§38.13. Specific air range.
14 C.F.R. § 38.13
For each airplane subject to this part, the SAR of an airplane must be determined by either:
Direct flight test measurements; or
Using a performance model that is—
Validated by actual SAR flight test data; and
Approved by the FAA before any SAR calculations are submitted.
For the airplane model, establish a 1/SAR value at each of the following reference airplane masses—
High gross mass— 92 percent MTOM.
Low gross mass— (0.45 * MTOM) + (0.63 * (MTOM^0.924)).
Mid gross mass— simple arithmetic average of high gross mass and low gross mass.
To obtain (1/SAR)avg as required to determine the fuel efficiency metric value described in § 38.11, calculate the average of the three 1/SAR values described in paragraph (b) of this section. Do not include auxiliary power units in any 1/SAR calculation.
All determinations made under this section must be made in accordance with the procedures applicable to SAR as described in appendix A to this part.
Notes, amendments, and revision history
Authority
Authority: 42 U.S.C. 4321 et seq., 7572; 49 U.S.C. 106(g), 40113, 44701-44702, 44704; 49 CFR 1.83(c)
Source
Source: Docket No. FAA-2022-0241, Amdt. No. 21-107, 89 FR 12654, Feb. 16, 2024, unless otherwise noted.