Special Conditions: Embraer S.A., Model ERJ 190-300 Series Airplanes; Design Roll Maneuver for Electronic Flight Controls, 36326-36328 [2017-16417]
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36326
Federal Register / Vol. 82, No. 149 / Friday, August 4, 2017 / Rules and Regulations
must be limited to components that are
not readily detectable by normal
detection-and-indication systems, and
where service history shows that
inspections will provide an adequate
level of safety.
b. The existence of any failure
condition, not extremely improbable,
during flight, that could significantly
affect the structural capability of the
airplane, and for which the associated
reduction in airworthiness can be
minimized by suitable flight limitations,
must be signaled to the flightcrew. For
example, failure conditions that result
in a factor of safety between the airplane
strength and the loads of part 25,
subpart C below 1.25, or flutter margins
below V″, must be signaled to the crew
during flight.
5. Dispatch with known failure
conditions. If the airplane is to be
dispatched in a known system-failure
condition that affects structural
performance, or that affects the
reliability of the remaining system to
maintain structural performance, then
the provisions of these special
conditions must be met, including the
provisions of special condition 2 for the
dispatched condition, and special
condition 3 for subsequent failures.
Expected operational limitations may be
taken into account in establishing Pj as
the probability of failure occurrence for
determining the safety margin in Figure
1. Flight limitations and expected
operational limitations may be taken
into account in establishing Qj as the
combined probability of being in the
dispatched failure condition and the
subsequent failure condition for the
safety margins in Figures 2 and 3. These
limitations must be such that the
probability of being in this combined
failure state, and then subsequently
encountering limit load conditions, is
extremely improbable. No reduction in
these safety margins is allowed if the
subsequent system-failure rate is greater
than 10¥3 per flight hour.
Issued in Renton, Washington.
Victor Wicklund,
Manager, Transport Standards Branch,
Aircraft Certification Service.
[FR Doc. 2017–16416 Filed 8–3–17; 8:45 am]
BILLING CODE 4910–13–P
VerDate Sep<11>2014
13:21 Aug 03, 2017
Jkt 241001
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. FAA–2017–0732; Special
Conditions No. 25–697–SC]
Special Conditions: Embraer S.A.,
Model ERJ 190–300 Series Airplanes;
Design Roll Maneuver for Electronic
Flight Controls
Federal Aviation
Administration (FAA), DOT.
ACTION: Final special conditions; request
for comments.
AGENCY:
These special conditions are
issued for the Embraer S.A. (Embraer)
Model ERJ 190–300 series 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 an electronic flight control
system (EFCS) that provides control of
the airplane through pilot inputs to the
flight computer. 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
Embraer on August 4, 2017. We must
receive your comments by September
18, 2017.
ADDRESSES: Send comments identified
by docket number FAA–2017–0732
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
SUMMARY:
PO 00000
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Fmt 4700
Sfmt 4700
function of the docket Web site, 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.
FOR FURTHER INFORMATION CONTACT: Greg
Schneider, FAA, Airframe and Cabin
Safety Branch, ANM–115, Transport
Airplane Directorate, Aircraft
Certification Service, 1601 Lind Avenue
SW., Renton, Washington, 98057–3356;
telephone 425–227–2116; facsimile
425–227–1320.
SUPPLEMENTARY INFORMATION: The FAA
has determined that notice of, and
opportunity for prior public comment
on, these special conditions is
impracticable because these procedures
would delay issuance of the design
approval and thus delivery of the
affected airplane.
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 finds it is
unnecessary to delay the effective date
and finds that good cause exists for
adopting these special conditions upon
publication in the Federal Register.
Comments Invited
The FAA is requesting comments to
allow interested persons to submit
views that may not have been submitted
in response to the prior opportunities
for comment described above. 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 September 13, 2013, Embraer
applied for an amendment to Type
E:\FR\FM\04AUR1.SGM
04AUR1
Federal Register / Vol. 82, No. 149 / Friday, August 4, 2017 / Rules and Regulations
Certificate (TC) no. A57NM to include
the new Model ERJ 190–300 airplanes.
