Special Conditions: Bombardier Inc. BD-700-2A12 and BD-700-2A13 Airplane; Flight-Envelope Protection: General Limiting Requirements, 12252-12254 [2018-05662]

Download as PDF 12252 Federal Register / Vol. 83, No. 55 / Wednesday, March 21, 2018 / Rules and Regulations following novel or unusual design features: Fly-by-wire EFCS that will limit pitch and roll functions to prevent the airplane from attaining certain pitch attitudes and roll angles greater than plus or minus 65 degrees, and introduce positive spiral stability introduced for roll angles greater than 30 degrees at speeds below VMO/MMO. This system generates the actual surface commands that provide for stability augmentation and flight control for all three airplane axes (longitudinal, lateral, and directional). Discussion Part 25 of title 14 of the CFR does not specifically relate to flight characteristics associated with fixed attitude limits. Bombardier proposes to implement on the airplanes pitch and roll attitude-limiting functions via the EFCS normal mode. This will prevent the airplane from attaining certain pitch attitudes and roll angles greater than plus or minus 65 degrees. In addition, positive spiral stability, introduced for roll angles greater than 30 degrees at speeds below VMO/MMO, and spiral stability characteristics, must not require excessive pilot strength to achieve bank angles up to the bankangle limit. These special conditions are in addition to the requirements of § 25.143. 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 Model BD–700–2A12 and BD–700–2A13 airplanes. Should Bombardier 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. 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 Bombardier Model BD–700–2A12 and BD–700–2A13 series airplanes: In addition to § 25.143, the following requirements apply to the electronic flight-control system (EFCS) pitch- and roll-limiting functions: 1. The pitch-limiting function must not impede normal maneuvering for pitch angles up to the maximum required for normal maneuvering, including a normal, all-enginesoperating takeoff, plus a suitable margin to allow for satisfactory speed control. 2. The pitch- and roll-limiting functions must not restrict or prevent attaining pitch attitudes necessary for emergency maneuvering, or roll angles up to 65 degrees. Spiral stability, which is introduced above 30 degrees of roll angle, must not require excessive pilot strength to achieve these roll angles. Other protections, which further limit the roll capability under certain extreme angle-of-attack, attitude, or high-speed conditions, are acceptable, as long as they allow at least 45 degrees of roll capability. 3. A lower limit of roll is acceptable beyond the overspeed warning if it is possible to recover the airplane to the normal flight envelope without undue difficulty or delay. Issued in Des Moines, Washington. Victor Wicklund, Manager, Transport Standards Branch, Policy and Innovation Division, Aircraft Certification Service. [FR Doc. 2018–05651 Filed 3–20–18; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 25 [Docket No. FAA–2018–0228; Special Conditions No. 25–719–SC] This action affects only certain novel or unusual design features on one model series of airplanes. It is not a rule of general applicability. sradovich on DSK3GMQ082PROD with RULES Conclusion Special Conditions: Bombardier Inc. BD–700–2A12 and BD–700–2A13 Airplane; Flight-Envelope Protection: General Limiting Requirements List of Subjects in 14 CFR Part 25 AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final special conditions; request for comments. Aircraft, Aviation safety, Reporting and recordkeeping requirements. Authority Citation VerDate Sep<11>2014 16:29 Mar 20, 2018 These special conditions are issued for the Bombardier Inc. (Bombardier) Model BD–700–2A12 and SUMMARY: Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701, 44702, 44704. Jkt 244001 PO 00000 Frm 00006 Fmt 4700 Sfmt 4700 BD–700–2A13 airplanes. These airplanes will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards for transportcategory 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 Bombardier Inc. on March 21, 2018. Send your comments by May 7, 2018. ADDRESSES: Send comments identified by docket number FAA–2018–0228 using any of the following methods: • Federal eRegulations Portal: Go to https://www.regulations.gov/and follow the online instructions for sending your comments electronically. • 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. • 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. • Fax: Fax comments to Docket Operations at 202–493–2251. Privacy: The FAA will post all comments it receives, without change, to https://www.regulations.gov/, including any personal information the commenter provides. Using the search function of the docket website, anyone can find and read the electronic form of all comments received into any FAA docket, including the name of the individual sending the comment (or signing the comment for an association, business, labor union, etc.). DOT’s complete Privacy Act Statement can be found in the Federal Register published on April 11, 2000 (65 FR 19477–19478). Docket: Background documents or comments received may be read at https://www.regulations.gov/ 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. E:\FR\FM\21MRR1.SGM 21MRR1 Federal Register / Vol. 83, No. 55 / Wednesday, March 21, 2018 / Rules and Regulations Joe Jacobsen, FAA, Airplane and Flight Crew Interface Section, AIR–671, Transport Standards Branch, Policy and Innovation Division, Aircraft Certification Service, 2200 S. 216th St., Des Moines, Washington 98198–6547; telephone 206–231–3158; facsimile 425–231–3398. 