Airworthiness Directives; Aviat Aircraft Inc., 49962-49965 [2020-17904]

Download as PDF 49962 Federal Register / Vol. 85, No. 159 / Monday, August 17, 2020 / Rules and Regulations DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2020–0715; Project Identifier AD–2020–00484–A; Amendment 39–21190; AD 2020–16–06] RIN 2120–AA64 Airworthiness Directives; Aviat Aircraft Inc. Federal Aviation Administration (FAA), DOT. ACTION: Final rule; request for comments. AGENCY: Examining the AD Docket The FAA is adopting a new airworthiness directive (AD) for all Aviat Aircraft Inc. Models A–1, A–1A, A–1B, A–1C–180, and A–1C–200 airplanes. This AD requires repetitive inspections of the forward horizontal stabilizer support assembly and the rear horizontal stabilizer support tube and reporting information to the FAA. This AD was prompted by field reports of complete failure of both the forward support assembly and the rear support tube due to fatigue. The FAA is issuing this AD to address the unsafe condition on these products. DATES: This AD is effective September 1, 2020. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of September 1, 2020. The FAA must receive comments on this AD by October 1, 2020. 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. • 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: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE, Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this final rule, contact Aviat Aircraft Inc., Al Humbert, 672 South SUMMARY: VerDate Sep<11>2014 16:18 Aug 14, 2020 Jkt 250001 Washington Street, Afton, WY, 83110, United States; phone: (307) 885–3151; email: dmir@aviataircraft.com; internet: https://aviataircraft.com. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, Missouri 64106. For information on the availability of this material at the FAA, call (816) 329– 4148. It is also available on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA–2020–0715. You may examine the AD docket on the internet at https:// www.regulations.gov by searching for and locating Docket No. FAA–2020– 0715; 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 street address for the Docket Operations is listed above. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Mark Dalrymple, Aerospace Engineer, Denver ACO Branch, FAA, 26805 E. 68th Avenue, Denver, CO 80249; phone: (303) 342–1090; email: mark.dalrymple@faa.gov. SUPPLEMENTARY INFORMATION: Discussion The FAA received three field reports from Aviat Aircraft Inc. of complete failure of the rear horizontal stabilizer inboard support tube. The first incident, discovered during a scheduled inspection, occurred in 2005, and the second incident, discovered while the airplane was being re-skinned, occurred in 2009. The third incident was discovered during a pre-flight inspection in 2012 and included a complete failure of the forward horizontal stabilizer inboard support assembly. Failure analysis of both parts from the 2012 incident concluded they failed due to fatigue. In addition to these complete failures of the rear support tube, the FAA received two field reports from Aviat Aircraft Inc. of cracks in the rear support tube, discovered during inspections, in 2005 and 2013. Aviat Aircraft Inc. subsequently issued Service Bulletin No. 28, Revision A, dated April 2, 2015, which requires a one-time inspection of the rear stabilizer inboard support tube in response to the multiple reports of failures and cracks. In addition to the 2012 incident, which involved a failure of both supports, the FAA received two other PO 00000 Frm 00022 Fmt 4700 Sfmt 4700 field reports from Aviat Aircraft Inc. of complete failure of the forward horizontal stabilizer inboard support assembly, one in 2000 and one in 2019. In the first incident, the failure occurred during ground handling after flight. In the second incident the failure was discovered while the aircraft was being placed in a hanger. Failure of either the forward or rear support transfers loads to the other support, increasing the likelihood that both could fail. This condition, if not addressed, could result in stabilizer departure and loss of airplane control. Related Service Information Under 1 CFR Part 51 The FAA reviewed Aviat Aircraft Inc. Service Bulletin No. 28, Revision A, dated April 2, 2015 (Aviat SB No. 28, Revision A). This service information contains procedures for inspecting and repairing the rear stabilizer support tube. This service information 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. FAA’s Determination The FAA is issuing this AD because it evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design. AD Requirements This AD requires inspection for cracks and replacement if necessary of the forward horizontal stabilizer support assembly. This AD also requires inspecting the rear horizontal stabilizer support tube for corrosion and damage and repair if necessary. This AD also requires reporting the inspection results to the FAA. FAA’s Justification and Determination of the Effective Date An unsafe condition exists that requires the immediate adoption of this AD without providing an opportunity for public comments prior to adoption. The FAA has found that the risk to the flying public justifies waiving notice and comment prior to adoption of this rule because FAA risk assessment indicates there is an unacceptable shortterm risk of developing fatigue cracks through 25 percent of the cross sectional area of the rear support tube on airplanes that have engaged in tow operations. In addition, further FAA risk assessment indicates there is an unacceptable short-term risk of developing fatigue cracks through 25 E:\FR\FM\17AUR1.SGM 17AUR1 Federal Register / Vol. 85, No. 