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Federal Register / Vol. 86, No. 166 / Tuesday, August 31, 2021 / Rules and Regulations 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
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
0366.
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
0366; 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, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Shahram Daneshmandi, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA
98198; phone and fax: 2062313220;
email: shahram.daneshmandi@faa.gov.
SUPPLEMENTARY INFORMATION:
Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20210024, dated January 19, 2021 EASA AD
20210024 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all ATRGIE
Avions de Transport Regional Model ATR42200, 300, and 320 airplanes.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR

part 39 to supersede AD 20202313, Amendment 3921330 85 FR 73407, November 18, 2020 AD 20202313.
AD 20202313 applied to all ATR
GIE Avions de Transport Regional Model ATR42200, 300, and 320
airplanes. The NPRM published in the Federal Register on May 13, 2021 86
FR 26195. The NPRM was prompted by false activation of the stall warning system due to wiring damage on the wire bundle between an AOA probe and the crew alerting computer, and the development of a wiring modification and AFM update to address the unsafe condition. The NPRM proposed to continue to require the actions in AD
20202313, and also proposed to require for certain airplanes, modifying the captain stick shaker wiring, and for all airplanes, revising the existing AFM
and applicable corresponding operational procedures to incorporate procedures for the stick pusher/shaker, as specified in EASA AD 20210024.
The FAA is issuing this AD to address false activation of the stall warning system, which could result in loss of control of the airplane during take-off and landing phases. See the MCAI for additional background information.
Comments The FAA gave the public the opportunity to participate in developing this final rule. The FAA has considered the comment received. The Air Line Pilots Association, International ALPA
indicated its support for the NPRM.
Explanation of Changes to This AD
The FAA has added paragraph h7
of this AD to clarify what discrepancies are since the ATR
Airworthiness Operators Message AOM referred to in EASA AD 2021
0024 does not use the word discrepancy.
The FAA has revised paragraph h4ii of this AD to clarify that, for inspections done on or before December 3, 2020, those reports must be submitted within 30 days after December 3, 2020. In the proposed AD, the FAA
inadvertently stated that the reports were to be submitted within 30 days
after the effective date of this AD.
However, this requirement is retained from AD 20202313 and the FAA
intends for the compliance time to remain the same.
Conclusion The FAA reviewed the relevant data, considered the comment received, and determined that air safety and the public interest require adopting this final rule with the changes described previously and minor editorial changes.
The FAA has determined that these minor changes:
Are consistent with the intent that was proposed in the NPRM for addressing the unsafe condition; and Do not add any additional burden upon the public than was already proposed in the NPRM.
The FAA also determined that these changes will not increase the economic burden on any operator or increase the scope of this final rule.
Related Service Information Under 1
CFR Part 51
EASA AD 20210024 describes procedures for a one-time detailed visual inspection of the wire bundles between the leftand right-hand AOA
probes and the crew alerting computer for discrepancies including, but not limited to, wire damage, missing or damaged conduits, and incorrect routing of wiring and conduits, and, depending on findings, applicable corrective actions. EASA AD 20210024 also describes procedures for modifying the captain stick shaker wiring, and amending the systems limitations section of the applicable AFM to incorporate procedures for the stick pusher/shaker. 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.
Costs of Compliance The FAA estimates that this AD
affects 26 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS

khammond on DSKJM1Z7X2PROD with RULES

Action Retained actions from AD
20202313.
New proposed actions

Labor cost
Cost per product
Parts cost
Up to 10 work-hours $85
per hour = Up to $850.
4 work-hours $85 per hour = $340.

Cost on U.S.
operators
$0

Up to $850

Up to $22,100.

$100

$440

$11,440.

Table does not include estimated costs for reporting.

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