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Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Rules and Regulations airplanes without the proper stall warning heater modification design change. In the NPRM, the FAA
proposed to require identifying and correcting nonconforming stall warning heat control systems.
The FAA issued AD 20082611, Amendment 3915777 73 FR 78934, December 24, 2008 AD 20082611
for certain serial-numbered Piper Model PA46350P, PA46R350T, and PA
46500TP airplanes. AD 20082611
requires installing stall warning heat control modification kit part number 88452002. For those serial-numbered airplanes to which AD 20082611 does not apply, Piper incorporated the modification kit in production.
Since the FAA issued AD 200826
11, Piper found 11 airplanes 9
domestic with the left wing replaced with a wing assembly from salvage that did not have the proper stall warning heater modification design change.
Without the proper stall warning heat control modification kit during flights into icing conditions with the landing gear down, ice can form on the stall vane, which may result in failure of the stall warning system. The FAA is issuing this AD to address the unsafe condition on these products.

This action will not affect AD 2008
2611 and all actions of that AD will remain in place.
Discussion of Final Airworthiness Directive Comments The FAA received a comment from 1
commenter. The commenter supported the NPRM without change.
Conclusion The FAA reviewed the relevant data, considered the comments received, and determined that air safety requires adopting the AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for minor editorial changes, this AD is adopted as proposed in the NPRM.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Piper Service Letter No. 1261, dated July 19, 2019.
This service information specifies procedures to identify and correct nonconforming stall warning heat control systems. The intent of these service letters is to ensure that wiring for the stall warning heat control system meets current type design. This service information is reasonably available
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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 reviewed Piper Mandatory Service Bulletin No. 1192, dated September 15, 2008. This service bulletin is incorporated by reference in AD 20082611.
Differences Between This AD and the Service Information This AD does not require the first step, which is identified as a required for compliance RC step, of Piper Service Letter No. 1261, dated July 19, 2019. The first step specifies reviewing the aircraft records to determine whether the inspection of the stall warning heat control configuration must be done. This AD does not require a records review. Instead, all airplanes identified in the applicability of this AD
have to inspect the stall warning heat control configuration.
Costs of Compliance The FAA estimates that this AD will affect 1,261 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Action
Labor cost
Inspect stall warning heat control system

1 work-hour $85 per hour = $85

The FAA estimates the following costs to do any necessary repairs that
Cost per product
Parts cost
will be required based on the results of the inspection. The FAA has no way of
$0

$85

Cost on U.S.
operators $107,185

determining the number of airplanes that might need these repairs:

ON-CONDITION COSTS
Action
Labor cost
Install modification kit

1.5 work-hours $85 per hour = $127.50

The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected individuals.
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
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Parts cost $230.00

Cost per product $357.50

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.
For the reasons discussed above, I
certify that this AD:

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