159 / Monday, August 17, 2020 / Rules and Regulations percent of the cross sectional area of the forward support assembly on all airplanes. In the majority of known incidents at either location, the support failed completely. Failure of either the forward or rear support transfers loads to the other support, increasing the likelihood that both could fail, which has occurred in one known incident. A combined failure of both the forward and rear supports could result in stabilizer departure and loss of airplane control. Therefore, the FAA finds good cause that notice and opportunity for prior public comment are impracticable. In addition, for the reasons stated above, the FAA finds that good cause exists for making this amendment effective in less than 30 days. Comments Invited This AD is a final rule that involves requirements affecting flight safety and was not preceded by notice and an opportunity for public comment. However, we invite you to send any written data, views, or arguments about this final rule. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No.FAA– 2020–0715; Product Identifier AD– 2020–00484–A’’ at the beginning of your comments. The FAA will consider all comments received by the closing date and may amend this proposed AD because of those comments. 49963 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 we receive about this final rule. that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking. 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 we receive about this AD. 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 AD 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 AD, 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 they will not be placed in the public docket of this AD. Submissions containing CBI should be sent to Mark Dalrymple, Aerospace Engineer, Denver ACO Branch, FAA, 26805 E. 68th Avenue, Denver, CO 80249. Any commentary Differences Between This AD and the Service Information The service information only applies to certain serial numbers of the airplane models identified in this AD, while this AD applies to all serial numbers of Aviat Aircraft Inc. Model A–1, A–1A, A–1B, A–1C–180, and A–1C–200 airplanes. The service information only requires inspecting the rear stabilizer support tube, while this AD requires inspecting the forward stabilizer support assembly in addition to the rear stabilizer support tube. The service information only requires a one-time inspection, while this AD requires both initial and repetitive inspections. Costs of Compliance The FAA estimates that this AD affects 941 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD: ESTIMATED COSTS Action Labor cost Inspect forward horizontal stabilizer inboard support assembly for cracks. Inspect rear horizontal stabilizer inboard support tube weld joints for corrosion and damage. 1 work-hour × $85.00 per hour = $85.00. 0.5 work-hour × $85.00 per hour = $42.50. The FAA estimates the following costs to do any necessary repairs or replacements that would be required Parts cost based on the results of the inspection. The FAA has no way of determining the Cost per product Cost on U.S. operators $25.00 $110.00 $103,510.00 0.00 42.50 39,992.50 number of airplanes that might need these replacements: ON-CONDITION COSTS Action Labor cost Replace forward horizontal stabilizer support tube ....................... Repair rear horizontal stabilizer support tube weld joints and install new support tube insert. Report if cracks are found ............................................................. 2 work-hours × $85.00 per hour = $170.00 4.5 work-hours × $85.00 per hour = $382.50. 0.5 work-hour × $85.00 per hour = $42.50 Paperwork Reduction Act A federal agency may not conduct or sponsor, and a person is not required to respond to, nor shall a person be subject to a penalty for failure to comply with a collection of information subject to the VerDate Sep<11>2014 16:18 Aug 14, 2020 Jkt 250001 requirements of the Paperwork Reduction Act unless that collection of information displays a currently valid OMB Control Number. The OMB Control Number for this information collection is 2120–0056. Public reporting for this collection of PO 00000 Frm 00023 Fmt 4700 Sfmt 4700 Parts cost Cost per product $296.00 163.00 $466.00 545.50 0.00 42.50 information is estimated to be approximately .5 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, completing and reviewing the collection of information. All E:\FR\FM\17AUR1.SGM 17AUR1 49964 Federal Register / Vol. 85, No. 159 / Monday, August 17, 2020 / Rules and Regulations responses to this collection of information are mandatory. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to: Information Collection Clearance Officer, Federal Aviation Administration, 10101 Hillwood Parkway, Fort Worth, TX 76177–1524. Authority for This Rulemaking Title 49 of the United States Code specifies the FAA’s authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII: Aviation Programs describes in more detail the scope of the Agency’s authority. The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. Regulatory Flexibility Act The requirements of the Regulatory Flexibility Act (RFA) do not apply when an agency finds good cause pursuant to 5 U.S.C. 553 to adopt a rule without prior notice and comment. Because FAA has determined that it has good cause to adopt this rule without notice and comment, RFA analysis is not required. Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government. For the reasons discussed above, I certify that this AD: (1) Is not a ‘‘significant regulatory action’’ under Executive Order 12866, and (2) Will not affect intrastate aviation in Alaska. