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Federal Register / Vol. 86, No. 234 / Thursday, December 9, 2021 / Rules and Regulations adopt this rule without prior notice and comment, RFA analysis is not required.
Impact on Intrastate Aviation in Alaska For the reasons discussed above, this AD will not affect intrastate aviation in Alaska.
Costs of Compliance The FAA estimates that this AD
affects 1,828 helicopters of U.S. registry.
Labor rates are estimated at $85 per work-hour. Based on these numbers, the FAA estimates the following costs to comply with this AD.
Revising the existing RFM for your helicopter would take about 1 workhour for an estimated cost of $85 per helicopter or $155,380 for the U.S. fleet.

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As previously discussed, there may be other impacts to aviation; however there remains uncertainty as to cost due to various factors such as which areas within the United States have, or will have, base stations or other devices that could interfere with aircraft radio altimeters.

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.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 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.
39.13

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.

This airworthiness directive AD is effective December 9, 2021.

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Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20212313 Various Helicopters:
Amendment 3921811; Docket No.
FAA20210954; Project Identifier AD
202101170R.
a Effective Date
b Affected ADs None.
c Applicability This AD applies to all helicopters, certificated in any category, equipped with a radio also known as radar altimeter. These radio altimeters are installed on various helicopter models including, but not limited to, the helicopters for which the design approval holder is identified in paragraphs c1 through 20 of this AD.
1 Airbus Helicopters
PO 00000

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2 Airbus Helicopters Deutschland GmbH
3 Air Space Design and Manufacturing, LLC
4 Bell Textron Canada Limited 5 Bell Textron Inc.
6 Brantly International, Inc.
7 Centerpointe Aerospace Inc.
8 Columbia Helicopters, Inc.
9 The Enstrom Helicopter Corporation 10 Erickson Air-Crane Incorporated, DBA
Erickson Air-Crane 11 Helicopteres Guimbal 12 Siam Hiller Holdings, Inc.
13 Kaman Aerospace Corporation 14 Leonardo S.p.a.
15 MD Helicopters Inc.
16 PZL Swidnik S.A.
17 Robinson Helicopter Company 18 Schweizer RSG LLC
19 Scotts-Bell 47 Inc.
20 Sikorsky Aircraft Corporation d Subject Joint Aircraft Service Component JASC
Code: 3444, Ground Proximity System.
e Unsafe Condition
Authority for This Rulemaking
VerDate Sep<11>2014

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This AD was prompted by a determination that radio altimeters cannot be relied upon to perform their intended function if they experience interference from wireless broadband operations in the 3.73.98 GHz frequency band 5G C-Band. The FAA is issuing this AD because radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground, could lead to loss of continued safe flight and landing.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Rotorcraft Flight Manual RFM Revision On or before January 4, 2022: Revise the Limitations Section of the existing RFM for your helicopter by incorporating the limitations specified in figure 1 to paragraph g of this AD. This may be done by inserting a copy of this AD into the existing RFM for your helicopter. The action required by this paragraph may be performed by the owner/
operator pilot holding at least a private pilot certificate and must be entered into the aircraft records showing compliance with this AD in accordance with 14 CFR 43.9a1
through 4 and 14 CFR 91.417a2v. The record must be maintained as required by 14
CFR 91.417 or 14 CFR 135.439.

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