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Federal Register / Vol. 86, No. 130 / Monday, July 12, 2021 / Rules and Regulations at https www.regulations.gov by searching for and locating Docket No. FAA20210022.
k Material Incorporated by Reference None.
Issued on July 6, 2021.
Gaetano A. Sciortino, Deputy Director for Strategic Initiatives, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202114701 Filed 7921; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210541; Project Identifier AD202100453A; Amendment 3921639; AD 20211412
RIN 2120AA64

Airworthiness Directives; True Flight Holdings LLC Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Final rule; request for comments.
AGENCY:

The FAA is adopting a new airworthiness directive AD for all True Flight Holdings LLC Models AA1, AA
1A, AA1B, AA1C, and AA5
airplanes. This AD was prompted by the report of an accident of an airplane exhibiting bondline corrosion and delamination of the horizontal stabilizers. This AD requires inspecting the horizontal stabilizers, including the bondlines, for cracks, buckles, corrosion, delamination, rust, and previous repair and repairing or replacing parts and applying corrosion inhibitor as necessary. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective July 27, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of July 27, 2021.
The FAA must receive comments on this AD by August 26, 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: 202 4932251.
Mail: U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor,
khammond on DSKJM1Z7X2PROD with RULES

SUMMARY:

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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 service information identified in this final rule, contact True Flight Holdings LLC, 2300 Madison Highway, Valdosta, GA 31601; phone: 229 242
6337; email: info@
trueflightaerospace.com. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106. For information on the availability of this material at the FAA, call 816 3294148. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20210541.

structurally sound throughout the aging process, factors such as corrosion and freezing moisture may compromise the structural integrity of some of the bond joints. This can lead to delamination of the skin from the primary structure.
Field reports indicate that bondline inspections are not being adequately performed during routine inspections.
The FAA has determined that a more thorough inspection is necessary to reliably identify corrosion and delamination of bondlines in these critical areas, including the horizontal stabilizer.
This condition, if not addressed, could result in reduced structural integrity with consequent loss of control of the airplane. The FAA is issuing this AD to address the unsafe condition on these products.

Examining the AD Docket
FAAs Determination
You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210541; 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.
FOR FURTHER INFORMATION CONTACT: Fred Caplan, Aviation Safety Engineer, Atlanta ACO Branch, FAA, 1701
Columbia Avenue, College Park, GA
30337; phone: 404 4745507; fax: 404
4745606; email: frederick.n.caplan@
faa.gov.

The FAA is issuing this AD because the agency has determined the unsafe condition described previously is likely to exist or develop in other products of the same type design.

SUPPLEMENTARY INFORMATION:

Background The FAA received a report of an accident involving a True Flight Holdings LLC Model AA5 airplane that occurred on January 19, 2021. During flight, the outboard elevator attach bracket on the horizontal stabilizer detached causing loss of elevator control and significant damage to the airplane.
An investigation identified corrosion and delamination of the airplane skin bondlines around the area of the horizontal stabilizer where the elevator attach bracket was attached. Multiple field reports have identified additional instances of corrosion and delamination of skin bondlines around the horizontal stabilizer and other primary structures.
All Models AA1, AA1A, AA1B, AA1C, and AA5 Traveler airplanes have horizontal stabilizers that are similar in design and use the same attachment method for the elevators.
The affected airplanes are constructed using a metal-to-metal bonding process.
While the bond adhesive remains
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Related Service Information Under 1
CFR Part 51
The FAA reviewed True Flight Aerospace Service Bulletin SB195, Revision A, dated June 1, 2021 True Flight SB195, Revision A. This service information specifies procedures for inspecting the primary structure and flight controls for cracks, buckles, corrosion, delamination, rust, and previous repair and repairing or replacing parts and applying corrosion inhibitor as necessary.
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 ADDRESSES.
Other Related Service Information The FAA also reviewed True Flight Aerospace Service Kit 125, Revision B.
This service information specifies procedures for repairing bondline delamination of flight controls and structures.
AD Requirements This AD requires accomplishing the actions specified in the service information already described, except as discussed under Differences Between the AD and the Service Information.
Differences Between the AD and the Service Information True Flight SB195, Revision A
applies to Models AA1, AA1A, AA
1B, AA1C, AA5, AA5A, and AA5B
airplanes. However, this AD only
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