Special Conditions: Embraer S.A. Model EMB-500; Full Authority Digital Engine Control (FADEC) System., 35896-35898 [E8-14383]

Agencies

• Federal Aviation Administration
• DEPARTMENT OF TRANSPORTATION

[Federal Register Volume 73, Number 123 (Wednesday, June 25, 2008)]
[Rules and Regulations]
[Pages 35896-35898]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E8-14383]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 23

[Docket No. CE288; Special Conditions No. 23-228-SC]


Special Conditions: Embraer S.A. Model EMB-500; Full Authority 
Digital Engine Control (FADEC) System.

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions; request for comments.

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SUMMARY: These special conditions are issued for the Embraer S.A. Model 
EMB-500 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 June 16, 2008.
    Comments must be received on or before July 25, 2008.

ADDRESSES: Comments on these special conditions may be mailed in 
duplicate to: Federal Aviation Administration, Regional Counsel, ACE-7, 
Attention: Rules Docket CE288, 901 Locust, Room 506, Kansas City, 
Missouri 64106, or delivered in duplicate to the Regional Counsel at 
the above address. Comments must be marked: CE288. Comments may be 
inspected in the Rules Docket weekdays, except Federal holidays between 
7:30 and 4 p.m.

FOR FURTHER INFORMATION CONTACT: Peter L. Rouse, Federal Aviation 
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

    Interested persons are invited to submit such written data, views, 
or arguments as they may desire. Communications should identify the 
regulatory docket or special condition number and be submitted in 
duplicate to the address specified above. All communications received 
on or before the closing date for comments will be considered by the 
Administrator. The special conditions may be changed in light of the 
comments received. All comments received will be available in

[[Page 35897]]

the Rules Docket for examination by interested persons, both before and 
after the closing date for comments. A report summarizing each 
substantive public contact with FAA personnel concerning this 
rulemaking will be filed in the docket. Commenters wishing the FAA to 
acknowledge receipt of their comments submitted in response to this 
notice must include a self-addressed, stamped postcard on which the 
following statement is made: ``Comments to Docket No. CE288.'' The 
postcard will be date stamped and returned to the commenter.

Background

    On October 5, 2005, Embraer S.A. applied for a type certificate for 
their new Model EMB-500. The Model EMB-500 is a normal category, low-
winged monoplane with ``T'' tailed vertical and horizontal stabilizers, 
retractable tricycle type landing gear and twin turbofan engines 
mounted on the aircraft fuselage. Its design characteristics include a 
predominance of metallic construction. The maximum takeoff weight is 
9,965 pounds, the VMO/MMO is 275 KIAS/M 0.70 and 
maximum altitude is 41,000 feet.
    The Embraer S.A. Model EMB-500 airplane is equipped with Pratt & 
Whitney Canada PW617F turbofan engines using an electronic engine 
control system 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 (Digital Electronic Engine Control) systems be analyzed at a 
higher classification. As of November 2005 FADEC special conditions 
will mandate 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 21.17, Embraer S.A. must show that 
the Model EMB-500 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-500 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-500 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 pursuant to section 611 of Public Law 
92-574, the ``Noise Control Act of 1972.''
    Special conditions, as appropriate, as defined in 11.19, are issued 
in accordance with Sec.  11.38, and become part of the type 
certification basis in accordance with 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 under the provisions of Sec.  21.101.

Novel or Unusual Design Features

    The Embraer S.A. Model EMB-500 will incorporate the following novel 
or unusual design features: Electronic engine control system.

Applicability

    As discussed above, these special conditions are applicable to the 
Model EMB-500. 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 under the provisions of Sec.  21.101.

Conclusion

    This action affects only certain novel or unusual design features 
on one model (Model EMB-500) of airplane. It is not a rule of general 
applicability, and it 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-500 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.

Citation

0
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

0
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 Embraer S.A. Model EMB-500 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 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.


[[Page 35898]]


    Issued in Kansas City, Missouri, on June 16, 2008.
James E. Jackson,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E8-14383 Filed 6-24-08; 8:45 am]
BILLING CODE 4910-13-P