The Model ERJ 190–300 airplane, which
is a derivative of the Model ERJ 190–100
STD airplane currently approved under
TC no. A57NM, is a 97–114 passenger
transport-category airplane with two
Pratt & Whitney Model PW1900G
engines, a new wing design with a high
aspect ratio and raked wingtip, and a
digital fly-by-wire electronic flightcontrol system.
The flight-control system for the
Model ERJ 190–300 airplane does not
have a direct mechanical link nor a
linear gain between the airplane flightcontrol surface and the pilot’s flightdeck control device, which is not
accounted for in title 14, Code of
Federal Regulations (14 CFR) 25.349(a).
Instead, a flight-control computer
commands the airplane flight-control
surfaces, based on input received from
the flight-deck control device. The
flight-control computer modifies pilot
input before the command is given to
the flight-control surface.
Type Certification Basis
Under the provisions of 14 CFR
21.101, Embraer must show that the
Model ERJ 190–300 airplane meets the
applicable provisions of the regulations
listed in Type Certificate No. A57NM 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 ERJ 190–300 airplane
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 features, 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 ERJ 190–300 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
VerDate Sep<11>2014
13:21 Aug 03, 2017
Jkt 241001
with § 11.38, and they become part of
the type certification basis under
§ 21.101.
Novel or Unusual Design Features
The ERJ 190–300 will incorporate the
following novel or unusual design
features: An electronic flight control
system that provides control of the
airplane through pilot inputs to the
flight computer. Current part 25
airworthiness regulations account for
control laws where aileron deflection is
proportional to control stick deflection.
They do not address any nonlinearities,
i.e., situations where output does not
change in the same proportion as input,
or other effects on aileron actuation that
may be caused by electronic flight
controls.
Discussion
These special conditions differ from
current regulatory requirements in that
they require that the roll maneuver
result from defined movements of the
cockpit roll control as opposed to
defined aileron deflections. Also, these
special conditions require an additional
load condition at design maneuvering
speed (VA), in which the cockpit roll
control is returned to neutral following
the initial roll input.
These special conditions differ from
similar special conditions previously
issued on this topic. These special
conditions are limited to the roll axis
only, whereas other special conditions
also included pitch and yaw axes.
Special conditions are no longer needed
for the yaw axis because 14 CFR 25.351
was revised at Amendment 25–91 to
take into account effects of an electronic
flight control system. No special
conditions are needed for the pitch axis
because the method that Embraer
proposed for the pitch maneuver takes
into account effects of an electronic
flight control system.
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
ERJ 190–300 airplanes. Should Embraer
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.
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Fmt 4700
Sfmt 4700
36327
Conclusion
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 requirements.
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 the Embraer
Model ERJ 190–300 series airplanes.
In lieu of compliance to 14 CFR
25.349(a), the Embraer Model ERJ 190–
300 airplane must comply with the
following:
The following conditions, speeds, and
cockpit roll control motions (except as
the motions may be limited by pilot
effort) must be considered in
combination with an airplane load
factor of zero and of two-thirds of the
positive maneuvering factor used in
design. In determining the resulting
control surface deflections, the torsional
flexibility of the wing must be
considered in accordance with 14 CFR
25.301(b).
(a) Conditions corresponding to
steady rolling velocities must be
investigated. In addition, conditions
corresponding to maximum angular
acceleration must be investigated for
airplanes with engines or other weight
concentrations outboard of the fuselage.
For the angular acceleration conditions,
zero rolling velocity may be assumed in
the absence of a rational time history
investigation of the maneuver.
(b) At VA, sudden movement of the
cockpit roll control up to the limit is
assumed. The position of the cockpit
roll control must be maintained until a
steady roll rate is achieved and then
must be returned suddenly to the
neutral position.
(c) At VC, the cockpit roll control
must be moved suddenly and
maintained so as to achieve a roll rate
not less than that obtained in paragraph
(b).
(d) At VD, the cockpit roll control
must be moved suddenly and
maintained so as to achieve a roll rate
not less than one third of that obtained
in paragraph (b).
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04AUR1
36328
Federal Register / Vol. 82, No. 149 / Friday, August 4, 2017 / Rules and Regulations
Issued in Renton, Washington.
Victor Wicklund,
Manager, Transport Standards Branch,
Aircraft Certification Service.
[FR Doc. 2017–16417 Filed 8–3–17; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. FAA–2017–0318; Special
Conditions No. 25–693–SC]
Special Conditions: Embraer S.A.