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 has determined that prior public notice and comment are unnecessary, and finds that, for the same reason, good cause exists for adopting these special conditions upon publication in the Federal Register. FOR FURTHER INFORMATION CONTACT: 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 supporting data. We will consider all comments we receive by the closing date for comments. We may change these special conditions based on the comments we receive. sradovich on DSK3GMQ082PROD with RULES Background On May 30, 2012, Bombardier applied for an amendment to Type Certificate No. T00003NY to include the new BD– 700–2A12 and BD–700–2A13 airplanes. The Model BD–700–2A12 and BD–700– 2A13 airplanes, which are derivatives of the BD–700 series airplane currently approved under Type Certificate No. T00003NY. The Model BD–700–2A12 and BD–700–2A13 airplanes augment the existing BD–700 family of airplanes and are marketed as the Bombardier Global 7000 and Global 8000 airplanes, respectively. These are business jets with a maximum certified passenger capacity of 19. The Model BD–700– 2A12 and BD–700–2A13 airplanes will have a maximum takeoff weight of 106,250 lbs. and 104,800 lbs., respectively. Type Certification Basis Under the provisions of title 14, Code of Federal Regulations (14 CFR) 21.101, Bombardier must show that the Model BD–700–2A12 and BD–700–2A13 airplanes meet the applicable provisions of the regulations listed in Type Certificate No. T00003NY or the applicable regulations in effect on the date of application for the change except VerDate Sep<11>2014 16:29 Mar 20, 2018 Jkt 244001 for earlier amendments as agreed upon by the FAA. 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 BD–700–2A12 and BD– 700–2A13 airplanes because of a novel or unusual design feature, special conditions are prescribed under the provisions of § 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, or should any other model already included on the same type certificate be modified to incorporate the same novel or unusual design feature, these special conditions would also apply to the other model under § 21.101. In addition to the applicable airworthiness regulations and special conditions, the Model BD–700–2A12 and BD–700–2A13 airplanes must comply with the fuel-vent and exhaustemission 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 § 11.38, and they become part of the type certification basis under § 21.101. Novel or Unusual Design Features The Bombardier Model BD–700–2A12 and BD–700–2A13 airplanes will incorporate the following novel or unusual design feature: New control architecture and a full digital-flightcontrol system that provides comprehensive flight-envelope protections. Discussion The applicable airworthiness regulation is 14 CFR 25.143. The purpose of § 25.143 is to verify that any operational maneuvers conducted within the operational envelope can be accomplished smoothly with average piloting skill and without exceeding any 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 § 25.143 primarily through qualitative methods. During flight test, the pilot should evaluate all of the following: • The interface between each protection function; • Transitions from one mode to another; PO 00000 Frm 00007 Fmt 4700 Sfmt 4700 12253 • Airplane response to intentional dynamic maneuvering, whenever applicable, through dedicated maneuvers; • General controllability assessment; • High speed characteristics; and • High angle-of-attack. Section 25.143, however, does not adequately ensure that the novel or unusual features of the BD–700 series airplanes will have a level of safety equivalent to that of existing standards. These special conditions are therefore required to accommodate the flight envelope limiting systems in the BD– 700 series airplanes. 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. The additional safety standards in these special conditions will ensure a level of safety equivalent to that of existing standards. Applicability As discussed above, these special conditions are applicable to the Bombardier Model BD–700–2A12 and BD–700–2A13 airplanes. Should Bombardier 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. Conclusion This action affects only certain novel or unusual design features on Bombardier Model BD–700–2A12 and BD–700–2A13 airplanes. It is not a rule of general applicability. List of Subjects in 14 CFR Part 25 Aircraft, Aviation safety, Reporting and recordkeeping requirements. 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 Bombardier Model BD–700–2A12 and BD–700–2A13 airplanes. General Limiting Requirements a. Onset characteristics of each envelope protection feature must be E:\FR\FM\21MRR1.SGM 21MRR1 12254 Federal Register / Vol. 83, No. 55 / Wednesday, March 21, 2018 / Rules and Regulations 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: i. Airplane structural limits, ii. Required safe and controllable maneuvering of the airplane, and iii. 