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. VerDate Sep<11>2014 16:18 Aug 14, 2020 Jkt 250001 Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: ■ Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new airworthiness directive (AD): ■ 2020–16–06 Aviat Aircraft Inc.: Amendment 39–21190; Docket No. FAA–2020–0715; Project Identifier AD– 2020–00484–A. (a) Effective Date This AD is effective September 1, 2020. (b) Affected ADs None. (c) Applicability This AD applies to Aviat Aircraft Inc., Models A–1, A–1A, A–1B, A–1C–180, and A–1C–200 airplanes, all serial numbers, certificated in any category. (d) Subject Joint Aircraft System Component (JASC)/ Air Transport Association (ATA) of America Code 5510, Horizontal Stabilizer Structure. (e) Unsafe Condition This AD was prompted by reports of complete failure of the forward horizontal stabilizer support assembly due to fatigue in combination with complete failure of the rear horizontal stabilizer support tube due to fatigue. The FAA is issuing this AD to prevent cracking of the forward and rear inboard supports, which could result in failure of the stabilizer supports, detachment of the stabilizer, and loss of airplane control. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Inspection and Repair For airplanes with 400 or more hours timein-service (TIS), do the following inspection within 30 days after September 1, 2020 (the effective date of this AD) or within 20 hours TIS after September 1, 2020 (the effective date of this AD), whichever occurs first. For airplanes with less than 400 hours TIS, do the following inspections within 30 days after accumulating 400 hours TIS or within 20 hours TIS after accumulating 400 hours TIS, whichever occurs first. After the initial inspection, repeat the inspections at intervals not to exceed 12 months or 100 hours TIS, whichever occurs first. (1) Below and just aft of the horizontal stabilizer leading edge, remove each inspection hole cover if installed, or cut out PO 00000 Frm 00024 Fmt 4700 Sfmt 4700 the inside of each inspection ring if not cut out, on both sides of the fuselage. You do not need to remove the stabilizer support assembly. Locate the forward horizontal stabilizer support assembly. Using a light and a mirror or a borescope, inspect the stabilizer support assembly for cracks in the large tube portion of the assembly. Pay particular attention to the toe of the welded bushings where the stabilizer support assembly is bolted to the fuselage frame. (i) If no cracks are found, install inspection hole cover, part number (P/N) 61659 and mounting screws, P/N 59146. (ii) If any cracks are found, before further flight, replace the stabilizer support assembly with the same part-numbered part, either P/ N 35086–501 or P/N 38086–501 as applicable. Replace both self-locking nuts with self-locking nuts that have zero hours TIS. Replacing the forward stabilizer support assembly requires removal and reinstallation of other horizontal stabilizer components. Replace all self-locking nuts with self-locking nuts that have zero hours TIS upon reinstallation of these components. (2) Inspect the rear horizontal stabilizer support tube weld joints for corrosion and damage in accordance with the Instructions, steps 1.a. and 1.b., of Aviat Aircraft Inc. Service Bulletin No. 28, Revision A, dated April 2, 2015. If there is any corrosion or damage on a weld joint, before further flight, repair the weld joint and install a repair tube inside the stabilizer support tube as depicted in the figure on page 3 of Aviat Aircraft Inc. Service Bulletin No. 28, Revision A, dated April 2, 2015. Repairing the rear horizontal stabilizer support tube requires removal and reinstallation of other horizontal stabilizer components. Replace all self-locking nuts with self-locking nuts that have zero hours TIS upon reinstallation of these components. (h) Reporting Requirement If a crack is found during any inspection required by paragraph (g) of this AD, within 10 days, report the following information to the FAA at the address listed in paragraph (l) of this AD: (1) Aircraft Make and Model (2) Aircraft N-number (3) Aircraft Serial Number (4) Total hours TIS (5) Total takeoff and landing cycles (if known) (6) Aircraft used for Tow operations? Yes or No (7) If the Aircraft is used for Tow operations, report heaviest Glider Max Gross takeoff weight or banner maximum weight. (8) Describe the crack location(s) and report the length of the crack(s) in the forward horizontal stabilizer support assembly, rear horizontal stabilizer support tube, or both. (i) Special Flight Permit In accordance with 14 CFR 39.23, special flight permits are prohibited. (j) Paperwork Reduction Act Burden Statement A federal agency may not conduct or sponsor, and a person is not required to respond to, nor shall a person be subject to a penalty for failure to comply with a E:\FR\FM\17AUR1.SGM 17AUR1 Federal Register / Vol. 85, No. 159 / Monday, August 17, 2020 / Rules and Regulations collection of information subject to the requirements of the Paperwork Reduction Act unless that collection of information displays a currently valid OMB Control Number. The OMB Control Number for this information collection is 2120–0056. Public reporting for this collection of information is estimated to be approximately .5 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, completing and reviewing the collection of information. All responses to this collection of information are mandatory. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to: Information Collection Clearance Officer, Federal Aviation Administration, 10101 Hillwood Parkway, Fort Worth, TX 76177–1524. (k) Alternative Methods of Compliance (AMOCs) (1) The Manager, Denver ACO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in paragraph (l) of this AD. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/ certificate holding district office. (l) Related Information For more information about this AD, contact Mark Dalrymple, Aerospace Engineer, Denver ACO Branch, FAA, 26805 E. 68th Avenue, Denver, CO 80249; phone: (303) 342–1090; email: mark.dalrymple@ faa.gov. (m) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise. (i) Aviat Aircraft Inc. Service Bulletin No. 28, Revision A, dated April 2, 2015. (ii) [Reserved] (3) For Aviat Aircraft Inc. service information identified in this AD, contact Aviat Aircraft Inc., Al Humbert, 672 South Washington Street, Afton, WY 83110, United States; phone: (307) 885–3151; email: dmir@ aviataircraft.com; internet: https:// aviataircraft.com. (4) You may view this service information at FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, Missouri 64106. For information on the availability of this material at the FAA, call 816–329–4148. (5) You may view this service information that is incorporated by reference at the National Archives and Records VerDate Sep<11>2014 16:18 Aug 14, 2020 Jkt 250001 Administration (NARA). For information on the availability of this material at NARA, email: fedreg.legal@nara.gov, or go to: https://www.archives.gov/federal-register/cfr/ ibr-locations.html. Issued on July 28, 2020. Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2020–17904 Filed 8–14–20; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF EDUCATION 34 CFR Part 75 and Chapter III Final Waiver and Extension of the Project Periods for the American Indian Vocational Rehabilitation Services Program Office of Special Education and Rehabilitative Services (OSERS), Department of Education. ACTION: Final waiver and extension of project periods. AGENCY: The U.S. Department of Education (Department) waives the requirements in the Education Department General Administrative Regulations that generally prohibit project periods exceeding five years and project period extensions involving the obligation of additional Federal funds. The waiver and extension enable 29 American Indian Vocational Rehabilitation Services (AIVRS) projects under Catalog of Federal Domestic Assistance (CFDA) number 84.250K to receive funding for an additional period, not beyond September 30, 2021. DATES: The waiver and extension of the project periods are effective August 17, 2020. FOR FURTHER INFORMATION CONTACT: August Martin, U.S. Department of Education, 400 Maryland Avenue SW, Room 5064A, Potomac Center Plaza, Washington, DC 20202–1800. Telephone: 202–245–7410. Email: August.Martin@ed.gov. If you use a telecommunications device for the deaf (TDD) or a text telephone (TTY), call the Federal Relay Service (FRS), toll free, at 1–800–877– 8339. SUPPLEMENTARY INFORMATION: SUMMARY: Background Under section 121(a) of the Rehabilitation Act of 1973, as amended (the Act), the purpose of the AIVRS program is to provide grants to the governing bodies of Indian Tribes located on Federal and State reservations (and consortia of such governing bodies) to pay 90 percent of PO 00000 Frm 00025 Fmt 4700 Sfmt 4700 49965 the costs of vocational rehabilitation (VR) services, including culturally appropriate services, to American Indians with disabilities who reside on or near Federal or State reservations, consistent with each eligible individual’s strengths, resources, priorities, concerns, abilities, capabilities, interests, and informed choice, so that each individual may prepare for, and engage in, high-quality employment that will increase opportunities for economic selfsufficiency. In fiscal year (FY) 2015, the Department published in the Federal Register (80 FR 18606) a notice inviting applications (NIA) announcing the grant competition for the AIVRS program under CFDA 84.250K. The Department funded 29 applications for a 60-month period that will expire as of September 30, 2020. Any AIVRS grantee seeking a new five-year grant award would typically apply and compete in a new grant competition during their fifth and final year of funding. On March 9, 2020, the Department published in the Federal Register (85 FR 13636) an NIA for the FY 2020 AIVRS competition, CFDA 84.250N (2020 NIA). Any new Tribes seeking an AIVRS grant along with the grantees whose grants are expiring on September 30, 2020 would need to submit an application in response to the FY 2020 NIA in order to receive an award that would start on October 1, 2020. At roughly the same time as the Department published the FY 2020 NIA, in early spring 2020, the effects of the COVID–19 pandemic began to be felt in the United States. American Indian reservations experienced and continue to experience high rates of COVID–19 infections. Many of the entities eligible for AIVRS grants across the country took actions to limit the spread of COVID–19 by requiring their non-essential personnel to shelter at home. We have been informed that many AIVRS personnel who continue to shelter-inplace at home to avoid exposure to COVID–19 have limited access to the necessary technology to telework, such as personal computers, Wi-Fi, or internet availability to connect to workplace servers or workplace resources, and we assume that would also be true of personnel who do not currently receive a grant but would be eligible to apply. This limits their ability to access the information needed to prepare a quality application for the FY 2020 AIVRS competition. In addition, we have been notified that some of the programs attempting to develop grant applications have had difficulty acquiring the Tribal resolutions needed E:\FR\FM\17AUR1.SGM 17AUR1

