[Federal Register Volume 78, Number 33 (Tuesday, February 19, 2013)]
[Rules and Regulations]
[Pages 11553-11554]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2013-03656]

[[Page 11553]]



Federal Aviation Administration

14 CFR Part 25

[Docket No. FAA-2012-0978; Special Conditions No. 25-478-SC]

Special Conditions: Embraer S.A., Model EMB-550 Airplane; 
Electronic Flight Control System: Control Surface Awareness and Mode 

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions.


SUMMARY: These special conditions are issued for the Embraer S.A. Model 
EMB-550 airplane. This airplane will have a novel or unusual design 
feature(s) associated with the control surface awareness and mode 
annunciation of the electronic flight 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: Effective Date: March 21, 2013.

FOR FURTHER INFORMATION CONTACT: Joe Jacobsen, FAA, Airplane and Flight 
Crew Interface Branch, ANM-111, Transport Airplane Directorate, 
Aircraft Certification Service, 1601 Lind Avenue SW., Renton, 
Washington 98057-3356; telephone 425-227-2011; facsimile 425-227-1149.



    On May 14, 2009, Embraer S.A. applied for a type certificate for 
their new Model EMB-550 airplane. The Model EMB-550 airplane is the 
first of a new family of jet airplanes designed for corporate flight, 
fractional, charter, and private owner operations. The aircraft has a 
conventional configuration with low wing and T-tail empennage. The 
primary structure is metal with composite empennage and control 
surfaces. The Model EMB-550 airplane is designed for 8 passengers, with 
a maximum of 12 passengers. It is equipped with two Honeywell HTF7500-E 
medium bypass ratio turbofan engines mounted on aft fuselage pylons. 
Each engine produces approximately 6,540 pounds of thrust for normal 
takeoff. The primary flight controls consist of hydraulically powered 
fly-by-wire elevators, aileron and rudder, controlled by the pilot or 
copilot sidestick.

Type Certification Basis

    Under the provisions of Title 14, Code of Federal Regulations (14 
CFR) 21.17, Embraer S.A. must show that the Model EMB-550 airplane 
meets the applicable provisions of part 25, as amended by Amendments 
25-1 through 25-127.
    If the Administrator finds that the applicable airworthiness 
regulations (i.e., 14 CFR part 25) do not contain adequate or 
appropriate safety standards for the Model EMB-550 airplane because of 
a novel or unusual design feature, special conditions are prescribed 
under the provisions of Sec.  21.16.
    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 or similar 
novel or unusual design feature, the special conditions would also 
apply to the other model under Sec.  21.101.
    In addition to the applicable airworthiness regulations and special 
conditions, the Model EMB-550 airplane 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 defined in 14 CFR 11.19, in 
accordance with Sec.  11.38, and they become part of the type-
certification basis under Sec.  21.17(a)(2).

Novel or Unusual Design Features

    The Model EMB-550 airplane will incorporate the following novel or 
unusual design features: The Embraer S.A. Model EMB-550 airplane will 
have a fly-by-wire electronic flight control system and no direct 
coupling from the flightdeck controller to the control surface. As a 
result, the pilot is not aware of the actual control surface position 
as envisioned when part 25 was written.


    These special conditions propose that the flightcrew receive a 
suitable flight control position annunciation when a flight condition 
exists in which nearly full surface authority (not crew-commanded) is 
being used. Suitability of such a display must take into account that 
some pilot-demanded maneuvers (e.g., rapid roll) are necessarily 
associated with intended full performance, which may saturate the 
surface. Therefore, simple alerting systems function in both intended 
and unexpected control-limiting situations. As a result, they must be 
properly balanced between providing necessary crew awareness and being 
a potential nuisance to the flightcrew. A monitoring system that 
compares airplane motion and surface deflection with the demand of the 
pilot sidestick controller could help reduce nuisance alerting.
    These special conditions also address flight control system mode 
annunciation. It proposes suitable mode annunciation be provided to the 
flightcrew for events that significantly change the operating mode of 
the system but do not merit the classic ``failure warning.''
    These special conditions establish a level of safety equivalent to 
that provided by a conventional flight control system and that 
contemplated in existing regulations.

Discussion of Comments

    Notice of proposed special conditions No. SC-12-25 for the Embraer 
S.A. EMB-550 airplanes was published in the Federal Register on 
September 27, 2012 (77 FR 57039). No comments were received, and the 
special conditions are adopted as proposed.


    As discussed above, these special conditions are applicable to the 
Model EMB-550 airplane. 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 of airplanes. It is not a rule of general applicability.

List of Subjects in 14 CFR Part 25

    Aircraft, Aviation safety, Reporting and recordkeeping 

The authority citation for these special conditions is as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701, 44702, 44704.

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 Model EMB-550 airplanes.
    1. Electronic Flight Control System: Control Surface Awareness and 
Mode Annunciation. In addition to the requirements of Sec. Sec.  
25.143, 25.671, and

[[Page 11554]]

25.672, the following requirements apply:
    a. The system design must ensure that the flightcrew is made 
suitably aware whenever the primary control means nears the limit of 
control authority.

    Note: The term ``suitably aware'' indicates annunciations 
provided to the flightcrew are appropriately balanced between 
nuisance and that necessary for crew awareness.

    b. If the design of the flight control system has multiple modes of 
operation, a means must be provided to indicate to the flightcrew any 
mode that significantly changes or degrades the normal handling or 
operational characteristics of the airplane.

    Issued in Renton, Washington, on February 12, 2013.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
[FR Doc. 2013-03656 Filed 2-15-13; 8:45 am]