Federal Register / Vol. 87, No. 68 / Friday, April 8, 2022 / Rules and Regulations 20701 

Requirements Bulletin 747–31A2565 RB, 

dated April 27, 2021. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Seattle ACO Branch, 

FAA, has the authority to approve AMOCs 

for this AD, if requested using the procedures 

found in 14 CFR 39.19. In accordance with 

14 CFR 39.19, send your request to your 

principal inspector or responsible Flight 

Standards Office, as appropriate. If sending 

information directly to the manager of the 

certification office, send it to the attention of 

the person identified in Related Information. 

Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the responsible Flight Standards Office. 

(3) An AMOC that provides an acceptable 

level of safety may be used for any repair, 

modification, or alteration required by this 

AD if it is approved by The Boeing Company 

Organization Designation Authorization 

(ODA) that has been authorized by the 

Manager, Seattle ACO Branch, FAA, to make 

those findings. To be approved, the repair 

method, modification deviation, or alteration 

deviation must meet the certification basis of 

the airplane, and the approval must 

specifically refer to this AD. 

(k) Related Information 

(1) For more information about this AD, 

contact Jeffrey Palmer, Aerospace Engineer, 

Systems and Equipment Section, FAA, Los 

Angeles ACO Branch, 3960 Paramount 

Boulevard, Lakewood, CA 90712–4137; 

phone: 562–627–5351; email: 

jeffrey.w.palmer@faa.gov. 

(2) For information about AMOCs, contact 

Frank Carreras, Aerospace Engineer, Systems 

and Equipment Section, FAA, Seattle ACO 

Branch, 2200 South 216th St., Des Moines, 

WA 98198; phone and fax: 206–231–3539; 

email: frank.carreras@faa.gov. 

(3) Service information identified in this 

AD that is not incorporated by reference is 

available at the addresses specified in 

paragraphs (l)(3) and (4) of this AD. 

(l) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) of the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless the AD specifies otherwise. 

(i) Boeing Alert Requirements Bulletin 

747–31A2565 RB, Revision 1, dated 

September 14, 2021. 

(ii) [Reserved] 

(3) For service information identified in 

this AD, contact Boeing Commercial 

Airplanes, Attention: Contractual & Data 

Services (C&DS), 2600 Westminster Blvd., 

MC 110–SK57, Seal Beach, CA 90740–5600; 

telephone 562–797–1717; internet https://

www.myboeingfleet.com. 

(4) 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 

206–231–3195. 

(5) You may view this service information 

that is incorporated by reference at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

fr.inspection@nara.gov, or go to: https://

www.archives.gov/federal-register/cfr/ibrlocations.html. 

Issued on March 17, 2022. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–07414 Filed 4–7–22; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2022–0007; Project 

Identifier 2018–CE–048–AD; Amendment 

39–22002; AD 2022–07–14] 

RIN 2120–AA64 

Airworthiness Directives; Viking Air 

Limited (Type Certificate Previously 

Held by Bombardier Inc. and de 

Havilland, Inc.) Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Viking Air Limited (type certificate 

previously held by Bombardier Inc. and 

de Havilland, Inc.) Model DHC–6–400 

airplanes. This AD was prompted by 

mandatory continuing airworthiness 

information (MCAI) originated by an 

aviation authority of another country to 

identify and correct an unsafe condition 

on an aviation product. The MCAI 

describes the unsafe condition as 

corrosion of the fuel system components 

located in the fuel gallery due to 

inadequate corrosion protection. This 

AD requires repetitively inspecting the 

fuel gallery for corrosion, rectifying any 

deficiencies, and accomplishing 

modifications to the fuel gallery system. 

The FAA is issuing this AD to address 

the unsafe condition on these products. 

DATES: This AD is effective May 13, 

2022. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of May 13, 2022. 

ADDRESSES: For service information 

identified in this final rule, contact 

Viking Air Limited Technical Support, 

1959 de Havilland Way, Sidney, British 

Columbia, Canada, V8L 5V5; phone: 

(North America) (800) 663–8444; fax: 

(250) 656–0673; email: 

technical.support@vikingair.com; 

website: https://www.vikingair.com/ 

support/service-bulletins. You may view 

this service information at the FAA, 

Airworthiness Products Section, 

Operational Safety Branch, 901 Locust, 

Kansas City, MO 64106. For information 

on the availability of this material at the 

FAA, call (817) 222–5110. Service 

information that is incorporated by 

reference is also available at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2022– 

0007. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2022–0007; 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, the MCAI, any comments 

received, and other information. The 

address for Docket Operations is U.S. 

Department of Transportation, Docket 

Operations, M–30, West Building 

Ground Floor, Room W12–140, 1200 

New Jersey Avenue SE, Washington, DC 

20590. 

