Quiero saber acerca de...

61720

Federal Register / Vol. 86, No. 213 / Monday, November 8, 2021 / Proposed Rules
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210960; 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 NPRM, the MCAI, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT: Aziz Ahmed, Aviation Safety Engineer, New York ACO Branch, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; phone: 516 2287329; fax: 516
7945531; email: aziz.ahmed@faa.gov.
SUPPLEMENTARY INFORMATION:

lotter on DSK11XQN23PROD with PROPOSALS1

Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under the ADDRESSES section. Include Docket No. FAA20210960; Project Identifier 2019CE021AD at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend the proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this proposed AD.
Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be
VerDate Sep<11>2014

17:34 Nov 05, 2021

Jkt 256001

placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Aziz Ahmed, Aviation Safety Engineer, New York ACO Branch, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background The FAA issued AD 801310, Amendment 393812 45 FR 43155, June 26, 1980 AD 801310 for de Havilland type certificate now held by Viking Air Limited Model DHC6
type airplanes with certain MLG legs.
AD 801310 was prompted by several incidents involving collapse of the MLG. AD 801310 requires repetitively inspecting the weld juncture at the Yjoint of the MLG legs for cracks and corrosion. The FAA issued AD 8013
10 to prevent failure of the MLG legs at the Y-joint weld, which could result in wing damage during taxiing operations.
The FAA issued AD 801312 R1, Amendment 394135 46 FR 31251, June 15, 1981 AD 801312 R1 for certain serial-numbered de Havilland now Viking Air Limited Model DHC
6 type airplanes with intermediate or high floatation tires, skis, or floats. AD
801312 R1 was prompted by reports of cracks or buckling on the engine nacelle lower longerons. AD 801312
R1 requires repetitively inspecting each engine nacelle lower longeron for cracks and buckling. The FAA issued AD 80
1312 R1 to prevent possible failure of the engine nacelle lower longerons due to cracking or buckling.
The FAA issued AD 20080301, Amendment 3915350 73 FR 5729, January 31, 2008 AD 20080301, for all Viking Air Limited Model DHC61, DHC6100, DHC6200, and DHC6
300 airplanes. AD 20080301 was prompted by structural evaluations of the DHC6 series airplanes that showed the service life limits and inspection schedules needed to be revised. AD
20080301 was based on Canadian AD
CF200014, dated May 25, 2000 AD
CF200014, issued by Transport Canada, which is the aviation authority for Canada. AD 20080301 requires incorporating the inspections, modifications, and life limits retirement of certain structural components, as contained in Revision 5
of the DHC6 Product Support Manual PSM 1611, into the aircraft maintenance program. The FAA issued AD 20080301 to maintain the structural integrity of the airplane.

PO 00000

Frm 00003

Fmt 4702

Sfmt 4702

Actions Since AD 20080301 Was Issued Since the FAA issued AD 200803
01, Transport Canada has superseded AD CF200014 and issued Canadian AD CF201902, dated January 9, 2019
referred to after this as the MCAI.
The MCAI applies to all Viking Air Limited formerly de Havilland Model DHC6 series 1, DHC6 series 100, DHC6 series 110, DHC6 series 200, DHC6 series 210, DHC6 series 300, DHC6 series 310, DHC6 series 320, and DHC6 series 400 airplanes. The MCAI states:
The airworthiness limitations for DHC6
aeroplanes are defined and published in the Viking Air Ltd. Viking Airframe Airworthiness Limitations Manual, Product Support Manual PSM 1611, approved by Transport Canada. The instructions contained in PSM 1611 have been identified as mandatory actions for continued airworthiness. Failure to comply with those instructions could result in an unsafe condition.
Viking Air Ltd. published Revision 9 of PSM 1611 earlier in 2018. Revision 9 of PSM 1611, dated 30 April 2018, includes some new and/or more restrictive limitations than those contained in Revision 5. For the reason described above, this Transport Canada AD requires implementation of the actions specified in PSM 1611 Revision 9.
The compliance requirements for several of the tasks in PSM 1611 were previously a range of flight hours and flight cycles. With Revision 9 of PSM 1611, the range-based requirements have been changed to specific flight hours and flight cycle limits. This Transport Canada AD provides a phase-in allowance for those limitations so that operators will have the opportunity to schedule the modifications and inspections required by the limitations. The phase-in allowances are intended to mitigate the impact of changing from compliance ranges to compliance limits for aeroplanes that are approaching or have exceeded the limits on the effective date of the Transport Canada AD.
Revision 9 of PSM 1611 also includes some airworthiness limitations that were previously contained in service bulletins SB
or other PSMs. Some of those limitations were mandated by Transport Canada ADs, specifically AD CF8006, CF8107R4 and CF9512. Because the affected limitations will now be controlled in PSM 1611, the above mentioned Transport Canada ADs are superseded by this Transport Canada AD.
The following are new tasks in PSM 16
11 Revision 9:
1. Task 27007 Replacement of flight control pulleys at Fuselage Station FS 270.
2. Tasks 32001 and 32002 Overhaul of main landing gear leg. There is an associated requirement to ensure that each affected part has been assigned a unique serial number.
3. Task 53006 Inspection of the skin flange of machined frame at FS 239.
4. Tasks 54003 to 54010 Inspection of nacelle longerons.

E:FRFM08NOP1.SGM

08NOP1