Special Conditions: Chicago Jet Group, Dassault Aviation Model Falcon 900 Airplane; Rechargeable Lithium Batteries, 67436-67438 [2020-22618]
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67436
Federal Register / Vol. 85, No. 206 / Friday, October 23, 2020 / Rules and Regulations
except for earlier amendments as agreed
upon by the FAA.
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 Boeing Model 7737–300, –400,
–700, –800, –8, and –9 series 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 applicant apply
for a supplemental type certificate to
modify any other model included on the
same type certificate 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 Boeing Model 737 series
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 § 11.38, and they become part of
the type certification basis under
§ 21.101.
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Novel or Unusual Design Feature
The Boeing Model 737–300, –400,
–700, –800, –8, and –9 series airplanes
will incorporate the following novel or
unusual design feature:
A digital systems architecture for the
installation of a system with wireless
network and hosted application
functionality that allows access, from
sources internal to the airplane, to the
airplane’s internal electronic
components.
Discussion
The digital systems architecture for
the installation of an Avionica avWiFi
system with wireless network and
hosted application functionality on
these Boeing Model 737 airplanes is a
novel or unusual design feature for
transport category airplanes because it is
composed of several connected
networks. This proposed network
architecture is used for a diverse set of
airplane functions, including:
• Flight-safety related control and
navigation systems,
• airline business and administrative
support, and
• passenger entertainment.
The airplane control domain and
airline information-services domain of
these networks perform functions
required for the safe operation and
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Jkt 253001
maintenance of the airplane. Previously,
these domains had very limited
connectivity with other network
sources. This network architecture
creates a potential for unauthorized
persons to access the aircraft control
domain and airline information-services
domain from sources internal to the
airplane, and presents security
vulnerabilities related to the
introduction of computer viruses and
worms, user errors, and intentional
sabotage of airplane electronic assets
(networks, systems, and databases)
critical to the safety and maintenance of
the airplane.
The existing FAA regulations did not
anticipate these networked airplane
system architectures. Furthermore, these
regulations and the current guidance
material do not address potential
security vulnerabilities, which could be
exploited by unauthorized access to
airplane networks, data buses, and
servers. Therefore, these special
conditions ensure that the security (i.e.,
confidentiality, integrity, and
availability) of airplane systems will not
be compromised by unauthorized wired
or wireless electronic connections from
within the airplane. These special
conditions also require the applicant to
provide appropriate instructions to the
operator to maintain all electronicsystem safeguards that have been
implemented as part of the original
network design so that this feature does
not allow or reintroduce security
threats.
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.
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 Boeing Model
737–300, –400, –700, –800, –8, and –9
series airplanes, as modified by
Archeion Holdings, LLC, for airplane
electronic-system security protection
from unauthorized internal access.
1. The applicant must ensure that the
design provides isolation from, or
airplane electronic-system security
protection against, access by
unauthorized sources internal to the
airplane. The design must prevent
inadvertent and malicious changes to,
and all adverse impacts upon, airplane
equipment, systems, networks, or other
assets required for safe flight and
operations.
2. The applicant must establish
appropriate procedures to allow the
operator to ensure that continued
airworthiness of the aircraft is
maintained, including all post type
certification modifications that may
have an impact on the approved
electronic-system security safeguards.
Issued in Des Moines, Washington, on
October 5, 2020.
James E. Wilborn,
Acting Manager, Transport Standards
Branch, Policy and Innovation Division,
Aircraft Certification Service.
[FR Doc. 2020–22357 Filed 10–22–20; 8:45 am]
Applicability
BILLING CODE 4910–13–P
As discussed above, these special
conditions are applicable to Boeing
Model 737–300, –400, –700, –800, –8,
and –9 series airplanes. Should
Archeion apply at a later date for a
supplemental type certificate to modify
any other model included on Type
Certificate No. A16WE to incorporate
the same novel or unusual design
feature, these special conditions would
apply to that model as well.
Conclusion
This action affects only a certain
novel or unusual design feature on
Boeing Model 737–300, –400, –700,
–800, –8, and –9 series airplanes. It is
not a rule of general applicability and
affects only the applicant.
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. FAA–2020–0927; Special
Conditions No. 25–776–SC]
Special Conditions: Chicago Jet
Group, Dassault Aviation Model Falcon
900 Airplane; Rechargeable Lithium
Batteries
Federal Aviation
Administration (FAA), DOT.