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 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 electronic flight-control system not shown to be extremely improbable. Issued in Des Moines, Washington, on March 15, 2018. Victor Wicklund, Manager, Transport Standards Branch, Policy and Innovation Division, Aircraft Certification Service. [FR Doc. 2018–05662 Filed 3–20–18; 8:45 am] BILLING CODE 4910–13–P CONSUMER PRODUCT SAFETY COMMISSION sradovich on DSK3GMQ082PROD with RULES 16 CFR Chapter II [Docket No. CPSC–2016–2019] Labeling of Certain Household Products Containing Methylene Chloride; Supplemental Guidance Consumer Product Safety Commission. AGENCY: VerDate Sep<11>2014 16:29 Mar 20, 2018 Jkt 244001 ACTION: Guidance. The Halogenated Solvents Industry Alliance petitioned the Consumer Product Safety Commission to amend its 1987 policy statement regarding the labeling of certain products containing methylene chloride to address acute hazards from inhaling methylene chloride vapors in addition to the chronic hazards addressed in the policy statement. In this document, the Commission updates the 1987 policy statement to provide guidance regarding the labeling to warn of acute hazards associated with paint strippers containing methylene chloride. DATES: This guidance document becomes applicable on March 21, 2018. FOR FURTHER INFORMATION CONTACT: Carol Afflerbach, Office of Compliance and Field Operations, U.S. Consumer Product Safety Commission; 4330 EastWest Highway, Bethesda, MD 20814; email: cafflerbach@cpsc.gov; telephone: (301) 504–7529. SUPPLEMENTARY INFORMATION: SUMMARY: I. Background In 1987, the U.S. Consumer Product Safety Commission (CPSC or Commission) issued a Statement of Interpretation and Enforcement Policy regarding the labeling of certain household products containing methylene chloride (1987 Statement), 52 FR 34698 (Sept. 14, 1987). The 1987 Statement noted that the Commission considers certain household products containing methylene chloride (DCM) to be ‘‘hazardous substances’’ under the FHSA and may pose a risk of carcinogenicity. The 1987 Statement identified several categories of products that contained methylene chloride that could expose consumers to significant amounts of methylene chloride vapor, and were thus hazardous substances. Paint strippers were one of these product categories. The 1987 Statement advised manufacturers of the FHSA’s labeling requirements and provided guidance for labeling those products, including paint strippers, to warn of the cancer risk from inhaling methylene chloride vapor. On July 7, 2016, the Halogenated Solvents Industry Alliance (HSIA or petitioner) petitioned the CPSC to amend its 1987 Statement to recognize the acute hazard posed by using household products containing DCM in enclosed spaces with inadequate ventilation. The petitioner stated that using household products containing DCM in bathrooms, or other enclosed spaces, with inadequate ventilation can be dangerous. When consumers use PO 00000 Frm 00008 Fmt 4700 Sfmt 4700 methylene chloride to strip coatings from bathtubs, they often spray or pour a bathtub stripping product into the basin of the bathtub and then brush the product onto the tub surface. Many of these stripping products contain substantial amounts of methylene chloride. According to the petitioner, methylene chloride is a volatile organic compound that will evaporate quickly when sprayed, brushed, or poured, so that its vapor can quickly build up in small spaces. The petitioner stated that DCM has a high vapor pressure, which causes vapors to collect in the bottom of a bathtub and in a consumer’s breathing zone when working in a bathtub. This situation can create dangerously high concentrations of DCM, and in some cases, replace the breathable air. The petitioner asked the Commission to expand the cautionary labeling guidance so that it also warns of the threat of asphyxiation if DCM-based paint strippers are used in an enclosed space. CPSC staff prepared a briefing package in response to the petition and submitted the package to the Commission on May 26, 2017. On June 2, 2017, the Commission voted unanimously (5–0) to grant the petition (HP 16–1) and directed CPSC staff to draft a policy statement that addresses labeling for acute hazards from inhaling methylene chloride vapors from paint strippers. II. EPA Rulemaking The EPA has initiated rulemaking under section 6(a) of the Toxic Substances Control Act (TSCA) to address risks posed by DCM when used in paint and coating removal products. Specifically, EPA has issued a proposed rule that provides an assessment of the health hazards posed by DCM and that proposes to determine that DCM in these products presents an unreasonable risk of injury to health. Based on this determination, and after considering regulatory alternatives, EPA proposed to prohibit the manufacture (including import), processing, and distribution in commerce of DCM for all consumer and most commercial paint removal products, and to prohibit commercial use. 82 FR 7464 (Jan. 19, 2017). EPA’s rulemaking would address both consumer and worker exposures to DCM used for paint and coating removal. While developing its rulemaking, EPA consulted with CPSC staff. Under EPA’s rulemaking (if finalized as proposed), paint and coating removal products containing DCM would no longer be on the market for consumers or commercial workers, except in limited circumstances. To date, EPA has not finalized its rulemaking. Accordingly, E:\FR\FM\21MRR1.SGM 21MRR1

