Special Conditions: Peregrine; Installed Rechargeable Lithium Batteries, 3921-3923 [2022-01443]
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3921
Rules and Regulations
Federal Register
Vol. 87, No. 17
Wednesday, January 26, 2022
This section of the FEDERAL REGISTER
contains regulatory documents having general
applicability and legal effect, most of which
are keyed to and codified in the Code of
Federal Regulations, which is published under
50 titles pursuant to 44 U.S.C. 1510.
The Code of Federal Regulations is sold by
the Superintendent of Documents.
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. FAA–2022–0056; Special
Conditions No. 25–806–SC]
Special Conditions: Peregrine;
Installed Rechargeable Lithium
Batteries
Federal Aviation
Administration (FAA), DOT.
ACTION: Final special conditions; request
for comments.
AGENCY:
These special conditions are
issued for a supplemental type
certificate to install rechargeable lithium
batteries in the Emergency Exit Light
(EEL) power supply on certain transport
category airplanes. These airplanes, as
modified by Peregrine, 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 the
installation of an EEL power supply that
contains 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
Peregrine on January 26, 2022. Send
comments on or before March 14, 2022.
ADDRESSES: Send comments identified
by Docket No. FAA–2022–0056 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
khammond on DSKJM1Z7X2PROD with RULES
SUMMARY:
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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: Except for Confidential
Business Information (CBI) as described
in the following paragraph, and other
information as described in 14 CFR
11.35, the FAA will post all comments
received without change to https://
www.regulations.gov/, including any
personal information you provide. The
FAA will also post a report
summarizing each substantive verbal
contact received about this proposal.
Confidential Business Information:
Confidential Business Information (CBI)
is commercial or financial information
that is both customarily and actually
treated as private by its owner. Under
the Freedom of Information Act (FOIA)
(5 U.S.C. 552), CBI is exempt from
public disclosure. If your comments
responsive to this Notice contain
commercial or financial information
that is customarily treated as private,
that you actually treat as private, and
that is relevant or responsive to this
Notice, it is important that you clearly
designate the submitted comments as
CBI. Please mark each page of your
submission containing CBI as
‘‘PROPIN.’’ The FAA will treat such
marked submissions as confidential
under the FOIA, and the indicated
comments will not be placed in the
public docket of this Notice.
Submissions containing CBI should be
sent to Nazih Khaouly, Aircraft Systems,
AIR–623, Technical Innovation Policy
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.
Comments the FAA receives, which are
not specifically designated as CBI, will
be placed in the public docket for this
rulemaking.
Docket: Background documents or
comments received may be read at
https://www.regulations.gov/ at any time.
Follow the online instructions for
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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, Aircraft Systems, AIR–
623, Technical Innovation Policy
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 January 22, 2021, Peregrine
applied for a supplemental type
certificate to install rechargeable lithium
batteries in the ELL power supply.
Peregrine wants to apply this STC to
multiple transport category airplanes
and may periodically amend this STC to
expand its applicability to include
additional transport category airplane
makes and models.
Type Certification Basis
Under the provisions of title 14, Code
of Federal Regulations (14 CFR) 21.101,
Peregrine must show that airplanes, for
which they make application to modify
by STC no. ST01086DE, as changed,
continue to meet the applicable
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Federal Register / Vol. 87, No. 17 / Wednesday, January 26, 2022 / Rules and Regulations
provisions of the regulations listed in
each airplane’s respective type
certificate 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
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 airplane model for
which they are issued. Should the
applicant apply for an STC 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 airplanes modified by
STC no. ST01086DE 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 airplanes with STC no.
ST01086DE will incorporate the
following novel or unusual design
feature:
The installation of an EEL power
supply that contains rechargeable
lithium batteries.
khammond on DSKJM1Z7X2PROD with RULES
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.
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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. Special Condition 4
clarifies that the flammable-fluid fireprotection 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
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.
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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 airplane
models listed on the approved model
list (AML) of STC no. ST01086DE,
which is available at rgl.faa.gov. All
models listed in the AML must be
evaluated and determined to comply
with these special conditions.
Additionally each new model added to
the AML subsequently must also be
evaluated and determined to comply
with these special conditions. Should
Peregrine apply at a later date for a
change to STC no. ST01086DE to
include any other model on the AML to
incorporate the same novel or unusual
design feature, these special conditions
would apply to that model as well.
Should Peregrine apply at a later date
for another STC to modify any other
model included on the type certificates
of the models on the STC no.
ST01086DE AML to incorporate the
same novel or unusual design feature,
these special conditions would also
apply to that model as well. These
special conditions are not applicable to
those models in which special
conditions for rechargeable lithium
batteries have already been issued
against the Type Certificate for that
specific model.
Conclusion
This action only affects the
installation of an EEL power supply that
contains rechargeable lithium batteries
on the airplane models listed on the
AML of STC no. ST01086DE. It is not
a rule of general applicability and
affects only the applicant who will
apply to the FAA for approval of these
features on the airplanes.