ACTION: Final special conditions; request
for comments.
AGENCY:
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Federal Register / Vol. 85, No. 206 / Friday, October 23, 2020 / Rules and Regulations
These special conditions are
issued for the Dassault Aviation
(Dassault) Model Falcon 900 airplane.
This airplane, as modified by Chicago
Jet Group, 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 Midcontinent Instrument TS835
Standby Batteries that contain
rechargeable lithium batteries. 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
Chicago Jet Group on October 23, 2020.
Send comments on or before December
7, 2020.
ADDRESSES: Send comments identified
by Docket No. FAA–2020–0927 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
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SUMMARY:
VerDate Sep<11>2014
16:19 Oct 22, 2020
Jkt 253001
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:
Nazih Khaouly, Airplane & Flight Crew
Interface Section, AIR–671, Transport
Standards Branch, Policy and
Innovation Division, Aircraft
Certification Service, Federal Aviation
Administration, 2200 South 216th
Street, Des Moines, Washington 98198;
telephone and fax 206–231–3160; email
nazih.khaouly@faa.gov.
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
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 April 27, 2020, Chicago Jet Group
applied for a supplemental type
certificate to install, in the Dassault
Model Falcon 900 airplane,
Midcontinent Instrument TS835
Standby Batteries that contain
rechargeable lithium batteries. The
Dassault Model Falcon 900 airplane is a
three-engine, transport category
business jet, with capacity for 19
passengers, and a maximum takeoff
weight of 45,500 lbs.
Type Certification Basis
Under the provisions of title 14, Code
of Federal Regulations (14 CFR) 21.101,
Chicago Jet Group must show that the
Dassault Model Falcon 900 airplane, as
changed, continues to meet the
applicable provisions of the regulations
listed in Type Certificate No. A46EU or
the applicable regulations in effect on
the date of application for the change,
except for earlier amendments as agreed
upon by the FAA.
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67437
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 900
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 applicant apply
for a supplemental type certificate to
modify any other model included on the
same type certificate 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 Dassault Model Falcon
900 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 § 11.38, and they become part of
the type certification basis under
§ 21.101.
Novel or Unusual Design Features
The Dassault Model Falcon 900
airplane will incorporate the following
novel or unusual design features:
Midcontinent Instrument TS835
Standby Batteries that contain
rechargeable lithium batteries.
Discussion
Rechargeable lithium batteries are
considered to be a novel or unusual
design feature in transport category
airplanes, with respect to the
requirements in § 25.1353. This type of
battery has certain failure, operational,
and maintenance characteristics that
differ significantly from those of the
nickel-cadmium and lead-acid
rechargeable batteries currently
approved for installation on transport
category airplanes. These batteries
introduce higher energy levels into
airplane systems through new chemical
compositions in various battery-cell
sizes and construction. Interconnection
of these cells in battery packs introduces
failure modes that require unique design
considerations, such as provisions for
thermal management.
Known uses of rechargeable and nonrechargeable lithium batteries on
airplanes include:
• Flightdeck and avionics systems
such as displays, global positioning
systems, cockpit voice recorders, flight
data recorders, underwater-locatorbeacons, navigation computers,
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23OCR1
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67438
Federal Register / Vol. 85, No. 206 / Friday, October 23, 2020 / Rules and Regulations
integrated avionics computers, satellite
network/communication systems,
communication management units, and
remote monitor electronic line
replaceable units;
• Cabin safety, entertainment and
communications equipment including
emergency locator transmitters, life
rafts, escape slides, seat belt air bags,
cabin management systems, Ethernet
switches, routers and media servers,
wireless systems, internet/in-flight
entertainment systems, satellite
televisions, remotes and handsets; and
• Systems in cargo areas including
door controls, sensors, video
surveillance equipment and security
systems.
Special Condition 1 requires that each
individual cell within a battery be
designed to maintain safe temperatures
and pressures. Special Condition 2
addresses these same issues but for the
entire battery. Special Condition 2
requires that the battery be designed to
prevent propagation of a thermal event,
such as self-sustained, uncontrolled
increases in temperature or pressure
from one cell to adjacent cells.
Special Conditions 1 and 2 are
intended to ensure that the cells and
battery are designed to eliminate the
potential for uncontrollable failures.
