Rule2022-03025
Special Conditions: Dassault Aviation Model Falcon 6X Airplane; Flight-Envelope Protection: General Limiting Requirements
Primary source
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Published
February 14, 2022
Effective
February 14, 2022
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
These special conditions are issued for the Dassault Aviation (Dassault) Model Falcon 6X airplane. This airplane will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes. This design feature is a new control architecture and a full digital flight control system that provides comprehensive flight- envelope protections. 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.
Full Text
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<title>Federal Register, Volume 87 Issue 30 (Monday, February 14, 2022)</title>
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[Federal Register Volume 87, Number 30 (Monday, February 14, 2022)]
[Rules and Regulations]
[Pages 8143-8145]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-03025]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. FAA-2021-0628; Special Conditions No. 25-802-SC]
Special Conditions: Dassault Aviation Model Falcon 6X Airplane;
Flight-Envelope Protection: General Limiting Requirements
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Final special conditions; request for comments.
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SUMMARY: These special conditions are issued for the Dassault Aviation
(Dassault) Model Falcon 6X airplane. This airplane will have a novel or
unusual design feature when compared to the state of technology
envisioned in the airworthiness standards for transport category
airplanes. This design feature is a new control architecture and a full
digital flight control system that provides comprehensive flight-
envelope protections. 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: This action is effective on Dassault on February 14, 2022. Send
comments on or before March 31, 2022.
ADDRESSES: Send comments identified by Docket No. FAA-2021-0628 using
any of the following methods:
<bullet> Federal eRegulations Portal: Go to <a href="https://www.regulations.gov/">https://www.regulations.gov/</a> and follow the online instructions for sending
your comments electronically.
<bullet> Mail: Send comments to Docket Operations, M-30, U.S.
Department of Transportation (DOT), 1200 New Jersey Avenue SE, Room
W12-140, West Building Ground Floor, Washington, DC 20590-0001.
<bullet> Hand Delivery or Courier: Take comments to Docket
Operations in Room W12-140 of the West Building Ground Floor at 1200
New Jersey Avenue SE, Washington, DC, between 9 a.m. and 5 p.m., Monday
through Friday, except Federal holidays.
<bullet> Fax: Fax comments to Docket Operations at 202-493-2251.
Privacy: Except for Confidential Business Information (CBI) as
described in the following paragraph, and other information as
described in title 14, Code of Federal Regulations (14 CFR)
[[Page 8144]]
11.35, the FAA will post all comments received without change to
<a href="https://www.regulations.gov/">https://www.regulations.gov/</a>, including any personal information you
provide. The FAA will also post a report summarizing each substantive
verbal contact received about these special conditions.
Confidential Business Information: Confidential Business
Information (CBI) is commercial or financial information that is both
customarily and actually treated as private by its owner. Under the
Freedom of Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from
public disclosure. If your comments responsive to these special
conditions contain commercial or financial information that is
customarily treated as private, that you actually treat as private, and
that is relevant or responsive to these special conditions, it is
important that you clearly designate the submitted comments as CBI.
Please mark each page of your submission containing CBI as ``PROPIN.''
The FAA will treat such marked submissions as confidential under the
FOIA, and the indicated comments will not be placed in the public
docket of these special conditions. Send submissions containing CBI to
the Information Contact below. Comments the FAA receives, which are not
specifically designated as CBI, will be placed in the public docket for
these special conditions.
Docket: Background documents or comments received may be read at
<a href="https://www.regulations.gov/">https://www.regulations.gov/</a> at any time. Follow the online
instructions for accessing the docket or go to Docket Operations in
Room W12-140 of the West Building Ground Floor at 1200 New Jersey
Avenue SE, Washington, DC, between 9 a.m. and 5 p.m., Monday through
Friday, except Federal holidays.
FOR FURTHER INFORMATION CONTACT: Troy Brown, Performance and
Environment Section, AIR-625, Technical Innovation Policy Branch,
Policy and Innovation Division, Aircraft Certification Service, Federal
Aviation Administration, 1801 S Airport Rd., Wichita, KS 67209-2190;
telephone and fax 405-666-1050; email <a href="/cdn-cgi/l/email-protection#b7c3c5d8ce99d699d5c5d8c0d9f7d1d6d699d0d8c1"><span class="__cf_email__" data-cfemail="aaded8c5d384cb84c8d8c5ddc4eacccbcb84cdc5dc">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION: The substance of these special conditions
has been published in the Federal Register for public comment in
several prior instances with no substantive comments received.
Therefore, the FAA finds, pursuant to Sec. 11.38(b), that new comments
are unlikely, and notice and comment prior to this publication are
unnecessary.
Comments Invited
The FAA invites 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 supporting data.
The FAA will consider all comments received by the closing date for
comments. The FAA may change these special conditions based on the
comments received.