Model ERJ 190–300 Airplane;
Interaction of Systems and Structures
Federal Aviation
Administration (FAA), DOT.
ACTION: Final special conditions; request
for comments.
AGENCY:
These special conditions are
issued for the Embraer S.A. (Embraer)
Model ERJ 190–300 airplane. This
airplane will have novel or unusual
design features when compared to the
state of technology envisioned in the
airworthiness standards for transportcategory airplanes. These design
features include systems that, directly or
as a result of failure or malfunction,
affect airplane structural performance.
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
Embraer on August 4, 2017. Send your
comments by September 18, 2017.
ADDRESSES: Send comments identified
by docket number FAA–2017–0318
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.
SUMMARY:
VerDate Sep<11>2014
13:21 Aug 03, 2017
Jkt 241001
• 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 Web site, 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.
FOR FURTHER INFORMATION CONTACT: Greg
Schneider, FAA, Airframe and Cabin
Safety Branch, ANM–115, Transport
Airplane Directorate, Aircraft
Certification Service, 1601 Lind Avenue
SW., Renton, Washington 98057–3356;
telephone 425–227–2116; facsimile
425–227–1320.
SUPPLEMENTARY INFORMATION: The FAA
has determined that notice of, and
opportunity for prior public comment
on, these special conditions is
impracticable because these procedures
would significantly delay issuance of
the design approval and thus delivery of
the affected airplanes.
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 it unnecessary to delay the
effective date and that good cause exists
for making these special conditions
effective 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.
PO 00000
Frm 00010
Fmt 4700
Sfmt 4700
Background
On September 13, 2013, Embraer
applied for an amendment to Type
Certificate No. A57NM to include the
new Model ERJ 190–300 airplane. The
Model ERJ 190–300 airplane, which is a
derivative of the Embraer Model ERJ
190–100 STD airplane currently
approved under Type Certificate No.
A57NM, is a 97- to 114-passenger
transport-category airplane. The
maximum take-off weight is 124,340 lbs
(56,400 kg).
Type Certification Basis
Under the provisions of Title 14, Code
of Federal Regulations (14 CFR) 21.101,
Embraer must show that the Model ERJ
190–300 airplane meets the applicable
provisions of the regulations listed in
Type Certificate No. A57NM, 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 ERJ 190–300 airplane
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 ERJ 190–300
airplane must comply with the fuel-vent
and exhaust-emission requirements of
14 CFR part 34 and the noisecertification 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 Embraer Model ERJ 190–300
airplane will incorporate the following
novel or unusual design feature:
Systems that, directly or as a result of
failure or malfunction, affect airplane
structural performance. That is, the
E:\FR\FM\04AUR1.SGM
04AUR1
Agencies
[Federal Register Volume 82, Number 149 (Friday, August 4, 2017)]
[Rules and Regulations]
[Pages 36326-36328]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-16417]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. FAA-2017-0732; Special Conditions No. 25-697-SC]
Special Conditions: Embraer S.A., Model ERJ 190-300 Series
Airplanes; Design Roll Maneuver for Electronic Flight Controls
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final special conditions; request for comments.
-----------------------------------------------------------------------
SUMMARY: These special conditions are issued for the Embraer S.A.
(Embraer) Model ERJ 190-300 series 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 an electronic flight control
system (EFCS) that provides control of the airplane through pilot
inputs to the flight computer. 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 Embraer on August 4, 2017. We must
receive your comments by September 18, 2017.
ADDRESSES: Send comments identified by docket number FAA-2017-0732
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 Web site, 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.
FOR FURTHER INFORMATION CONTACT: Greg Schneider, FAA, Airframe and
Cabin Safety Branch, ANM-115, Transport Airplane Directorate, Aircraft
Certification Service, 1601 Lind Avenue SW., Renton, Washington, 98057-
3356; telephone 425-227-2116; facsimile 425-227-1320.
SUPPLEMENTARY INFORMATION: The FAA has determined that notice of, and
opportunity for prior public comment on, these special conditions is
impracticable because these procedures would delay issuance of the
design approval and thus delivery of the affected airplane.
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 finds it is unnecessary to
delay the effective date and finds that good cause exists for adopting
these special conditions upon publication in the Federal Register.
