Special Conditions: Embraer S.A. Model EMB-505; Full Authority Digital Engine Control (FADEC) System


Federal Register: May 28, 2009 (Volume 74, Number 101)

Rules and Regulations

Page 25388-25390

From the Federal Register Online via GPO Access [wais.access.gpo.gov]



Federal Aviation Administration 14 CFR Part 23

Docket No. CE295; Special Conditions No. 23-235-SC

Special Conditions: Embraer S.A. Model EMB-505; Full Authority

Digital Engine Control (FADEC) System

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions; request for comments.

SUMMARY: These special conditions are issued for the Embraer S.A. Model

EMB-505 airplane. This airplane will have a novel or unusual design feature(s) associated with the use of an electronic engine control system instead of a traditional mechanical control system. 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.

DATES: The effective date of these special conditions is May 20, 2009.

We must receive your comments by June 29, 2009.

ADDRESSES: Mail two copies of your comments to: Federal Aviation

Administration, Small Airplane Directorate, Attn: Rules Docket (ACE-7),

Docket No. CE295, 901 Locust, Room 301, Kansas City, Missouri 64106.

You may deliver two copies to the Small Airplane Directorate at the above address. Mark your comments: Docket No. CE295. You may inspect comments in the Rules Docket weekdays, except Federal holidays, between 7:30 a.m. and 4 p.m.


Administration, Aircraft Certification Service, Small Airplane

Directorate, ACE-111, 901 Locust, Room 301, Kansas City, Missouri 64106; 816-329-4135, fax 816-329-4090.

SUPPLEMENTARY INFORMATION: The FAA has determined that notice and opportunity for prior public comment hereon are impracticable because these procedures would significantly delay issuance of the design approval and thus delivery of the affected aircraft. In addition, the substance of these special conditions has been subject to the public comment process in several prior instances with no substantive comments received. The FAA therefore finds that good cause exists for making these special conditions effective upon issuance.

Comments Invited

We invite interested people to take part in this rulemaking by sending written comments, data, or views. The most helpful comments reference a specific portion of the special conditions, explain the reason for any recommended change, and include

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supporting data. We ask that you send us two copies of written comments.

We will file in the docket all comments we receive, as well as a report summarizing each substantive public contact with FAA personnel about these special conditions. You may inspect the docket before and after the comment closing date. If you wish to review the docket in person, go to the address in the ADDRESSES section of this preamble between 7:30 a.m. and 4 p.m., Monday through Friday, except Federal holidays.

We will consider all comments we receive by the closing date for comments. We will consider comments filed late if it is possible to do so without incurring expense or delay. We may change these special conditions based on the comments we receive.

If you want us to let you know we received your comments on these special conditions, send us a pre-addressed, stamped postcard on which the docket number appears. We will stamp the date on the postcard and mail it back to you.


On October 9, 2006, Embraer S.A. applied for a type certificate for their new Model EMB-505. The EMB-505 is a twin engine jet which has applied for type certification in the commuter category. As such, the airplane is proposed to be type certificated in the commuter category of 14 CFR part 23 (and comparable Brazilian requirements RBHA 23) by exemption from 14 CFR 23.3(d). The EMB-505 is predominantly of metallic construction and is a conventionally configured low-wing monoplane with a T-tail and tricycle landing gear. The airplane's maximum takeoff weight is 17490 pounds. The VMO/MMOis 320 KCAS/M

.78, with a maximum operating altitude of 45,000 feet. Requested operations are day/night VFR/IFR and icing operations.

The Embraer S.A. Model EMB-505 airplane is equipped with two Pratt and Whitney of Canada 3360 pound thrust PW535E turbofan engines, each using an electronic engine control system (FADEC) instead of a traditional mechanical control system. Even though the engine control system will be certificated as part of the engine, the installation of an engine with an electronic control system requires evaluation due to critical environmental effects and possible effects on or by other airplane systems. For example, indirect effects of lightning, radio interference with other airplane electronic systems, shared engine and airplane data and power sources.