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 airplane models listed on the
approved model list of
■
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Federal Register / Vol. 87, No. 17 / Wednesday, January 26, 2022 / Rules and Regulations
supplemental type certificate no.
ST01086DE, as modified by Peregrine.
In lieu of § 25.1353(b)(1) through (4)
at amendment 25–123, or § 25.1353(c)(1)
through (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 flight crew 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.
khammond on DSKJM1Z7X2PROD with RULES
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 Kansas City, Missouri, on January
20, 2022.
Patrick R. Mullen,
Manager, Technical Innovation Policy
Branch, Policy and Innovation Division,
Aircraft Certification Service.
[FR Doc. 2022–01443 Filed 1–25–22; 8:45 am]
BILLING CODE 4910–13–P
VerDate Sep<11>2014
15:49 Jan 25, 2022
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2022–0009; Project
Identifier MCAI–2021–01459–R; Amendment
39–21914; AD 2022–02–17]
RIN 2120–AA64
Airworthiness Directives; Airbus
Helicopters Deutschland GmbH (AHD)
Helicopters
Federal Aviation
Administration (FAA), DOT.
ACTION: Final rule; request for
comments.
AGENCY:
The FAA is adopting a new
airworthiness directive (AD) for all
Airbus Helicopters Deutschland GmbH
(AHD) Model MBB–BK 117 C–2, MBB–
BK 117 D–2, and MBB–BK 117 D–3
helicopters. This AD was prompted by
reports of engine flame out following
prolonged operations in falling snow on
helicopters with an inlet barrier filter
(IBF) system installed. This AD requires
revising the existing Rotorcraft Flight
Manual (RFM) for your helicopter, as
specified in a European Union Aviation
Safety Agency (EASA) AD, which is
incorporated by reference. The FAA is
issuing this AD to address the unsafe
condition on these products.
DATES: This AD becomes effective
February 10, 2022.
The Director of the Federal Register
approved the incorporation by reference
of a certain publication listed in this AD
as of February 10, 2022.
The FAA must receive comments on
this AD by March 14, 2022.
ADDRESSES: You may send comments,
using the procedures found in 14 CFR
11.43 and 11.45, by any of the following
methods:
• Federal eRulemaking Portal: Go to
https://www.regulations.gov. Follow the
instructions for submitting comments.
• Fax: (202) 493–2251.
• Mail: U.S. Department of
Transportation, Docket Operations, M–
30, West Building Ground Floor, Room
W12–140, 1200 New Jersey Avenue SE,
Washington, DC 20590.
• Hand Delivery: Deliver to Mail
address above between 9 a.m. and 5
p.m., Monday through Friday, except
Federal holidays.
For EASA material incorporated by
reference (IBR) in this final rule, contact
EASA, Konrad-Adenauer-Ufer 3, 50668
Cologne, Germany; telephone +49 221
8999 000; email ADs@easa.europa.eu;
internet www.easa.europa.eu. You may
find this IBR material on the EASA
SUMMARY:
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3923
website at https://ad.easa.europa.eu.
For Airbus Helicopters service
information identified in this final rule,
contact Airbus Helicopters, 2701 North
Forum Drive, Grand Prairie, TX 75052;
telephone (972) 641–0000 or (800) 232–
0323; fax (972) 641–3775; or at https://
www.airbus.com/helicopters/services/
technical-support.html. You may view
this material at the FAA, Office of the
Regional Counsel, Southwest Region,
10101 Hillwood Pkwy., Room 6N–321,
Fort Worth, TX 76177. For information
on the availability of this material at the
FAA, call (817) 222–5110. Service
information that is IBRed is also
available in the AD docket at https://
www.regulations.gov by searching for
and locating Docket No. FAA–2022–
0009.
Examining the AD Docket
You may examine the AD docket at
https://www.regulations.gov by
searching for and locating Docket No.
FAA–2022–0009; or in person at Docket
Operations between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal
holidays. The AD docket contains this
final rule, the EASA AD, any comments
received, and other information. The
street address for Docket Operations is
listed above. Comments will be
available in the AD docket shortly after
receipt.
FOR FURTHER INFORMATION CONTACT: Hal
Jensen, Aerospace Engineer, Operational
Safety Branch, Compliance &
Airworthiness Division, FAA, 950
L’Enfant Plaza N SW, Washington, DC
20024; telephone (202) 267–9167; email
hal.jensen@faa.gov.
SUPPLEMENTARY INFORMATION:
Background
EASA, which is the Technical Agent
for the Member States of the European
Union, has issued EASA Emergency AD
2021–0289–E, dated December 23, 2021
(EASA AD 2021–0289–E), to correct an
unsafe condition for all Airbus
Helicopters Deutschland GmbH (AHD),
formerly Eurocopter Deutschland
GmbH; and Airbus Helicopters Inc.,
formerly American Eurocopter LLC,
Model MBB–BK117 C–2, D–2, D–3, and
D–3m helicopters, all variants, all serial
numbers.
This AD was prompted by reports of
engine flame out following prolonged
operations in falling snow with the IBF
system installed. The FAA is issuing
this AD to prevent partial icing of an
IBF engine intake and engine flame out.