Background
On July 1, 2012, Dassault applied for a type certificate for its
new Model Falcon 5X airplane. However, Dassault has decided not to
release an airplane under the model designation Falcon 5X, instead
choosing to change that model designation to Falcon 6X.
In February of 2018, due to engine supplier issues, Dassault
extended the type certificate application date for its Model Falcon 5X
airplane under new Model Falcon 6X. This airplane is a twin-engine
business jet with seating for 19 passengers, and has a maximum takeoff
weight of 77,460 pounds.
Type Certification Basis
Under the provisions of 14 CFR 21.17, Dassault must show that the
Model Falcon 6X airplane meets the applicable provisions of part 25, as
amended by amendments 25-1 through 25-146.
If the Administrator finds that the applicable airworthiness
regulations (e.g., 14 CFR part 25) do not contain adequate or
appropriate safety standards for the Dassault Model Falcon 6X 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 novel or
unusual design feature, these special conditions would also apply to
the other model under Sec. 21.101.
In addition to the applicable airworthiness regulations and special
conditions, the Dassault Model Falcon 6X 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.
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 Dassault Model Falcon 6X airplane will incorporate the
following novel or unusual design features:
New control architecture and a full digital flight control system
that provides comprehensive flight-envelope protections.
Discussion
The applicable airworthiness regulation is Sec. 25.143. The
purpose of Sec. 25.143 is to verify that operational maneuvers
conducted within the operational envelope can be accomplished smoothly
with average piloting skill and without exceeding structural limits.
The pilot should be able to predict the airplane response to any
control input. During the course of the flight-test program, the pilot
determines compliance with Sec. 25.143 primarily through qualitative
methods. During flight test, the pilot should evaluate all of the
following:
<bullet> The interface between each protection function;
<bullet> Transitions from one mode to another;
<bullet> Airplane response to intentional dynamic maneuvering,
whenever applicable, through dedicated maneuvers;
<bullet> General controllability assessment;
<bullet> High-speed characteristics; and
<bullet> High angle-of-attack.
However, the regulations do not adequately ensure that the novel or
unusual features of the electronic flight control system will have a
level of safety equivalent to that of existing standards. The general
limiting requirements are necessary to ensure a smooth transition from
normal flight to the protection mode and adequate maneuver capability.
The general limiting requirements also ensure that the structural
limits of the airplane are not exceeded. Furthermore, failure of the
flight-envelope protection feature must not create hazardous flight
conditions.
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.
Applicability
As discussed above, these special conditions are applicable to the
Dassault Model Falcon 6X airplane. Should Dassault apply at a later
date for a change to the type certificate to include another model
incorporating the same novel or unusual design feature, these special
conditions would apply to that model as well.
[[Page 8145]]
Conclusion
This action affects only a certain novel or unusual design feature
on one model of airplane. It is not a rule of general applicability.
List of Subjects in 14 CFR Part 25
Aircraft, Aviation safety, Reporting and recordkeeping
requirements.
Authority Citation
The authority citation for these special conditions is as follows:
Authority: 49 U.S.C. 106(f), 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 Dassault Aviation Model Falcon 6X
airplanes.
General Limiting Requirements
a. Onset characteristics of each flight-envelope protection feature
must be smooth, appropriate to the phase of flight and type of
maneuver, and not in conflict with the ability of the pilot to
satisfactorily change airplane flight path, speed, or attitude as
needed.
b. Limit values of protected flight parameters (and, if applicable,
associated warning thresholds) must be compatible with the following:
1. Airplane structural limits,
2. Required safe and controllable maneuvering of the airplane, and
3. Margins to critical conditions. Unsafe flight characteristics/
conditions must not result if dynamic maneuvering, airframe, and system
tolerances (both manufacturing and inservice), and non-steady
atmospheric conditions, in any appropriate combination and phase of
flight, can produce a limited flight parameter beyond the nominal
design limit value.
c. The airplane must be responsive to intentional dynamic
maneuvering to within a suitable range of the parameter limit. Dynamic
characteristics such as damping and overshoot must also be appropriate
for the flight-maneuver and limit parameter in question.
d. When simultaneous envelope limiting is engaged, adverse coupling
or adverse priority must not result.
Failure States
a. Electronic flight-control system (EFCS) failures, including
sensors, must not result in a condition where a parameter is limited to
such a reduced value that safe and controllable maneuvering is no
longer available.
b. The crew must be alerted by suitable means if any change in
envelope limiting or maneuverability is produced by single or multiple
failures of the EFCS not shown to be extremely improbable.
Issued in Kansas City, Missouri, on February 8, 2022.
Patrick R. Mullen,
Manager, Technical Innovation Policy Branch, Policy and Innovation
Division, Aircraft Certification Service.
[FR Doc. 2022-03025 Filed 2-11-22; 8:45 am]
BILLING CODE 4910-13-P
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