Agencies

[Federal Register Volume 85, Number 159 (Monday, August 17, 2020)]
[Rules and Regulations]
[Pages 49962-49965]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2020-17904]



[[Page 49962]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-0715; Project Identifier AD-2020-00484-A; 
Amendment 39-21190; AD 2020-16-06]
RIN 2120-AA64


Airworthiness Directives; Aviat Aircraft Inc.

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule; request for comments.

-----------------------------------------------------------------------

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all 
Aviat Aircraft Inc. Models A-1, A-1A, A-1B, A-1C-180, and A-1C-200 
airplanes.
    This AD requires repetitive inspections of the forward horizontal 
stabilizer support assembly and the rear horizontal stabilizer support 
tube and reporting information to the FAA. This AD was prompted by 
field reports of complete failure of both the forward support assembly 
and the rear support tube due to fatigue. The FAA is issuing this AD to 
address the unsafe condition on these products.

DATES: This AD is effective September 1, 2020.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of September 1, 
2020.
    The FAA must receive comments on this AD by October 1, 2020.

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.
     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: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE, Washington, DC 20590, between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays.
    For service information identified in this final rule, contact 
Aviat Aircraft Inc., Al Humbert, 672 South Washington Street, Afton, 
WY, 83110, United States; phone: (307) 885-3151; email: 
[email protected]; internet: https://aviataircraft.com. You may 
view this service information at the FAA, Airworthiness Products 
Section, Operational Safety Branch, 901 Locust, Kansas City, Missouri 
64106. For information on the availability of this material at the FAA, 
call (816) 329-4148. It is also available on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2020-
0715.

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. FAA-2020-
0715; 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 
street address for the Docket Operations is listed above. Comments will 
be available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Mark Dalrymple, Aerospace Engineer, 
Denver ACO Branch, FAA, 26805 E. 68th Avenue, Denver, CO 80249; phone: 
(303) 342-1090; email: mark.dalrym[email protected].

SUPPLEMENTARY INFORMATION: 

Discussion

    The FAA received three field reports from Aviat Aircraft Inc. of 
complete failure of the rear horizontal stabilizer inboard support 
tube. The first incident, discovered during a scheduled inspection, 
occurred in 2005, and the second incident, discovered while the 
airplane was being re-skinned, occurred in 2009. The third incident was 
discovered during a pre-flight inspection in 2012 and included a 
complete failure of the forward horizontal stabilizer inboard support 
assembly. Failure analysis of both parts from the 2012 incident 
concluded they failed due to fatigue. In addition to these complete 
failures of the rear support tube, the FAA received two field reports 
from Aviat Aircraft Inc. of cracks in the rear support tube, discovered 
during inspections, in 2005 and 2013. Aviat Aircraft Inc. subsequently 
issued Service Bulletin No. 28, Revision A, dated April 2, 2015, which 
requires a one-time inspection of the rear stabilizer inboard support 
tube in response to the multiple reports of failures and cracks.
    In addition to the 2012 incident, which involved a failure of both 
supports, the FAA received two other field reports from Aviat Aircraft 
Inc. of complete failure of the forward horizontal stabilizer inboard 
support assembly, one in 2000 and one in 2019. In the first incident, 
the failure occurred during ground handling after flight. In the second 
incident the failure was discovered while the aircraft was being placed 
in a hanger.
    Failure of either the forward or rear support transfers loads to 
the other support, increasing the likelihood that both could fail. This 
condition, if not addressed, could result in stabilizer departure and 
loss of airplane control.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed Aviat Aircraft Inc. Service Bulletin No. 28, 
Revision A, dated April 2, 2015 (Aviat SB No. 28, Revision A). This 
service information contains procedures for inspecting and repairing 
the rear stabilizer support tube. This service information 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.

