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Federal Register / Vol. 86, No. 136 / Tuesday, July 20, 2021 / Rules and Regulations 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
khammond on DSKJM1Z7X2PROD with RULES

15:59 Jul 19, 2021

List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
Adoption of 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

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

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:
1 Is not a significant regulatory action under Executive Order 12866, 2 Will not affect intrastate aviation in Alaska, and
VerDate Sep<11>2014

3 Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

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20211401 Bombardier, Inc.: Amendment 3921628; Docket No. FAA20210272;
Project Identifier MCAI202001485T.
a Effective Date This airworthiness directive AD is effective August 24, 2021.
b Affected ADs None.
c Applicability This AD applies to Bombardier, Inc., Model BD1001A10 airplanes, certificated
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in any category, serial numbers 20003
through 20407 inclusive, equipped with FMC5000 flight management computers.
d Subject Air Transport Association ATA of America Code 34, Navigation.
e Unsafe Condition This AD was prompted by a report that certain airplanes have navigation units with outdated magnetic variation MagVar tables.
The FAA is issuing this AD to address outdated MagVar tables inside navigation systems, which can affect the performance of the navigation systems and result in the presentation of misleading magnetic heading references on the primary flight displays PFDs and multi-function displays MFDs, positioning the airplane outside of the terrain and obstacle protection provided by instrument flight procedures and flight route designs, and can lead to significantly inaccurate heading, course, and bearing calculations.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Revision of the Airplane Flight Manual AFM
Within 60 days after the effective date of this AD: Revise the existing AFM and applicable corresponding operational procedures to incorporate the information specified in the Flight Management System FMS limitation in Section 0204Systems Limitations, of Chapter 02Limitations, of the applicable AFM, specified in figure 1 to paragraph g of this AD.

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