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Federal Register / Vol. 86, No. 35 / Wednesday, February 24, 2021 / Proposed Rules
by searching for and locating Docket No.
FAA20210097.
This proposed AD was prompted by reports of DCMP failures during production flight tests. These failures caused the electrical system generators to disconnect due to excessive induced voltage in the bus, caused by the DCMP
overheating at high altitudes. The FAA
is proposing this AD to address failures of the DCMP and electrical system generators, which could lead to the loss of normal electrical power on the airplane. See the MCAI for additional background information.
Related Service Information Under 1
CFR Part 51
Bombardier has issued Service Bulletin 1002918, Revision 03, dated December 18, 2014. This service
information describes procedures for installing the redesigned DCMP electric motor assembly, having part number P/
N 9452023 including a wiring modification and a structural modification.
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.
FAAs Determination This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition described in the MCAI and service
information referenced above. The FAA
is proposing this AD because the FAA
evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Proposed Requirements of This NPRM
This proposed AD would require accomplishing the actions specified in the service information described previously.
Costs of Compliance The FAA estimates that this proposed AD affects 239 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this proposed AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
68 work-hours $85 per hour = $5,780

$18,964

$24,744

$5,913,816

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.

khammond on DSKJM1Z7X2PROD with PROPOSALS

Regulatory Findings
16:41 Feb 23, 2021

b Affected ADs
List of Subjects in 14 CFR Part 39

Air Transport Association ATA of America Code 29, Hydraulic power.

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.

The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 this proposed regulation:

VerDate Sep<11>2014

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.

Jkt 253001

39.13

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

Bombardier, Inc.: Docket No. FAA2021
0097; Project Identifier MCAI2020
01334T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD action by April 12, 2021.

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None.
c Applicability This AD applies to Bombardier, Inc., Model BD1001A10 airplanes, certificated in any category, serial numbers 20003
through 20406 inclusive.
d Subject
e Reason This AD was prompted by reports of DC
motor pump DCMP failures during production flight tests. These failures caused the electrical system generators to disconnect due to excessive induced voltage in the bus, caused by the DCMP overheating at high altitudes. The FAA is issuing this AD to address failures of the DCMP and electrical system generators, which could lead to the loss of normal electrical power on the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions Within 6 months after the effective date of this AD: Install the redesigned DCMP electric motor assembly, having part number P/N
9452023, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 1002918, Revision 03, dated December 18, 2014.
h Parts Installation Prohibition After accomplishing the installation required by paragraph g of this AD, no
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