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Federal Register / Vol. 86, No. 47 / Friday, March 12, 2021 / Rules and Regulations
documents are distinct since they apply to different models.
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.
Other Related Service Information Eurocopter now Airbus Helicopters issued Service Bulletin SB BO10590
104, Revision 1, dated June 21, 2010, for certain Model BO105 helicopters. This service information specifies procedures for installing a retrofit ground connection of the starter-generator.
Eurocopter issued Alert Service Bulletin ASBBO 10580118, Revision 1, dated November 29, 1995, and Service Bulletin SBBO10580119, dated November 7, 1994, both for certain Model BO105 helicopters. This service information specifies retrofitting certain helicopters with voltage regulators that incorporate overvoltage protection by modifying the main relay box, modifying the overhead panel, and performing a functional test.
Eurocopter issued Information Notice 2370I24, Revision 0, dated November 15, 2011, for certain Model BO105
helicopters to provide notice that a modified starter-generator may only be installed on helicopters that have also been modified. This service information states that combining modified with non-modified can cause overvoltage in the electrical system during the first ground run following engine replacement and subsequent damage to electronic equipment. This service information also recommends retrofitting all helicopters approved to only fly under visual flight rules.
Differences Between This AD and the EASA ADs The EASA ADs require visually inspecting the wire terminals for damage, corrosion, and cracks. This AD
requires visually inspecting for a crack, a kink, fraying, looseness, missing material, and corrosion.
The EASA ADs require repeating the visual inspection and resistance measurement each time a startergenerator is removed or the wiring is disconnected from a starter-generator.
This AD does not because such a compliance time would be difficult to enforce.
EASA AD 20150220 requires additional actions for Model BO105
helicopters with a serial number up to 0160 than for helicopters with a serial number 0161 and larger. This AD
requires the same actions for all Model BO105 helicopters regardless of serial number.

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EASA AD 20150220 allows credit for complying with Eurocopter Alert Service Bulletin ASB BO10590103, Revision 2 or Revision 3, whereas this AD does not.
Costs of Compliance The FAA estimates that this AD
affects 40 Model BO105 helicopters and 44 Model MBBBK 117 helicopters of U.S. Registry. The FAA estimates that operators may incur the following costs in order to comply with this AD using an estimated labor cost of $85 per workhour.
Performing a visual inspection and resistance measurement of the electrical ground connection takes about 2 workhours for an estimated cost of $170 per helicopter and $14,280 for the U.S. fleet per inspection and measurement.
Performing the retrofit of the wiring harness takes about 10 work-hours.
Required parts for a Model BO105
helicopter cost $2,509 for an estimated replacement cost of $3,359 per helicopter and $134,360 for the U.S.
fleet. Required parts for a Model MBB
BK 117 helicopter cost $1,730 for an estimated replacement cost of $2,580
per helicopter and $113,520 for the U.S.
fleet. Revising the existing RFM for Model MBBBK 117 helicopters takes about 0.5 work-hour, for an estimated cost of $43 per helicopter and $1,892 for the U.S. fleet.
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 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
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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 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.
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:

20210507 Airbus Helicopters Deutschland GmbH Type Certificate Previously Held by Eurocopter Deutschland GmbH: Amendment 39
21450; Docket No. FAA20154497;
Project Identifier 2016SW011AD.
a Effective Date This airworthiness directive AD is effective April 16, 2021.
b Affected ADs None.
c Applicability This AD applies to the following Airbus Helicopters Deutschland GmbH Type Certificate previously held by Eurocopter Deutschland GmbH helicopters, certificated in any category:
1 Model BO105A, BO105C, and BO
105S helicopters with a voltage regulator part number P/N 51565000, 51565000R, or 51509002R installed; and 2 Model MBBBK 117 A1, MBBBK 117
A3, MBBBK 117 A4, MBBBK 117 B1, MBBBK 117 B2, and MBBBK 117 C1
helicopters.
d Subject Joint Aircraft Service Component JASC
Code: 2497, Electrical Power System Wiring.
e Unsafe Condition This AD was prompted by a report of a loss of electrical ground between the starter-

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