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Federal Register / Vol. 86, No. 177 / Thursday, September 16, 2021 / Proposed Rules ESTIMATED COSTS
Action
Labor cost
Inspect the stabilator tip tube and weight assembly.
Inspect the stabilator tip ribs.
Replace the stabilator tab forward rib/horn assemblies.
Install additional nose ribs
Parts cost
Cost on U.S.
operators
Cost per product
0.5 work-hour $85 per hour = $42.50.

Not applicable

$42.50 per inspection cycle.

$26,562.50 per inspection cycle.

0.5 work-hour $85 per hour = $42.50.
4 work-hours $85 per hour = $340.

Not applicable

$42.50

$26,562.50.

$817

$1,157

$723,125.

1 work-hour $85 per hour = $85.

$367

$452

$282,500.

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

ON-CONDITION COSTS
Cost per product
Action
Labor cost
Parts cost
Repair stabilator tip tube and weight assemblies airplanes without kit P/N
763 987.
Install missing stabilator tip rib rivets and/or the stabilator tip tube and weight assembly attachment screws.
Balance stabilator

4 work-hours $85 per hour = $340

$80

$420

1 work hour $85 per hour = $85

39

124

5 work-hours $85 per hour = $425

Not applicable

425

For airplanes with kit P/N 763 987, the cost to repair cracking may vary significantly from airplane to airplane, and therefore the FAA has no way of determining an estimated cost.
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 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 The FAA has determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not
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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 this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

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

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39.13

Amended
2. The FAA amends 39.13 by:
a. Removing Airworthiness Directive 780203 Reg. Docket No. 77EA81, Amendment 393128 43 FR 3079, January 23, 1978; and b. Adding the following new airworthiness directive:

Piper Aircraft, Inc.: Docket No. FAA2020
1006; Project Identifier 2019CE047
AD.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by November 1, 2021.
b Affected ADs This AD replaces AD 780203 Reg.
Docket No. 77EA81, Amendment 393128
43 FR 3079, January 23, 1978 AD 7802
03.
c Applicability This AD applies to Piper Aircraft, Inc., Model PA23250 airplanes, serial numbers 277654001 through 277954121, certificated in any category.
d Subject Joint Aircraft System Component JASC
Code 5510, Horizontal Stabilizer Structure.
e Unsafe Condition This AD was prompted by reports of cracks developing on the stabilator structure. The FAA is issuing this AD to prevent weakening of the stabilator structure and to detect and correct cracks on the stabilator tip tube and
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