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ACTION:

Federal Register / Vol. 86, No. 136 / Tuesday, July 20, 2021 / Rules and Regulations Final rule.

The FAA is adopting a new airworthiness directive AD for certain Bombardier, Inc., Model BD1001A10
airplanes. This AD was prompted by a report that certain airplanes have navigation units with outdated magnetic variation MagVar tables. This AD
requires revising the existing airplane flight manual AFM and applicable corresponding operational procedures to update the flight management system FMS limitations. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective August 24, 2021.
The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD
as of August 24, 2021.
ADDRESSES: For service information identified in this final rule, contact Bombardier, Inc., 200 Cote-Vertu Road West, Dorval, Quebec H4S 2A3, Canada;
North America toll-free telephone 18665381247 or direct-dial telephone 15148552999; email ac.yul@aero.bombardier.com; internet https www.bombardier.com. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195.
It is also available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210272.
SUMMARY:

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Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0272; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
The AD docket contains this final rule, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Thomas Niczky, Aerospace Engineer,
Avionics and Electrical Systems Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516
2287347; fax 5167945531; email 9avs-nyaco-cos@faa.gov.
SUPPLEMENTARY INFORMATION:
Background Transport Canada Civil Aviation TCCA, which is the aviation authority for Canada, has issued TCCA AD CF
202033, dated September 29, 2020
also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain Bombardier, Inc., Model BD1001A10 airplanes. You may examine the MCAI in the AD
docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0272.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain Bombardier, Inc., Model BD1001A10 airplanes. The NPRM
published in the Federal Register on April 12, 2021 86 FR 18921. The NPRM was prompted by a report that certain airplanes have navigation units with outdated MagVar tables. The NPRM proposed to require revising the existing AFM and applicable corresponding operational procedures to update the FMS limitations. 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. See the MCAI
for additional background information.
Comments The FAA gave the public the opportunity to participate in developing this final rule. The FAA received no comments on the NPRM or on the determination of the cost to the public.

Conclusion The FAA reviewed the relevant data and determined that air safety and the public interest require adopting this final rule as proposed, except for minor editorial changes. The FAA has determined that these minor changes:
Are consistent with the intent that was proposed in the NPRM for addressing the unsafe condition; and Do not add any additional burden upon the public than was already proposed in the NPRM.
Related Service Information Under 1
CFR Part 51
Bombardier has issued the following service information. This service information describes procedures for revising the existing AFM to update the FMS limitations. These documents are distinct since they apply to different airplane configurations.
Flight Management System FMS
limitation in Section 0204Systems Limitations, of Chapter 02Limitations, of the Bombardier Challenger 300
Airplane Flight Manual Imperial Version, Publication No. CSP 1001, Revision 58, dated January 15, 2020.
For obtaining the FMS limitation for Bombardier Challenger 300 Airplane Flight Manual Imperial Version, Publication No. CSP 1001, use Document Identification No. CH 300
AFMI.
FMS limitation in Section 0204
Systems Limitations, of Chapter 02
Limitations, of the Bombardier Challenger 300 Airplane Flight Manual Metric Version, Publication No. CSP
1001 Metric, Revision 58, dated January 15, 2020. For obtaining the FMS limitation for Bombardier Challenger 300 Airplane Flight Manual Metric Version, Publication No. CSP
1001 Metric, use Document Identification No. CH 300 AFMM.
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 section.
Costs of Compliance The FAA estimates that this AD
affects 318 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
1 work-hour $85 per hour = $85

$0

$85

$27,030

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