Agencies

[Federal Register Volume 83, Number 55 (Wednesday, March 21, 2018)]
[Rules and Regulations]
[Pages 12252-12254]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2018-05662]

-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. FAA-2018-0228; Special Conditions No. 25-719-SC]

Special Conditions: Bombardier Inc. BD-700-2A12 and BD-700-2A13
Airplane; Flight-Envelope Protection: General Limiting Requirements

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions; request for comments.

-----------------------------------------------------------------------

SUMMARY: These special conditions are issued for the Bombardier Inc.
(Bombardier) Model BD-700-2A12 and BD-700-2A13 airplanes. These
airplanes 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 Bombardier Inc. on March 21, 2018.
Send your comments by May 7, 2018.

ADDRESSES: Send comments identified by docket number FAA-2018-0228
using any of the following methods:
Federal eRegulations Portal: Go to https://www.regulations.gov/and follow the online instructions for sending your
comments electronically.
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.
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.
Fax: Fax comments to Docket Operations at 202-493-2251.
Privacy: The FAA will post all comments it receives, without
change, to https://www.regulations.gov/, including any personal
information the commenter provides. Using the search function of the
docket website, anyone can find and read the electronic form of all
comments received into any FAA docket, including the name of the
individual sending the comment (or signing the comment for an
association, business, labor union, etc.). DOT's complete Privacy Act
Statement can be found in the Federal Register published on April 11,
2000 (65 FR 19477-19478).
Docket: Background documents or comments received may be read at
https://www.regulations.gov/ 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.

[[Page 12253]]

FOR FURTHER INFORMATION CONTACT: Joe Jacobsen, FAA, Airplane and Flight
Crew Interface Section, AIR-671, Transport Standards Branch, Policy and
Innovation Division, Aircraft Certification Service, 2200 S. 216th St.,
Des Moines, Washington 98198-6547; telephone 206-231-3158; facsimile
425-231-3398.

