---
kind: "section"
citation: "40 C.F.R. § 1030.23"
title: "40"
number: "1030.23"
heading: "Specific air range (SAR)."
url: "https://uscodex.org/cfr/40/1030.23"
---

# §1030.23. Specific air range (SAR).

- (a) For each airplane subject to this part the SAR of an airplane must be determined by either:
  - (1) Direct flight test measurements; or
  - (2) **Using a performance model that is—**
    - (i) Validated by actual SAR flight test data; and
    - (ii) **Approved by the FAA before any SAR calculations are made.**
- (b) **For each airplane model, establish a 1/SAR value at each of the following reference airplane masses—**
  - (1) **High gross mass—** 92 percent maximum takeoff mass (MTOM).
  - (2) **Low gross mass—** (0.45 * MTOM) + (0.63 * (MTOM^0.924)).
  - (3) **Mid gross mass—** Simple arithmetic average of high gross mass and low gross mass.
- (c) Calculate the average of the three 1/SAR values described in [paragraph (b)](#b) of this section to calculate the fuel efficiency metric value in [§ 1030.20](/cfr/40/1030.20.md). Do not include auxiliary power units in any 1/SAR calculation.
- (d) All determinations under this section must be made according to the procedures applicable to SAR in Paragraphs 2.5 and 2.6 of ICAO Annex 16, Volume III and Appendix 1 of ICAO Annex 16, Volume III (incorporated by reference in [§ 1030.110](/cfr/40/1030.110.md)).

## Notes

### Amendments

[86 FR 2172, Jan. 11, 2021; 86 FR 52416, Sept. 21, 2021]

### Authority

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

### Source

Source: 86 FR 2171, Jan. 11, 2021, unless otherwise noted.

### Amendments

[86 FR 2172, Jan. 11, 2021; 86 FR 52416, Sept. 21, 2021]