Comments Invited
The FAA is requesting comments to allow interested persons to
submit views that may not have been submitted in response to the prior
opportunities for comment described above. 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 September 13, 2013, Embraer applied for an amendment to Type
[[Page 36327]]
Certificate (TC) no. A57NM to include the new Model ERJ 190-300
airplanes. The Model ERJ 190-300 airplane, which is a derivative of the
Model ERJ 190-100 STD airplane currently approved under TC no. A57NM,
is a 97-114 passenger transport-category airplane with two Pratt &
Whitney Model PW1900G engines, a new wing design with a high aspect
ratio and raked wingtip, and a digital fly-by-wire electronic flight-
control system.
The flight-control system for the Model ERJ 190-300 airplane does
not have a direct mechanical link nor a linear gain between the
airplane flight-control surface and the pilot's flight-deck control
device, which is not accounted for in title 14, Code of Federal
Regulations (14 CFR) 25.349(a). Instead, a flight-control computer
commands the airplane flight-control surfaces, based on input received
from the flight-deck control device. The flight-control computer
modifies pilot input before the command is given to the flight-control
surface.
Type Certification Basis
Under the provisions of 14 CFR 21.101, Embraer must show that the
Model ERJ 190-300 airplane meets the applicable provisions of the
regulations listed in Type Certificate No. A57NM 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 ERJ 190-300 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 features, 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 ERJ 190-300 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 ERJ 190-300 will incorporate the following novel or unusual
design features: An electronic flight control system that provides
control of the airplane through pilot inputs to the flight computer.
Current part 25 airworthiness regulations account for control laws
where aileron deflection is proportional to control stick deflection.
They do not address any nonlinearities, i.e., situations where output
does not change in the same proportion as input, or other effects on
aileron actuation that may be caused by electronic flight controls.
Discussion
These special conditions differ from current regulatory
requirements in that they require that the roll maneuver result from
defined movements of the cockpit roll control as opposed to defined
aileron deflections. Also, these special conditions require an
additional load condition at design maneuvering speed (VA),
in which the cockpit roll control is returned to neutral following the
initial roll input.
These special conditions differ from similar special conditions
previously issued on this topic. These special conditions are limited
to the roll axis only, whereas other special conditions also included
pitch and yaw axes. Special conditions are no longer needed for the yaw
axis because 14 CFR 25.351 was revised at Amendment 25-91 to take into
account effects of an electronic flight control system. No special
conditions are needed for the pitch axis because the method that
Embraer proposed for the pitch maneuver takes into account effects of
an electronic flight control system.
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 ERJ 190-300 airplanes. Should Embraer 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 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
requirements.
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 the Embraer Model ERJ 190-300 series
airplanes.
In lieu of compliance to 14 CFR 25.349(a), the Embraer Model ERJ
190-300 airplane must comply with the following:
The following conditions, speeds, and cockpit roll control motions
(except as the motions may be limited by pilot effort) must be
considered in combination with an airplane load factor of zero and of
two-thirds of the positive maneuvering factor used in design. In
determining the resulting control surface deflections, the torsional
flexibility of the wing must be considered in accordance with 14 CFR
25.301(b).
(a) Conditions corresponding to steady rolling velocities must be
investigated. In addition, conditions corresponding to maximum angular
acceleration must be investigated for airplanes with engines or other
weight concentrations outboard of the fuselage. For the angular
acceleration conditions, zero rolling velocity may be assumed in the
absence of a rational time history investigation of the maneuver.
(b) At VA, sudden movement of the cockpit roll control
up to the limit is assumed. The position of the cockpit roll control
must be maintained until a steady roll rate is achieved and then must
be returned suddenly to the neutral position.
(c) At VC, the cockpit roll control must be moved
suddenly and maintained so as to achieve a roll rate not less than that
obtained in paragraph (b).
(d) At VD, the cockpit roll control must be moved
suddenly and maintained so as to achieve a roll rate not less than one
third of that obtained in paragraph (b).
[[Page 36328]]
Issued in Renton, Washington.
Victor Wicklund,
Manager, Transport Standards Branch, Aircraft Certification Service.
[FR Doc. 2017-16417 Filed 8-3-17; 8:45 am]
BILLING CODE 4910-13-P