Source: https://www.federalregister.gov/documents/2009/11/04/E9-26596/special-conditions-cessna-aircraft-company-model-525c-flight-performance-flight-characteristics-and
Timestamp: 2018-04-27 07:07:52
Document Index: 481883357

Matched Legal Cases: ['art 21', '§\u200921', 'art 23', 'art 23', '§\u200921', 'art 34', 'art 36', '§\u2009611', '§\u200923', '§\u200923', '§\u200923']

Federal Register :: Special Conditions: Cessna Aircraft Company, Model 525C; Flight Performance, Flight Characteristics, and Operating Limitations
Special Conditions: Cessna Aircraft Company, Model 525C; Flight Performance, Flight Characteristics, and Operating Limitations
A Rule by the Federal Aviation Administration on 11/04/2009
The effective date of these special conditions is November 4, 2009. We must receive your comments by December 4, 2009.
74 FR 57060
57060-57061 (2 pages)
Docket No. CE300
Special Conditions No. 23-240-SC
E9-26596
https://www.federalregister.gov/d/E9-26596 https://www.federalregister.gov/d/E9-26596
These special conditions are issued for the Cessna Aircraft Company, Model 525C airplane. This airplane will have a novel or unusual design feature(s) associated with turbofan engines, engine location, and certain performance characteristics necessary for this type of airplane that were not envisioned by the existing regulations. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.
Mail two copies of your comments to: Federal Aviation Administration, Regional Counsel, ACE-7, Attn: Rules Docket No. CE300, 901 Locust, Kansas City, MO 64106. You may deliver two copies to the Regional Counsel at the above address. Mark your comments: Docket No. CE300. You may inspect comments in the Rules Docket weekdays, except Federal holidays, between 7:30 a.m. and 4 p.m.
Mr. Lowell Foster, Federal Aviation Administration, Small Airplane Directorate, Aircraft Certification Service, 901 Locust, Room 301, Kansas City, MO 64106; telephone (816) 329-4125; facsimile (816) 329-4090.
On June 28, 2007, Cessna Aircraft Company applied for a type certificate for their new Model Cessna Model 525C. The Cessna Model 525C is a commuter category derivative configuration of the Model 525B airplane with unique turbofan engines, engine location, and certain performance characteristics necessary for this type of airplane. Unlike similar commuter category jet projects, these special conditions reflect the model history of the model 525 back through normal category for consistency in training.
Under the provisions of 14 CFR, part 21, § 21.17, Cessna Aircraft Company must show that the Cessna Model 525C meets the applicable provisions of part 23, as amended by Amendment 23-1 through 23-59 thereto.
If the Administrator finds that the applicable airworthiness regulations (i.e., 14 CFR part 23) do not contain adequate or appropriate safety standards for the Model 525C because of a novel or unusual design feature, special conditions are prescribed under the provisions of § 21.16.
In addition to the applicable airworthiness regulations and special conditions, the Model 525C must comply with the fuel vent and exhaust emission requirements of 14 CFR part 34 and the noise certification requirements of 14 CFR part 36; and the FAA must issue a finding of regulatory adequacy under § 611 of Public Law 92-574, the “Noise Control Act of 1972.”
The Cessna Model 525C will incorporate the following novel or unusual design features: Two aft mounted Williams International FJ44-4A turbofan engines rated at 3,400 pounds of thrust with a Full Authority Digital Engine Control (FADEC) system and other performance characteristics that were not envisioned by the regulations when the Model 525 was originally certificated.
As discussed above, these special conditions are applicable to the Cessna Model 525C. Should Cessna Aircraft Company apply at a later date for a change to the type certificate to include another model incorporating the same novel or unusual design feature, the special conditions would apply to that model as well.
This action affects only certain novel or unusual design features on one model of airplane. It is not a rule of general Start Printed Page 57061applicability and affects only the applicant who applied to the FAA for approval of these features on the airplane.
Accordingly, pursuant to the authority delegated to me by the Administrator, the following special conditions are issued as part of the type certification basis for Cessna Model 525C airplanes.
1. SC 23.161, Trim
Instead of the requirements of § 23.161(b)(2), the following applies:
(b)(2) For commuter category airplanes, at all speeds from 1.4 VS1 to VMO/MMO.
2. SC 23.181, Dynamic stability
Instead of compliance with the requirements of § 23.181(a), and (d), the following applies:
(a) Any short period oscillation, not including combined lateral-directional oscillations, occurring between 1.2 VS and the maximum allowable speed appropriate to the configuration of the airplane must be heavily damped with the primary controls—
(d) During the conditions as specified in § 23.175, when the longitudinal control force required to maintain speeds differing from the trim speed by at least plus and minus 15 percent or 15 knots, whichever is less, is released after first returning the control to the original trimmed position, the response of the airplane must not exhibit any dangerous characteristics nor be excessive in relation to the magnitude of the control force prior to release. Any long-period oscillation of flight path, phugoid oscillation, that results must not be so unstable as to increase the pilot's workload or otherwise endanger the airplane.
Issued in Kansas City, Missouri, on October 28, 2009.
[FR Doc. E9-26596 Filed 11-3-09; 8:45 am]