However, a certain number of failures
will occur due to various factors beyond
the control of the designer. Therefore,
other special conditions are intended to
protect the airplane and its occupants if
failure occurs.
Special Conditions 3, 7, and 8 are selfexplanatory, and the FAA does not
provide further explanation for them at
this time.
Special Condition 4 clarifies that the
flammable-fluid fire-protection
requirements of § 25.863 apply to
rechargeable lithium battery
installations. Section 25.863 is
applicable to areas of the airplane that
could be exposed to flammable fluid
leakage from airplane systems.
Rechargeable lithium batteries contain
electrolyte that is a flammable fluid.
Special Condition 5 requires each
rechargeable lithium battery installation
to not damage surrounding structure or
adjacent systems, equipment, or
electrical wiring from corrosive fluids or
gases that may escape in such a way as
to cause a major or more severe failure
condition. Special Condition 6 requires
each rechargeable lithium battery
installation to have provisions to
prevent any hazardous effect on
airplane structure or systems caused by
the maximum amount of heat it can
generate due to any failure of it or its
individual cells. The means of meeting
VerDate Sep<11>2014
16:19 Oct 22, 2020
Jkt 253001
special conditions 5 and 6 may be the
same, but they are independent
requirements addressing different
hazards. Special Condition 5 addresses
corrosive fluids and gases, whereas
special condition 6 addresses heat.
Special Condition 9 requires
rechargeable lithium batteries to have
‘‘automatic’’ means, for charge rate and
disconnect, due to the fast-acting nature
of lithium battery chemical reactions.
Manual intervention would not be
timely or effective in mitigating the
hazards associated with these batteries.
These special conditions apply to all
rechargeable lithium battery
installations in lieu of § 25.1353(b)(1)
through (4) at Amendment 25–123 or
§ 25.1353(c)(1) through (4) at earlier
amendments. Those regulations remain
in effect for other battery installations.
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 900 airplane. Should
Chicago Jet Group apply at a later date
for a supplemental type certificate to
modify any other model included on
Type Certificate No. A46EU to
incorporate the same novel or unusual
design feature, these special conditions
would apply to that model as well.
Conclusion
This action affects only a certain
novel or unusual design feature on one
model of airplane, as modified by
Chicago Jet Group. It is not a rule of
general applicability and affects only
the applicant who applied to the FAA
for approval of this feature on the
airplane.
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 Model
Falcon 900 airplanes, as modified by
Chicago Jet Group.
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In lieu of § 25.1353(b)(1) through
(b)(4) at amendment 25–123 or
§ 25.1353(c)(1) through (c)(4) at earlier
amendments, each rechargeable lithium
battery installation must:
1. Be designed to maintain safe cell
temperatures and pressures under all
foreseeable operating conditions to
prevent fire and explosion.
2. Be designed to prevent the
occurrence of self-sustaining,
uncontrollable increases in temperature
or pressure, and automatically control
the charge rate of each cell to protect
against adverse operating conditions,
such as cell imbalance, back charging,
overcharging and overheating.
3. Not emit explosive or toxic gases,
either in normal operation or as a result
of its failure, that may accumulate in
hazardous quantities within the
airplane.
4. Meet the requirements of § 25.863.
5. Not damage surrounding structure
or adjacent systems, equipment, or
electrical wiring from corrosive fluids or
gases that may escape in such a way as
to cause a major or more-severe failure
condition.
6. Have provisions to prevent any
hazardous effect on airplane structure or
systems caused by the maximum
amount of heat it can generate due to
any failure of it or its individual cells.
7. Have a failure sensing and warning
system to alert the flightcrew if its
failure affects safe operation of the
airplane.
8. Have a monitoring and warning
feature that alerts the flightcrew when
its charge state falls below acceptable
levels if its function is required for safe
operation of the airplane.
9. Have a means to automatically
disconnect from its charging source in
the event of an over-temperature
condition, cell failure, or battery failure.
Note: A battery system consists of the
battery, battery charger, and any
protective monitoring and alerting
circuitry or hardware inside or outside
of the battery. It also includes vents
(where necessary) and packaging. For
the purpose of these special conditions,
a battery and the battery system is
referred to as a battery.
Issued in Des Moines, Washington, on
October 7, 2020.
James E. Wilborn,
Acting Manager, Transport Standards
Branch, Policy and Innovation Division,
Aircraft Certification Service.
