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Federal Register / Vol. 86, No. 231 / Monday, December 6, 2021 / Rules and Regulations
condition, if not addressed, could result in failure of the wing centerline joint and lead to partial wing separation with consequent loss of control of the airplane.
Discussion of Final Airworthiness Directive Comments The FAA received one comment from an individual. The following presents the comment received on the NPRM and the FAAs response to the comment.
An individual requested the FAA
allow credit for previous visual inspections using Inspection Reference Number IRN 5710190. The commenter stated that IRN 5710190 requires the same inspection as the applicable service bulletin. The commenter noted that while some operators might not have used the service bulletin listed in paragraph k of the NPRM, operators of aircraft over 8 years old will have used IRN 5710190.
The FAA agrees and has added the applicable maintenance manual references for IRN 5710190 to paragraph k of this AD, which provides credit for previous actions.

Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for the changes described previously, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
Related Service Information Under 1
CFR Part 51
The FAA reviewed the following service documents required for compliance with this AD:
Bombardier Learjet 40 Service Bulletin 405706, Revision 1, dated October, 26, 2020;
Bombardier Learjet 45 Service Bulletin 455713, Revision 1, dated October, 26, 2020;
Bombardier Learjet 70 Service Bulletin 705702, Revision 1, dated October, 26, 2020; and Bombardier Learjet 75 Service Bulletin 755701, Revision 2, dated April 19, 2021.

As applicable to the model configuration specified, each service bulletin contains procedures for inspecting for corrosion and deterioration of protective treatments of the center wing area from the front spar to the rear spar between wing stations 33.00L to 33.00R, treating deteriorated areas, and removing any corrosion.
Bombardier Learjet 75 Service Bulletin 755701, Revision 2, dated April 19, 2021, does not apply to newlymanufactured airplanes, since Learjet added this inspection to the Airworthiness Limitation Section, which will be delivered with new airplanes starting at S/N 45597.
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.
Costs of Compliance The FAA estimates that this AD
affects 450 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Cost on U.S.
operators
Labor cost
Parts Cost
Inspect

7.5 work-hours $85 per hour =
$637.50.
1 work-hours $85 per hour = $85

Not applicable

$637.50

$286,875

Not applicable

85

38,250

Report to FAA

The extent of corrosion and deterioration of protective treatments may vary significantly from airplane to airplane. The FAA has no way of determining how much damage may be found on each airplane, the cost to remove the corrosion or treat deteriorated areas or replacing the part, if needed, or the number of airplanes that may require repair.
If corrosion is found and removed, the FAA estimates that it would take 2
work-hours per airplane to provide data to Learjet. With an average labor rate of $85 per work-hour, the FAA estimates a cost of $170 per airplane.
Paperwork Reduction Act
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Cost per product
Action
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
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collection is 21200056. Public reporting for this collection of information is estimated to take approximately 3 hours per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and 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 761771524.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs 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
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detail the scope of the Agencys 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 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.

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