FAA's Determination

    The FAA is issuing this AD because it evaluated all the relevant 
information and determined the unsafe condition described previously is 
likely to exist or develop in other products of the same type design.

AD Requirements

    This AD requires inspection for cracks and replacement if necessary 
of the forward horizontal stabilizer support assembly. This AD also 
requires inspecting the rear horizontal stabilizer support tube for 
corrosion and damage and repair if necessary. This AD also requires 
reporting the inspection results to the FAA.

FAA's Justification and Determination of the Effective Date

    An unsafe condition exists that requires the immediate adoption of 
this AD without providing an opportunity for public comments prior to 
adoption. The FAA has found that the risk to the flying public 
justifies waiving notice and comment prior to adoption of this rule 
because FAA risk assessment indicates there is an unacceptable short-
term risk of developing fatigue cracks through 25 percent of the cross 
sectional area of the rear support tube on airplanes that have engaged 
in tow operations. In addition, further FAA risk assessment indicates 
there is an unacceptable short-term risk of developing fatigue cracks 
through 25

[[Page 49963]]

percent of the cross sectional area of the forward support assembly on 
all airplanes. In the majority of known incidents at either location, 
the support failed completely. Failure of either the forward or rear 
support transfers loads to the other support, increasing the likelihood 
that both could fail, which has occurred in one known incident. A 
combined failure of both the forward and rear supports could result in 
stabilizer departure and loss of airplane control. Therefore, the FAA 
finds good cause that notice and opportunity for prior public comment 
are impracticable. In addition, for the reasons stated above, the FAA 
finds that good cause exists for making this amendment effective in 
less than 30 days.

Comments Invited

    This AD is a final rule that involves requirements affecting flight 
safety and was not preceded by notice and an opportunity for public 
comment. However, we invite you to send any written data, views, or 
arguments about this final rule. Send your comments to an address 
listed under the ADDRESSES section. Include ``Docket No.FAA-2020-0715; 
Product Identifier AD-2020-00484-A'' at the beginning of your comments. 
The FAA will consider all comments received by the closing date and may 
amend this proposed AD because of those comments.
    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 we receive about this final rule.

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 AD 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 AD, 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 they will not be placed in the public 
docket of this AD. Submissions containing CBI should be sent to Mark 
Dalrymple, Aerospace Engineer, Denver ACO Branch, FAA, 26805 E. 68th 
Avenue, Denver, CO 80249. Any commentary that the FAA receives which is 
not specifically designated as CBI will be placed in the public docket 
for this rulemaking.
    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 we receive about this AD.

Differences Between This AD and the Service Information

    The service information only applies to certain serial numbers of 
the airplane models identified in this AD, while this AD applies to all 
serial numbers of Aviat Aircraft Inc. Model A-1, A-1A, A-1B, A-1C-180, 
and A-1C-200 airplanes. The service information only requires 
inspecting the rear stabilizer support tube, while this AD requires 
inspecting the forward stabilizer support assembly in addition to the 
rear stabilizer support tube. The service information only requires a 
one-time inspection, while this AD requires both initial and repetitive 
inspections.

Costs of Compliance

    The FAA estimates that this AD affects 941 airplanes of U.S. 
registry.
    The FAA estimates the following costs to comply with this AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                Action                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Inspect forward horizontal stabilizer   1 work-hour x $85.00 per          $25.00         $110.00     $103,510.00
 inboard support assembly for cracks.    hour = $85.00.
Inspect rear horizontal stabilizer      0.5 work-hour x $85.00              0.00           42.50       39,992.50
 inboard support tube weld joints for    per hour = $42.50.
 corrosion and damage.
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any necessary repairs 
or replacements that would be required based on the results of the 
inspection. The FAA has no way of determining the number of airplanes 
that might need these replacements:

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                    Action                                 Labor cost               Parts cost        product
----------------------------------------------------------------------------------------------------------------
Replace forward horizontal stabilizer support   2 work-hours x $85.00 per hour =         $296.00         $466.00
 tube.                                           $170.00.
Repair rear horizontal stabilizer support tube  4.5 work-hours x $85.00 per hour          163.00          545.50
 weld joints and install new support tube        = $382.50.
 insert.
Report if cracks are found....................  0.5 work-hour x $85.00 per hour             0.00           42.50
                                                 = $42.50.
----------------------------------------------------------------------------------------------------------------