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 has determined that prior public notice and comment
are unnecessary, and finds that, for the same reason, good cause exists
for adopting these special conditions upon publication in the Federal
Register.

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 supporting data.
We will consider all comments we receive by the closing date for
comments. We may change these special conditions based on the comments
we receive.

Background

On May 30, 2012, Bombardier applied for an amendment to Type
Certificate No. T00003NY to include the new BD-700-2A12 and BD-700-2A13
airplanes. The Model BD-700-2A12 and BD-700-2A13 airplanes, which are
derivatives of the BD-700 series airplane currently approved under Type
Certificate No. T00003NY. The Model BD-700-2A12 and BD-700-2A13
airplanes augment the existing BD-700 family of airplanes and are
marketed as the Bombardier Global 7000 and Global 8000 airplanes,
respectively. These are business jets with a maximum certified
passenger capacity of 19. The Model BD-700-2A12 and BD-700-2A13
airplanes will have a maximum takeoff weight of 106,250 lbs. and
104,800 lbs., respectively.

Type Certification Basis

Under the provisions of title 14, Code of Federal Regulations (14
CFR) 21.101, Bombardier must show that the Model BD-700-2A12 and BD-
700-2A13 airplanes meet the applicable provisions of the regulations
listed in Type Certificate No. T00003NY or the applicable regulations
in effect on the date of application for the change except for earlier
amendments as agreed upon by the FAA.
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 BD-700-2A12 and BD-700-2A13
airplanes 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, or should any other model already included on
the same type certificate be modified to incorporate 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 Model BD-700-2A12 and BD-700-2A13 airplanes 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. 21.101.

Novel or Unusual Design Features

The Bombardier Model BD-700-2A12 and BD-700-2A13 airplanes will
incorporate the following novel or unusual design feature: New control
architecture and a full digital-flight-control system that provides
comprehensive flight-envelope protections.

Discussion

The applicable airworthiness regulation is 14 CFR 25.143. The
purpose of Sec. [thinsp]25.143 is to verify that any operational
maneuvers conducted within the operational envelope can be accomplished
smoothly with average piloting skill and without exceeding any
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. [thinsp]25.143
primarily through qualitative methods. During flight test, the pilot
should evaluate all of the following:
The interface between each protection function;
Transitions from one mode to another;
Airplane response to intentional dynamic maneuvering,
whenever applicable, through dedicated maneuvers;
General controllability assessment;
High speed characteristics; and
High angle-of-attack.
Section 25.143, however, does not adequately ensure that the novel
or unusual features of the BD-700 series airplanes will have a level of
safety equivalent to that of existing standards. These special
conditions are therefore required to accommodate the flight envelope
limiting systems in the BD-700 series airplanes. 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. The additional safety standards in these special conditions
will ensure a level of safety equivalent to that of existing standards.

Applicability

As discussed above, these special conditions are applicable to the
Bombardier Model BD-700-2A12 and BD-700-2A13 airplanes. Should
Bombardier 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.

Conclusion

This action affects only certain novel or unusual design features
on Bombardier Model BD-700-2A12 and BD-700-2A13 airplanes. It is not a
rule of general applicability.

List of Subjects in 14 CFR Part 25

Aircraft, Aviation safety, Reporting and recordkeeping
requirements.

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 Bombardier Model BD-700-2A12 and BD-
700-2A13 airplanes.

General Limiting Requirements

a. Onset characteristics of each envelope protection feature must
be

[[Page 12254]]

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:
i. Airplane structural limits,
ii. Required safe and controllable maneuvering of the airplane, and
iii. Margins to critical conditions. Unsafe flight characteristics/
conditions must not result if dynamic maneuvering, airframe and system
tolerances (both manufacturing and in-service), 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 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 electronic flight-control system not shown to be
extremely improbable.

Issued in Des Moines, Washington, on March 15, 2018.
Victor Wicklund,
Manager, Transport Standards Branch, Policy and Innovation Division,
Aircraft Certification Service.
[FR Doc. 2018-05662 Filed 3-20-18; 8:45 am]
BILLING CODE 4910-13-P

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