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Federal Register / Vol. 86, No. 92 / Friday, May 14, 2021 / Rules and Regulations
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 EASA, KonradAdenauer-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 website at https ad.easa.europa.eu. 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 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
0365.
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
0365; 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:
Shahram Daneshmandi, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA
98198; telephone and fax 206231
3220; email shahram.daneshmandi@
faa.gov.
SUPPLEMENTARY INFORMATION:

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Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA Emergency AD
20210120E, dated May 3, 2021 EASA
Emergency AD 20210120E also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain ATRGIE Avions de Transport Regional Model ATR42500
and ATR72212A airplanes.
This AD was prompted by reports of temporary loss of all display units and the IESI. The investigation is ongoing and the root cause is not yet known, but the initial investigation revealed that the battery toggle switch functional item number FIN 7PA and the contactor
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FIN 1PA were two potential contributors to the reported cases. The FAA is issuing this AD to address temporary loss of all display units and the IESI, which could result in loss of control of the airplane. See the MCAI for additional background information.
Related Service Information Under 1
CFR Part 51
EASA Emergency AD 20210120E
describes procedures for revising the existing AFM to update a systems limitation for the transformer rectifier unit TRU, limiting dispatch with certain equipment inoperative which can be done by amending the operators minimum equipment list MEL, performing an operational test of the contactor FIN 1PA for discrepancies i.e., a lack of power supply to DU 4 or a static inverter 1 INV FAULT not being displayed on 29VU, performing an electrical test of the battery toggle switch FIN 7PA, and corrective actions.
Corrective actions include replacement of the contactor FIN 1PA and restoring wiring. EASA Emergency AD 2021
0120E also describes procedures for reporting test results to ATRGIE
Avions de Transport Regional.
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 evaluated all pertinent information and determined the unsafe condition exists and is likely to exist or develop on other products of the same type design.
Requirements of This AD
This AD requires accomplishing the actions specified in EASA Emergency AD 20210120E described previously, as incorporated by reference, except for any differences identified as exceptions in the regulatory text of this AD.
EASA Emergency AD 20210120E
requires operators to inform all flight crews of revisions to the AFM, and thereafter to operate the aeroplane accordingly. However, this AD would not specifically require those actions as those actions are already required by FAA regulations. FAA regulations require operators furnish to pilots any
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changes to the AFM for example, 14
CFR 121.137, and to ensure the pilots are familiar with the AFM for example, 14 CFR 91.505. As with any other flightcrew training requirement, training on the updated AFM content is tracked by the operators and recorded in each pilots training record, which is available for the FAA to review. FAA
regulations also require pilots to follow the procedures in the existing AFM
including all updates. 14 CFR 91.9
requires that any person operating a civil aircraft must comply with the operating limitations specified in the AFM. Therefore, including a requirement in this AD to operate the airplane according to the revised AFM
would be redundant and unnecessary.
Further, compliance with such a requirement in an AD would be impracticable to demonstrate or track on an ongoing basis; therefore, a requirement to operate the airplane in such a manner would be unenforceable.
Explanation of Required Compliance Information In the FAAs ongoing efforts to improve the efficiency of the AD
process, the FAA initially worked with Airbus and EASA to develop a process to use certain EASA ADs as the primary source of information for compliance with requirements for corresponding FAA ADs. The FAA has since coordinated with other manufacturers and civil aviation authorities CAAs to use this process. As a result, EASA
Emergency AD 20210120E is incorporated by reference in this final rule. This AD, therefore, requires compliance with EASA Emergency AD
20210120E in its entirety, through that incorporation, except for any differences identified as exceptions in the regulatory text of this AD. Using common terms that are the same as the heading of a particular section in the EASA AD does not mean that operators need comply only with that section. For example, where the AD requirement refers to all required actions and compliance times, compliance with this AD requirement is not limited to the section titled Required Actions and Compliance Times in the EASA
AD. Service information specified in EASA Emergency AD 20210120E that is required for compliance with EASA
Emergency AD 20210120E is available on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0365.

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