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Federal Register / Vol. 86, No. 129 / Friday, July 9, 2021 / Rules and Regulations
300 and ERJ 190400 airplanes. AD
20200811 required revising the existing airplane flight manual AFM
procedures associated with messages of smoke in the electronic bays presented on the respective engine indication and crew alerting system EICAS. This AD
continues to require revising the existing AFM procedures, and adds requirements for a terminating modification of the electrical wiring of the mid-electronic bay and backup smoke detectors; as specified in an Agencia Nacional de Aviacao Civil ANAC AD, which is incorporated by reference. This AD was prompted by a failure propagation test, which revealed that under certain conditions, the smoke detection system of the electrical bays erroneously indicated the presence of smoke via the respective EICAS
messages. The FAA is issuing this AD
to address the unsafe condition on these products.
DATES: This AD becomes effective July 26, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of July 26, 2021.
The FAA must receive comments on this AD by August 23, 2021.
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: 2024932251.
Mail: U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 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 material incorporated by reference IBR in this AD, contact National Civil Aviation Agency ANAC, Aeronautical Products Certification Branch GGCP, Rua Dr. Orlando Feirabend Filho, 230
Centro Empresarial AquariusTorre BAndares 14 a 18, Parque Residencial Aquarius, CEP 12.246190Sao Jose dos CamposSP, BRAZIL, Tel: 55 12
32036600; Email: pac@anac.gov.br;
internet www.anac.gov.br/en/. You may find this IBR material on the ANAC
website at https sistemas.anac.gov.br/
certificacao/DA/DAE.asp. You may view this IBR material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this
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material at the FAA, call 2062313195.
It is also available in the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0456.
Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0456; 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 AD, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Krista Greer, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA 98198;
telephone and fax 2062313223.
SUPPLEMENTARY INFORMATION:
Background The FAA issued AD 20200811, Amendment 3919903 85 FR 27112, May 7, 2020 AD 20200811, which applied to all Yabora Industria Aeronautica Model ERJ 190300 and ERJ 190400 airplanes. AD 20200811
required revising the existing AFM
procedures associated with messages of smoke in the electronic bays presented on the respective EICAS. The FAA
issued AD 20200811 to provide the flightcrew with revised AFM procedures for responding to erroneous indications of smoke in the electrical bays presented on the EICAS. The AFM procedures are intended to prevent loss of all electrical digital current DC essential buses, causing loss of electrical power for critical systems of the airplane.
Actions Since AD 20200811 Was Issued Since the FAA issued AD 202008
11, the FAA has determined that it is necessary to mandate a modification to correct the root cause of erroneous indications of smoke in the electrical bays presented on the EICAS that will allow for removal of the AFM revision required by AD 20200811. Production airplanes are not included in the applicability of this AD because the modification required by this AD is incorporated during production.
ANAC, which is the aviation authority for Brazil, has issued ANAC
AD 20210201, effective February 15, 2021; corrected February 23, 2021
ANAC AD 20210201 also referred to as the Mandatory Continuing Airworthiness Information, or the
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MCAI; to correct an unsafe condition for all Yabora Industria Aeronautica Model ERJ 190300 and ERJ 190400
airplanes. ANAC AD 20210201
superseded ANAC Emergency AD 2019
1201, effective December 9, 2019
which corresponds to FAA AD 2020
0811.
This AD was prompted by a failure propagation test, which revealed that when complete loss of the electrical DC
essential bus 2 was induced, the smoke detection system of the forward and aft electrical bays erroneously indicated the presence of smoke via the respective EICAS messages. When these messages are displayed, the existing AFM
procedures require the flightcrew to turn off the essential electrical buses DC
ESS BUS 1 and DC ESS BUS 3. The FAA is issuing this AD to address a loss of all electrical DC essential buses, and consequent loss of electrical power for critical systems of the airplane. See the MCAI for additional background information.
Explanation of Retained Requirements Although this AD does not explicitly restate the requirements of AD 2020
0811, this AD retains all of the requirements of AD 20200811. Those requirements are referenced in ANAC
AD 20210201, which, in turn, is referenced in paragraph g of this AD.
Related Service Information Under 1
CFR Part 51
ANAC AD 20210201 describes temporary revisions to the existing AFM
procedures associated with messages of smoke in the electronic bays presented on the EICAS, and removal of those temporary revisions once a modification of certain electrical wiring is completed.
ANAC AD 20210201 also describes procedures for modification of electrical wiring of the mid-electronic bay and backup smoke detectors, which is terminating action for the temporary revisions to the AFM. This material is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.
FAAs Determination This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition described in the MCAI referenced above. The FAA is issuing this AD
because the FAA has evaluated all pertinent information and determined
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