[FR Doc. 2020–22618 Filed 10–22–20; 8:45 am]
BILLING CODE 4910–13–P
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23OCR1
]]>Agencies
[Federal Register Volume 85, Number 206 (Friday, October 23, 2020)]
[Rules and Regulations]
[Pages 67436-67438]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2020-22618]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. FAA-2020-0927; Special Conditions No. 25-776-SC]
Special Conditions: Chicago Jet Group, Dassault Aviation Model
Falcon 900 Airplane; Rechargeable Lithium Batteries
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final special conditions; request for comments.
-----------------------------------------------------------------------
[[Page 67437]]
SUMMARY: These special conditions are issued for the Dassault Aviation
(Dassault) Model Falcon 900 airplane. This airplane, as modified by
Chicago Jet Group, 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
Midcontinent Instrument TS835 Standby Batteries that contain
rechargeable lithium batteries. 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 Chicago Jet Group on October 23,
2020. Send comments on or before December 7, 2020.
ADDRESSES: Send comments identified by Docket No. FAA-2020-0927 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.
FOR FURTHER INFORMATION CONTACT: Nazih Khaouly, Airplane & Flight Crew
Interface Section, AIR-671, Transport Standards Branch, Policy and
Innovation Division, Aircraft Certification Service, Federal Aviation
Administration, 2200 South 216th Street, Des Moines, Washington 98198;
telephone and fax 206-231-3160; email [email protected].
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
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 April 27, 2020, Chicago Jet Group applied for a supplemental
type certificate to install, in the Dassault Model Falcon 900 airplane,
Midcontinent Instrument TS835 Standby Batteries that contain
rechargeable lithium batteries. The Dassault Model Falcon 900 airplane
is a three-engine, transport category business jet, with capacity for
19 passengers, and a maximum takeoff weight of 45,500 lbs.
Type Certification Basis
Under the provisions of title 14, Code of Federal Regulations (14
CFR) 21.101, Chicago Jet Group must show that the Dassault Model Falcon
900 airplane, as changed, continues to meet the applicable provisions
of the regulations listed in Type Certificate No. A46EU 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 (e.g., 14 CFR part 25) do not contain adequate or
appropriate safety standards for the Dassault Model Falcon 900 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 applicant apply for a supplemental type
certificate to modify any other model included on the same type
certificate 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 Dassault Model Falcon 900 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. 21.101.
Novel or Unusual Design Features
The Dassault Model Falcon 900 airplane will incorporate the
following novel or unusual design features:
Midcontinent Instrument TS835 Standby Batteries that contain
rechargeable lithium batteries.
Discussion
Rechargeable lithium batteries are considered to be a novel or
unusual design feature in transport category airplanes, with respect to
the requirements in Sec. 25.1353. This type of battery has certain
failure, operational, and maintenance characteristics that differ
significantly from those of the nickel-cadmium and lead-acid
rechargeable batteries currently approved for installation on transport
category airplanes. These batteries introduce higher energy levels into
airplane systems through new chemical compositions in various battery-
cell sizes and construction. Interconnection of these cells in battery
packs introduces failure modes that require unique design
considerations, such as provisions for thermal management.
Known uses of rechargeable and non-rechargeable lithium batteries
on airplanes include:
Flightdeck and avionics systems such as displays, global
positioning systems, cockpit voice recorders, flight data recorders,
underwater-locator-beacons, navigation computers,
[[Page 67438]]
integrated avionics computers, satellite network/communication systems,
communication management units, and remote monitor electronic line
replaceable units;
Cabin safety, entertainment and communications equipment
including emergency locator transmitters, life rafts, escape slides,
seat belt air bags, cabin management systems, Ethernet switches,
routers and media servers, wireless systems, internet/in-flight
entertainment systems, satellite televisions, remotes and handsets; and
Systems in cargo areas including door controls, sensors,
video surveillance equipment and security systems.
Special Condition 1 requires that each individual cell within a
battery be designed to maintain safe temperatures and pressures.
Special Condition 2 addresses these same issues but for the entire
battery. Special Condition 2 requires that the battery be designed to
prevent propagation of a thermal event, such as self-sustained,
uncontrolled increases in temperature or pressure from one cell to
adjacent cells.
