§ 38.13. Specific air range.

169 words·~1 min read·/us/cfr/t14/s§ 38.13·

A research copy — for the controlling text, always check the official state or federal source. Not legal advice.

(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 submitted.

(b)For the airplane model, establish a 1/SAR value at each of the following reference airplane masses:

(1)High gross mass: 92 percent 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)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.

(d)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.