass criteria for engine families."
url: "https://uscodex.org/cfr/40/1036.425"
---

# §1036.425. Pass criteria for engine families.


For testing with PEMS under [§ 1036.415(d)(1)](/cfr/40/1036.415.md?p=d-1), determine the number of engines you must test from each selected engine family and the family pass criteria as follows:

- (a) Start by measuring emissions from five engines using the procedures described in this subpart E and [§ 1036.530](/cfr/40/1036.530.md). If all five engines comply fully with the off-cycle bin standards, the engine family passes, and you may stop testing.
- (b) If only one of the engines tested under [paragraph (a)](#a) of this section does not comply fully with the off-cycle bin standards, test one more engine. If this additional engine complies fully with the off-cycle bin standards, the engine family passes, and you may stop testing.
- (c) If two or more engines tested under paragraphs [(a)](#a) and [(b)](#b) of this section do not comply fully with the off-cycle bin standards, test additional engines until you have tested a total of ten engines. Calculate the arithmetic mean of the bin emissions from the ten engine tests as specified in [§ 1036.530(g)](/cfr/40/1036.530.md?p=g) for each pollutant. If the mean values are at or below the off-cycle bin standards, the engine family passes. If the mean value for any pollutant is above an off-cycle bin standard, the engine family fails.
- (d) You may accept a fail result for the engine family and discontinue testing at any point in the sequence of testing the specified number of engines.

## Notes

### Authority

Authority: 42 U.S.C. 7401—7671q.

### Source

Source: 88 FR 4487, Jan. 24, 2023, unless otherwise noted.