Special Conditions 1 and 2 are intended to ensure that the cells
and battery are designed to eliminate the potential for uncontrollable
failures. However, a certain number of failures will occur due to
various factors beyond the control of the designer. Therefore, other
special conditions are intended to protect the airplane and its
occupants if failure occurs.
Special Conditions 3, 7, and 8 are self-explanatory, and the FAA
does not provide further explanation for them at this time.
Special Condition 4 clarifies that the flammable-fluid fire-
protection requirements of Sec. 25.863 apply to rechargeable lithium
battery installations. Section 25.863 is applicable to areas of the
airplane that could be exposed to flammable fluid leakage from airplane
systems. Rechargeable lithium batteries contain electrolyte that is a
flammable fluid.
Special Condition 5 requires each rechargeable lithium battery
installation to not damage surrounding structure or adjacent systems,
equipment, or electrical wiring from corrosive fluids or gases that may
escape in such a way as to cause a major or more severe failure
condition. Special Condition 6 requires each rechargeable lithium
battery installation to have provisions to prevent any hazardous effect
on airplane structure or systems caused by the maximum amount of heat
it can generate due to any failure of it or its individual cells. The
means of meeting special conditions 5 and 6 may be the same, but they
are independent requirements addressing different hazards. Special
Condition 5 addresses corrosive fluids and gases, whereas special
condition 6 addresses heat.
Special Condition 9 requires rechargeable lithium batteries to have
``automatic'' means, for charge rate and disconnect, due to the fast-
acting nature of lithium battery chemical reactions. Manual
intervention would not be timely or effective in mitigating the hazards
associated with these batteries.
These special conditions apply to all rechargeable lithium battery
installations in lieu of Sec. 25.1353(b)(1) through (4) at Amendment
25-123 or Sec. 25.1353(c)(1) through (4) at earlier amendments. Those
regulations remain in effect for other battery installations.
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 900 airplane. Should Chicago Jet Group apply at a
later date for a supplemental type certificate to modify any other
model included on Type Certificate No. A46EU to incorporate the same
novel or unusual design feature, these special conditions would apply
to that model as well.
Conclusion
This action affects only a certain novel or unusual design feature
on one model of airplane, as modified by Chicago Jet Group. It is not a
rule of general applicability and affects only the applicant who
applied to the FAA for approval of this feature on the airplane.
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 Model Falcon 900 airplanes,
as modified by Chicago Jet Group.
In lieu of Sec. 25.1353(b)(1) through (b)(4) at amendment 25-123
or Sec. 25.1353(c)(1) through (c)(4) at earlier amendments, each
rechargeable lithium battery installation must:
1. Be designed to maintain safe cell temperatures and pressures
under all foreseeable operating conditions to prevent fire and
explosion.
2. Be designed to prevent the occurrence of self-sustaining,
uncontrollable increases in temperature or pressure, and automatically
control the charge rate of each cell to protect against adverse
operating conditions, such as cell imbalance, back charging,
overcharging and overheating.
3. Not emit explosive or toxic gases, either in normal operation or
as a result of its failure, that may accumulate in hazardous quantities
within the airplane.
4. Meet the requirements of Sec. 25.863.
5. Not damage surrounding structure or adjacent systems, equipment,
or electrical wiring from corrosive fluids or gases that may escape in
such a way as to cause a major or more-severe failure condition.
6. Have provisions to prevent any hazardous effect on airplane
structure or systems caused by the maximum amount of heat it can
generate due to any failure of it or its individual cells.
7. Have a failure sensing and warning system to alert the
flightcrew if its failure affects safe operation of the airplane.
8. Have a monitoring and warning feature that alerts the flightcrew
when its charge state falls below acceptable levels if its function is
required for safe operation of the airplane.
9. Have a means to automatically disconnect from its charging
source in the event of an over-temperature condition, cell failure, or
battery failure.
Note: A battery system consists of the battery, battery charger,
and any protective monitoring and alerting circuitry or hardware inside
or outside of the battery. It also includes vents (where necessary) and
packaging. For the purpose of these special conditions, a battery and
the battery system is referred to as a battery.
Issued in Des Moines, Washington, on October 7, 2020.
James E. Wilborn,
Acting Manager, Transport Standards Branch, Policy and Innovation
Division, Aircraft Certification Service.
[FR Doc. 2020-22618 Filed 10-22-20; 8:45 am]
BILLING CODE 4910-13-P
