---
kind: "section"
citation: "40 C.F.R. § 1066.830"
title: "40"
number: "1066.830"
heading: "Supplemental Federal Test Procedures; overview."
url: "https://uscodex.org/cfr/40/1066.830"
---

# §1066.830. Supplemental Federal Test Procedures; overview.


Sections [1066.831](/cfr/40/1066.831.md) and [1066.835](/cfr/40/1066.835.md) describe the detailed procedures for the Supplemental Federal Test Procedure (SFTP). This testing applies for Tier 3 vehicles subject to the SFTP standards in 40 CFR [86.1811-17](/cfr/40/86.1811-17.md) or [86.1816-18](/cfr/40/86.1816-18.md). The SFTP test procedure consists of FTP testing and two additional test elements—a sequence of vehicle operation with more aggressive driving and a sequence of vehicle operation that accounts for the impact of the vehicle's air conditioner. Tier 4 vehicles subject to [40 CFR 86.1811-27](/cfr/40/86.1811-27.md) must meet standards for each individual driving cycle.

- (a) The SFTP standard applies as a composite representing the three test elements. The emission results from the aggressive driving test element ([§ 1066.831](/cfr/40/1066.831.md)), the air conditioning test element ([§ 1066.835](/cfr/40/1066.835.md)), and the FTP test element ([§ 1066.820](/cfr/40/1066.820.md)) are analyzed according to the calculation methodology and compared to the applicable SFTP emission standards as described in [40 CFR part 86](/cfr/40/part86.md), subpart S.
- (b) The test elements of the SFTP may be run in any sequence that includes the specified preconditioning steps.

## Notes

### Amendments

[89 FR 28215, Apr. 18, 2024]

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 79 FR 23823, Apr. 28, 2014, unless otherwise noted.

### Amendments

[89 FR 28215, Apr. 18, 2024]