The regulatory requirements in 14 CFR part 23 for evaluating the installation of complex systems, including electronic systems and critical environmental effects, are contained in Sec. 23.1309.

However, when Sec. 23.1309 was developed, the use of electronic control systems for engines was not envisioned. Therefore, the Sec. 23.1309 requirements were not applicable to systems certificated as part of the engine (reference Sec. 23.1309(f)(1)). Although the parts of the system that are not certificated with the engine could be evaluated using the criteria of Sec. 23.1309, the integral nature of systems such as these makes it unfeasible to evaluate the airplane portion of the system without including the engine portion of the system.

In some cases, the airplane that the engine is used in will determine a higher classification (Advisory Circular (AC) 23.1309) than the engine controls are certificated for, which will require that the

FADEC/DEEC systems be analyzed at a higher classification. Since

November 2005, FADEC special conditions have mandated the classification for Sec. 23.1309 analysis for loss of FADEC control as catastrophic for any airplane. This is not to imply that an engine failure is classified as catastrophic, but that the digital engine control must provide an equivalent reliability to mechanical engine controls.

Type Certification Basis

Under the provisions of 14 CFR Sec. 21.17, Embraer S.A. must show that the Model EMB-505 meets the applicable provisions of 14 CFR part 23, as amended by Amendments 23-1 through 23-55, 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 EMB-505 because of a novel or unusual design feature, special conditions are prescribed under the provisions of Sec. 21.16.

In addition to the applicable airworthiness regulations and special conditions, the Model EMB-505 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 Sec. 611 of Public Law 92-574, the ``Noise Control Act of 1972.''

The FAA issues special conditions, as appropriate, as defined in 11.19, under Sec. 11.38, and they become part of the type certification basis under Sec. 21.17(a)(2).

Special conditions are initially applicable to the model for which they are issued. Should the type certificate for that model be amended later to include any other model that incorporates the same novel or unusual design feature, the special conditions would also apply to the other model.

Novel or Unusual Design Features

The Embraer S.A. Model EMB-505 will incorporate the following novel or unusual design features:

Electronic engine control system.


As discussed above, these special conditions are applicable to the

Model EMB-505. Should Embraer S.A. 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, Model EMB-505, of airplane. It is not a rule of general applicability and affects only the applicant who applied to the FAA for approval of these features on the airplane.

Under standard practice, the effective date of final special conditions would be 30 days after the date of publication in the

Federal Register; however, as the certification date for the Embraer

S.A. Model EMB-505 is imminent, the FAA finds that good cause exists to make these special conditions effective upon issuance.

List of Subjects in 14 CFR Part 23

Aircraft, Aviation safety, Signs and symbols.


The authority citation for these special conditions is as follows:

Authority: 49 U.S.C. 106(g), 40113 and 44701; 14 CFR 21.16 and 21.17; and 14 CFR 11.38 and 11.19.

The Special Conditions

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 the Embraer S.A. Model EMB-505 airplanes. 1. Electronic Engine Control

The installation of the electronic engine control system must comply with the requirements of Sec. 23.1309(a) through (e) at

Amendment 23-55. The intent of this requirement is not to reevaluate the inherent hardware

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reliability of the control itself, but rather determine the effects, including environmental effects addressed in Sec. 23.1309(e), on the airplane systems and engine control system when installing the control on the airplane. When appropriate, engine certification data may be used when showing compliance with this requirement; however, the effects of the installation on this data must be addressed.

For these evaluations, the loss of FADEC control will be analyzed utilizing the threat levels associated with a catastrophic failure.

Issued in Kansas City, Missouri on May 20, 2009.

Kim Smith,

Manager, Small Airplane Directorate, Aircraft Certification Service.

FR Doc. E9-12417 Filed 5-27-09; 8:45 am