Unknown. Final special conditions

4,321 words·~20 min read·/register/2019/10/09/2019-21794·

A research copy — for the controlling text, always check the official state or federal source. Not legal advice.

--- schema: federal-register doc_type: fedreg source_file: FR-2019-10-09.xml --- 84 196 Wednesday, October 9, 2019 Contents Administrative Administrative Office of United States Courts NOTICES Public Hearing: Judicial Conference Advisory Committee on the Federal Rules of Appellate Procedure; Cancellation, 54102 2019-22092 Agricultural Marketing Agricultural Marketing Service NOTICES Agency Information Collection Activities; Proposals, Submissions, and Approvals: Fruit Crops, 54102-54103 2019-22077 Agriculture Agriculture Department See Agricultural Marketing Service NOTICES Agency Information Collection Activities;

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To subscribe to the Federal Register Table of Contents electronic mailing list, go to https://public.govdelivery.com/accounts/USGPOOFR/subscriber/new, enter your e-mail address, then follow the instructions to join, leave, or manage your subscription. 84 196 Wednesday, October 9, 2019 Rules and Regulations DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 25 [Docket No. FAA-2019-0488; Special Conditions No. 25-756-SC] Special Conditions: Voyageur Aerotech Inc., Bombardier DHC-8-100, DHC-8-200, DHC-8-300 and DHC-8-400 Series Airplanes;

Installed Rechargeable Lithium Batteries AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final special conditions. SUMMARY: These special conditions are issued for the Bombardier Model No. DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes. These airplanes, as modified by Voyageur Aerotech Inc. (Voyageur), will have novel or unusual design features when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes.

This design feature is a rechargeable lithium battery pack inside the Emergency Backup Power Supply. 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: Effective October 9, 2019. FOR FURTHER INFORMATION CONTACT:

Nazih Khaouly, Airplane and 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: Background On September 10, 2018, Voyageur applied for a supplemental type certificate for a rechargeable lithium battery pack inside the Emergency Backup Power Supply in the Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes.

The Bombardier Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes are twin engine powered airplanes with standard seating provisions for up to 86 passengers, depending on model, and a maximum takeoff weight of between 33,000 lbs. and 65,200 lbs., depending on series model. Type Certification Basis Under the provisions of title 14, Code of Federal Regulations (14 CFR) 21.101, Voyageur must show that the Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes, as changed, continue to meet the applicable provisions of the regulations listed in Type Certificate No.

A13NM 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 Bombardier Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 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 Bombardier Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes must comply with the fuel vent and exhaust emission requirements of 14 CFR part 34 and the noise certification requirements of 14 CFR part 36.

The FAA issues special conditions, as defined in 14 CFR 11.19, in accordance with § 11.38, and they become part of the type certification basis under § 21.101. Novel or Unusual Design Features The Bombardier Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes will incorporate the following novel or unusual design feature: The installation of a rechargeable lithium battery pack inside the Emergency Backup Power Supply. 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, 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.

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. These special conditions are substantively similar to special conditions the FAA has released in the past. The special conditions have been drafted into a plain English format, reorganized for clarity, and provide more prescriptive instructions than previously released special conditions. 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 14 CFR 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.

Although these special conditions require specific functionalities and capabilities, and address certain critical failure modes of rechargeable lithium batteries and their installations, the applicant must also meet the requirements of §§ 25.1301, 25.1309, and 25.1709, when applicable, in addition to these special conditions. To date, in-service experience has shown that rechargeable lithium battery thermal/pressure runaway conditions are not extremely improbable. Applicants must assume such failures could occur sometime during the life of the battery installation when demonstrating compliance with § 25.1309.

If an applicant proposes to install a rechargeable lithium battery in a rotor burst zone, the applicant must assess the rotor burst induced damage to the battery to show compliance with § 25.903(d)(1) in conjunction with showing compliance with the rechargeable lithium battery special condition. 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. Discussion of Comments The FAA issued Notice of Proposed Special Conditions No. 25-19-09-SC for the Bombardier Model No. DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes, which was published in the **Federal Register** on July 22, 2019 (84 FR 35041). No comments were received, and the special conditions are adopted as proposed. Applicability As discussed above, these special conditions are applicable to the Bombardier Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes. Should Voyageur apply at a later date for a supplemental type certificate to modify any other model included on Type Certificate No. A13NM to incorporate the same novel or unusual design feature, these special conditions would apply to that model as well. Under standard practice, the effective date of final special conditions would be 30 days after the date of publication in the **Federal Register** . However, as the certification date for the Bombardier Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes is imminent, the FAA finds that good cause exists to make these special conditions effective upon publication. Conclusion This action affects only certain novel or unusual design features on Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes. It is not a rule of general applicability and affects only the applicant who applied to the FAA for approval of these features 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 Bombardier Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes, as modified by Voyageur Aerotech Inc. In lieu of title 14, Code of Federal Regulations (14 CFR) 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 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 this special condition, a battery and the battery system is referred to as a battery. Issued in Des Moines, Washington, on September 27, 2019. James Wilborn, Acting Manager, Transport Standards Branch, Policy and Innovation Division, Aircraft Certification Service. [FR Doc. 2019-21794 Filed 10-8-19; 8:45 am]

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