Paperwork Reduction Act

    A federal agency may not conduct or sponsor, and a person is not 
required to respond to, nor shall a person be subject to a penalty for 
failure to comply with a collection of information subject to the 
requirements of the Paperwork Reduction Act unless that collection of 
information displays a currently valid OMB Control Number. The OMB 
Control Number for this information collection is 2120-0056. Public 
reporting for this collection of information is estimated to be 
approximately .5 hour per response, including the time for reviewing 
instructions, searching existing data sources, gathering and 
maintaining the data needed, completing and reviewing the collection of 
information. All

[[Page 49964]]

responses to this collection of information are mandatory. Send 
comments regarding this burden estimate or any other aspect of this 
collection of information, including suggestions for reducing this 
burden to: Information Collection Clearance Officer, Federal Aviation 
Administration, 10101 Hillwood Parkway, Fort Worth, TX 76177-1524.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. Subtitle VII: Aviation Programs 
describes in more detail the scope of the Agency's authority.
    The FAA is issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701: General requirements. 
Under that section, Congress charges the FAA with promoting safe flight 
of civil aircraft in air commerce by prescribing regulations for 
practices, methods, and procedures the Administrator finds necessary 
for safety in air commerce. This regulation is within the scope of that 
authority because it addresses an unsafe condition that is likely to 
exist or develop on products identified in this rulemaking action.

Regulatory Flexibility Act

    The requirements of the Regulatory Flexibility Act (RFA) do not 
apply when an agency finds good cause pursuant to 5 U.S.C. 553 to adopt 
a rule without prior notice and comment. Because FAA has determined 
that it has good cause to adopt this rule without notice and comment, 
RFA analysis is not required.

Regulatory Findings

    This AD will not have federalism implications under Executive Order 
13132. This AD will not have a substantial direct effect on the States, 
on the relationship between the national government and the States, or 
on the distribution of power and responsibilities among the various 
levels of government.
    For the reasons discussed above, I certify that this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866, and
    (2) Will not affect intrastate aviation in Alaska.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13   [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive (AD):

2020-16-06 Aviat Aircraft Inc.: Amendment 39-21190; Docket No. FAA-
2020-0715; Project Identifier AD-2020-00484-A.

(a) Effective Date

    This AD is effective September 1, 2020.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to Aviat Aircraft Inc., Models A-1, A-1A, A-1B, 
A-1C-180, and A-1C-200 airplanes, all serial numbers, certificated 
in any category.

(d) Subject

    Joint Aircraft System Component (JASC)/Air Transport Association 
(ATA) of America Code 5510, Horizontal Stabilizer Structure.

(e) Unsafe Condition

    This AD was prompted by reports of complete failure of the 
forward horizontal stabilizer support assembly due to fatigue in 
combination with complete failure of the rear horizontal stabilizer 
support tube due to fatigue. The FAA is issuing this AD to prevent 
cracking of the forward and rear inboard supports, which could 
result in failure of the stabilizer supports, detachment of the 
stabilizer, and loss of airplane control.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Inspection and Repair

    For airplanes with 400 or more hours time-in-service (TIS), do 
the following inspection within 30 days after September 1, 2020 (the 
effective date of this AD) or within 20 hours TIS after September 1, 
2020 (the effective date of this AD), whichever occurs first. For 
airplanes with less than 400 hours TIS, do the following inspections 
within 30 days after accumulating 400 hours TIS or within 20 hours 
TIS after accumulating 400 hours TIS, whichever occurs first. After 
the initial inspection, repeat the inspections at intervals not to 
exceed 12 months or 100 hours TIS, whichever occurs first.
    (1) Below and just aft of the horizontal stabilizer leading 
edge, remove each inspection hole cover if installed, or cut out the 
inside of each inspection ring if not cut out, on both sides of the 
fuselage. You do not need to remove the stabilizer support assembly. 
Locate the forward horizontal stabilizer support assembly. Using a 
light and a mirror or a borescope, inspect the stabilizer support 
assembly for cracks in the large tube portion of the assembly. Pay 
particular attention to the toe of the welded bushings where the 
stabilizer support assembly is bolted to the fuselage frame.
    (i) If no cracks are found, install inspection hole cover, part 
number (P/N) 61659 and mounting screws, P/N 59146.
    (ii) If any cracks are found, before further flight, replace the 
stabilizer support assembly with the same part-numbered part, either 
P/N 35086-501 or P/N 38086-501 as applicable. Replace both self-
locking nuts with self-locking nuts that have zero hours TIS. 
Replacing the forward stabilizer support assembly requires removal 
and reinstallation of other horizontal stabilizer components. 
Replace all self-locking nuts with self-locking nuts that have zero 
hours TIS upon reinstallation of these components.
    (2) Inspect the rear horizontal stabilizer support tube weld 
joints for corrosion and damage in accordance with the Instructions, 
steps 1.a. and 1.b., of Aviat Aircraft Inc. Service Bulletin No. 28, 
Revision A, dated April 2, 2015. If there is any corrosion or damage 
on a weld joint, before further flight, repair the weld joint and 
install a repair tube inside the stabilizer support tube as depicted 
in the figure on page 3 of Aviat Aircraft Inc.
    Service Bulletin No. 28, Revision A, dated April 2, 2015. 
Repairing the rear horizontal stabilizer support tube requires 
removal and reinstallation of other horizontal stabilizer 
components. Replace all self-locking nuts with self-locking nuts 
that have zero hours TIS upon reinstallation of these components.

