In the event a model of aircraft has not been measured in EPNdB for its take-off noise level by the Federal Aviation Administration, or such aircraft is not listed in the advisory circular, and the airport director has reasonable doubt that an aircraft of that model will comply with the noise level standard specified in Section 12.88.520 of this chapter, and technical information concerning noise data on the aircraft as provided in Section 12.88.530 of this chapter is not available or adequate for the airport director to make a determination pursuant to that section, then the airport director may measure or have measured at the operator's expense, the take-off noise level of an aircraft of such model for the purpose of estimating or determining the EPNdB noise level of such aircraft at take-off. The airport director may measure the noise level in dBA (A-weighted decibels) using the same or substantially similar measuring techniques and procedures as used by the Federal Aviation Administration. In lieu of actual measurement of noise level of aircraft, the airport director may use the estimated dBA (A-weighted decibels) noise level, at take-off of aircraft as set forth in the publications of the Department of Transportation, Federal Aviation Administration described as follows: (1) Advisory Circular AC No. 36-3, Appendix I, dated May 29, 1979, and (2) Advisory Circular AC No. 36-2A, Appendix III, dated February 6, 1978, and future amendments to or replacement of such advisory circulars. After determining the dBA (A-weighted decibels) noise level of such aircraft, the airport director shall convert such dBA level to the estimated EPNdB noise level. (Prior code § 4.04.104)