The unsafe condition, if not addressed,
could result in engine failure and
reduced control of the helicopter,
possibly resulting in damage to the
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]]>Agencies
[Federal Register Volume 87, Number 17 (Wednesday, January 26, 2022)]
[Rules and Regulations]
[Pages 3921-3923]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2022-01443]
========================================================================
Rules and Regulations
Federal Register
________________________________________________________________________
This section of the FEDERAL REGISTER contains regulatory documents
having general applicability and legal effect, most of which are keyed
to and codified in the Code of Federal Regulations, which is published
under 50 titles pursuant to 44 U.S.C. 1510.
The Code of Federal Regulations is sold by the Superintendent of Documents.
========================================================================
Federal Register / Vol. 87, No. 17 / Wednesday, January 26, 2022 /
Rules and Regulations
[[Page 3921]]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. FAA-2022-0056; Special Conditions No. 25-806-SC]
Special Conditions: Peregrine; Installed Rechargeable Lithium
Batteries
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final special conditions; request for comments.
-----------------------------------------------------------------------
SUMMARY: These special conditions are issued for a supplemental type
certificate to install rechargeable lithium batteries in the Emergency
Exit Light (EEL) power supply on certain transport category airplanes.
These airplanes, as modified by Peregrine, 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 the installation of an EEL power supply that contains
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 Peregrine on January 26, 2022. Send
comments on or before March 14, 2022.
ADDRESSES: Send comments identified by Docket No. FAA-2022-0056 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: Except for Confidential Business Information (CBI) as
described in the following paragraph, and other information as
described in 14 CFR 11.35, the FAA will post all comments received
without change to https://www.regulations.gov/, including any personal
information you provide. The FAA will also post a report summarizing
each substantive verbal contact received about this proposal.
Confidential Business Information: Confidential Business
Information (CBI) is commercial or financial information that is both
customarily and actually treated as private by its owner. Under the
Freedom of Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from
public disclosure. If your comments responsive to this Notice contain
commercial or financial information that is customarily treated as
private, that you actually treat as private, and that is relevant or
responsive to this Notice, it is important that you clearly designate
the submitted comments as CBI. Please mark each page of your submission
containing CBI as ``PROPIN.'' The FAA will treat such marked
submissions as confidential under the FOIA, and the indicated comments
will not be placed in the public docket of this Notice. Submissions
containing CBI should be sent to Nazih Khaouly, Aircraft Systems, AIR-
623, Technical Innovation Policy 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]. Comments
the FAA receives, which are not specifically designated as CBI, will be
placed in the public docket for this rulemaking.
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, Aircraft Systems, AIR-
623, Technical Innovation Policy 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 January 22, 2021, Peregrine applied for a supplemental type
certificate to install rechargeable lithium batteries in the ELL power
supply. Peregrine wants to apply this STC to multiple transport
category airplanes and may periodically amend this STC to expand its
applicability to include additional transport category airplane makes
and models.
Type Certification Basis
Under the provisions of title 14, Code of Federal Regulations (14
CFR) 21.101, Peregrine must show that airplanes, for which they make
application to modify by STC no. ST01086DE, as changed, continue to
meet the applicable
[[Page 3922]]
provisions of the regulations listed in each airplane's respective type
certificate 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 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 airplane model
for which they are issued. Should the applicant apply for an STC 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 airplanes modified by STC no. ST01086DE 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 airplanes with STC no. ST01086DE will incorporate the following
novel or unusual design feature:
The installation of an EEL power supply that contains 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.
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. 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
airplane models listed on the approved model list (AML) of STC no.
ST01086DE, which is available at rgl.faa.gov. All models listed in the
AML must be evaluated and determined to comply with these special
conditions. Additionally each new model added to the AML subsequently
must also be evaluated and determined to comply with these special
conditions. Should Peregrine apply at a later date for a change to STC
no. ST01086DE to include any other model on the AML to incorporate the
same novel or unusual design feature, these special conditions would
apply to that model as well. Should Peregrine apply at a later date for
another STC to modify any other model included on the type certificates
of the models on the STC no. ST01086DE AML to incorporate the same
novel or unusual design feature, these special conditions would also
apply to that model as well. These special conditions are not
applicable to those models in which special conditions for rechargeable
lithium batteries have already been issued against the Type Certificate
for that specific model.
Conclusion
This action only affects the installation of an EEL power supply
that contains rechargeable lithium batteries on the airplane models
listed on the AML of STC no. ST01086DE. It is not a rule of general
applicability and affects only the applicant who will apply to the FAA
for approval of these features on the airplanes.
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
0
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 airplane models listed on the approved
model list of
[[Page 3923]]
supplemental type certificate no. ST01086DE, as modified by Peregrine.
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, 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 flight
crew 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 Kansas City, Missouri, on January 20, 2022.
Patrick R. Mullen,
Manager, Technical Innovation Policy Branch, Policy and Innovation
Division, Aircraft Certification Service.
[FR Doc. 2022-01443 Filed 1-25-22; 8:45 am]
BILLING CODE 4910-13-P