(h) Reporting Requirement

    If a crack is found during any inspection required by paragraph 
(g) of this AD, within 10 days, report the following information to 
the FAA at the address listed in paragraph (l) of this AD:
    (1) Aircraft Make and Model
    (2) Aircraft N-number
    (3) Aircraft Serial Number
    (4) Total hours TIS
    (5) Total takeoff and landing cycles (if known)
    (6) Aircraft used for Tow operations? Yes or No
    (7) If the Aircraft is used for Tow operations, report heaviest 
Glider Max Gross takeoff weight or banner maximum weight.
    (8) Describe the crack location(s) and report the length of the 
crack(s) in the forward horizontal stabilizer support assembly, rear 
horizontal stabilizer support tube, or both.

(i) Special Flight Permit

    In accordance with 14 CFR 39.23, special flight permits are 
prohibited.

(j) Paperwork Reduction Act Burden Statement

    A federal agency may not conduct or sponsor, and a person is not 
required to respond to, nor shall a person be subject to a penalty 
for failure to comply with a

[[Page 49965]]

collection of information subject to the requirements of the 
Paperwork Reduction Act unless that collection of information 
displays a currently valid OMB Control Number. The OMB Control 
Number for this information collection is 2120-0056. Public 
reporting for this collection of information is estimated to be 
approximately .5 hour per response, including the time for reviewing 
instructions, searching existing data sources, gathering and 
maintaining the data needed, completing and reviewing the collection 
of information. All responses to this collection of information are 
mandatory. Send comments regarding this burden estimate or any other 
aspect of this collection of information, including suggestions for 
reducing this burden to: Information Collection Clearance Officer, 
Federal Aviation Administration, 10101 Hillwood Parkway, Fort Worth, 
TX 76177-1524.

(k) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Denver ACO Branch, FAA, has the authority to 
approve AMOCs for this AD, if requested using the procedures found 
in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request 
to your principal inspector or local Flight Standards District 
Office, as appropriate. If sending information directly to the 
manager of the certification office, send it to the attention of the 
person identified in paragraph (l) of this AD.
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
district office.

(l) Related Information

    For more information about this AD, contact Mark Dalrymple, 
Aerospace Engineer, Denver ACO Branch, FAA, 26805 E. 68th Avenue, 
Denver, CO 80249; phone: (303) 342-1090; email: 
[email protected].

(m) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference of the service information listed in this 
paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this service information as applicable to do 
the actions required by this AD, unless the AD specifies otherwise.
    (i) Aviat Aircraft Inc. Service Bulletin No. 28, Revision A, 
dated April 2, 2015.
    (ii) [Reserved]
    (3) For Aviat Aircraft Inc. service information identified in 
this AD, contact Aviat Aircraft Inc., Al Humbert, 672 South 
Washington Street, Afton, WY 83110, United States; phone: (307) 885-
3151; email: [email protected]; internet: https://aviataircraft.com.
    (4) You may view this service information at FAA, Airworthiness 
Products Section, Operational Safety Branch, 901 Locust, Kansas 
City, Missouri 64106. For information on the availability of this 
material at the FAA, call 816-329-4148.
    (5) You may view this service information that is incorporated 
by reference at the National Archives and Records Administration 
(NARA). For information on the availability of this material at 
NARA, email: [email protected], or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on July 28, 2020.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification 
Service.
[FR Doc. 2020-17904 Filed 8-14-20; 8:45 am]
BILLING CODE 4910-13-P