Voglio sapere a riguardo di…

28480

Federal Register / Vol. 86, No. 101 / Thursday, May 27, 2021 / Rules and Regulations Related Service Information Under 1
CFR Part 51

Conclusion The FAA reviewed the relevant data, considered the comment received, 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.

De Havilland Aircraft of Canada Limited has issued Service Bulletin 84
32162, Revision B, dated November 13, 2019, including UTC Aerospace Systems Service Bulletin 40630032
142, dated June 24, 2019; and UTC
Aerospace Systems Service Bulletin 40633032143, dated June 24, 2019.
This service information describes procedures for modifying the NWS
system terminating wiring, reworking
the left-hand console frame, and installing an NWS electronic control unit and NWS hand control. 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 54 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Parts cost
Cost per product
Modification

13 work-hours $85 per hour = $1,105

Up to $122

Up to $1,227 ..

jbell on DSKJLSW7X2PROD with RULES

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 The FAA determined that 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 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.

VerDate Sep<11>2014

16:14 May 26, 2021

Jkt 253001

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:
a. Removing Airworthiness Directive AD 20151708, Amendment 39
18241 80 FR 51459, August 25, 2015;
and b. Adding the following new AD:

20211013 De Havilland Aircraft of Canada Limited Type Certificate Previously Held by Bombardier, Inc.:
Amendment 3921546; Docket No.
FAA20210018; Project Identifier MCAI202001214T.
a Effective Date This airworthiness directive AD is effective July 1, 2021.
b Affected ADs This AD replaces AD 20151708, Amendment 3918241 80 FR 51459, August 25, 2015 AD 20151708.
c Applicability This AD applies to De Havilland Aircraft of Canada Limited Model DHC8401 and 402 airplanes, certificated in any category, serial numbers 4001, and 4003 through 4608
inclusive.

PO 00000

Frm 00012

Fmt 4700

Sfmt 4700

Cost on U.S.
operators Up to $66,258.

d Subject Air Transport Association ATA of America Code 32, Landing gear.
e Reason This AD was prompted by a report indicating that several failure modes of the nose wheel steering NWS system may cause the loss of feedback from both rotary variable differential transformers to the steering control unit. The FAA is issuing this AD to address failure modes of the NWS system, which could lead to NWS runaway, loss of directional control of the airplane, and possible consequent runway excursion.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g New Requirement of This AD
Within 4,000 flight hours or 18 months, whichever occurs first after the effective date of this AD: Perform modifications to the NWS system, in accordance with paragraph 3.B of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 8432162, Revision B, dated November 13, 2019, including UTC
Aerospace Systems Service Bulletin 406300
32142, dated June 24, 2019; and UTC
Aerospace Systems Service Bulletin 406330
32143, dated June 24, 2019.
h Credit for Previous Actions This paragraph provides credit for actions required by paragraph g of this AD, if those actions were performed before the effective date of this AD using De Havilland Aircraft of Canada Limited Service Bulletin 8432
162, dated August 26, 2019, including UTC
Aerospace Systems Service Bulletin 406300
32142, dated June 24, 2019, and UTC
Aerospace Systems Service Bulletin 406330
32143, dated June 24, 2019; or De Havilland Aircraft of Canada Limited Service Bulletin 8432162, Revision A, dated October 18, 2019, including UTC Aerospace Systems Service Bulletin 40630032142, dated June 24, 2019, and UTC Aerospace Systems
E:FRFM27MYR1.SGM

27MYR1