FOR FURTHER INFORMATION CONTACT: 

Joseph Catanzaro, Aviation Safety 

Engineer, New York ACO Branch, FAA, 

1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; phone: (516) 228– 

7366; email: joseph.catanzaro@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to certain serial-numbered Viking 

Air Limited (type certificate previously 

held by Bombardier Inc. and de 

Havilland, Inc.) Model DHC–6–400 

airplanes. The NPRM published in the 

Federal Register on January 21, 2022 

(87 FR 3238). The NPRM was prompted 

by MCAI originated by Transport 

Canada, which is the aviation authority 

for Canada. Transport Canada issued AD 

CF–2018–07, dated February 23, 2018 

(referred to after this as ‘‘the MCAI’’), to 

address an unsafe condition on certain 

serial-numbered Viking Air Limited 

Model DHC–6–400 airplanes. The MCAI 

states: 

There have been reports of corrosion 

affecting components of the fuel system that 

are located in the fuel gallery because of 

inadequate corrosion protection. This 

condition affects only aeroplanes operating 

on floats. 

The effects of corrosion-related damage to 

fuel system components have included fuel 


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20702 Federal Register / Vol. 87, No. 68 / Friday, April 8, 2022 / Rules and Regulations 

leaks, electrical arcing, loss of fuel boost 

pump function and erroneous fuel quantity 

readings. Inaccurate fuel quantity indication 

and loss of fuel boost pump function can lead 

to fuel starvation followed by loss of engine 

power. Electrical arcing in the fuel gallery 

and loss of electrical bonding between fuel 

system components increases the risk of fire. 

The MCAI requires repetitively 

inspecting the fuel gallery for corrosion, 

rectifying any deficiencies, and 

accomplishing modifications to the fuel 

gallery system. You may examine the 

MCAI in the AD docket at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2022– 

0007. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received one comment on 

the NPRM from an individual. The 

commenter supported the NPRM 

without change. 

Conclusion 

These products have been approved 

by the aviation authority of another 

country and are approved for operation 

in the United States. Pursuant to the 

FAA’s bilateral agreement with this 

State of Design Authority, it has notified 

the FAA of the unsafe condition 

described in the MCAI referenced 

above. The FAA reviewed the relevant 

data, considered the comment received, 

and determined that air safety requires 

adopting this AD as proposed. 

Accordingly, the FAA is issuing this AD 

to address the unsafe condition on these 

products. This AD is adopted as 

proposed in the NPRM. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Viking DHC–6 

Twin Otter Service Bulletin No. V6/ 

0044, Revision B, dated September 13, 

2021. The service information specifies 

incorporating multiple design 

improvement modifications in the fuel 

gallery. 

The FAA also reviewed Temporary 

Revision No. 241, dated July 27, 2021, 

to the Viking DHC–6 Inspection 

Requirements Manual, PSM 1–6–7. 

Items 15.(1) and 15.(2) of this service 

information specify rinsing and 

inspecting the entire fuel gallery for 

corrosion; removing corrosion; 

reapplying any protective finishes; and 

removing and replacing any damaged 

components. The temporary revision 

updates the fuel gallery inspection to 

include airplanes with a new fuel probe 

(Modification (MOD) 6/2395). 

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 

The FAA reviewed the following 

technical bulletins, which contain 

instructions for the different 

modifications to components in the fuel 

gallery: 

• Viking DHC–6 Twin Otter 

Technical Bulletin No. TBV6/00034, 

Revision NC, dated October 16, 2013 

(MOD 6/2267); 

• Viking DHC–6 Twin Otter 

Technical Bulletin No. TBV6/00084, 

Revision A, dated May 26, 2017 (MOD 

6/2299); 

• Viking DHC–6 Twin Otter 

Technical Bulletin No. V6/00099, 

Revision NC, dated December 23, 2016 

(MOD 6/2389); 

• Viking DHC–6 Twin Otter 

Technical Bulletin No. TBV6/00094, 

Revision NC, dated November 1, 2016 

(MOD 6/2390); 

• Viking DHC–6 Twin Otter 

Technical Bulletin No. V6/00100, 

Revision NC, dated February 20, 2017 

(MOD 6/2393); and 

• Viking DHC–6 Twin Otter 

Technical Bulletin No. V6/00152, 

Revision NC, dated January 29, 2021 

(MOD 6/2464). 

Costs of Compliance 

The FAA estimates that this AD 

affects 4 airplanes of U.S. registry. 

The FAA estimates the following 

costs to comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per airplane Cost on U.S. operators 

Inspect fuel gallery ....................... 3 work-hours × $85 per 

hour = $255.

Not applicable .. $255 per inspection cycle ... $1,020 per inspection cycle. 

MOD 6/2267—Fuel boost pump 

EMI filter relocation.

16 work-hours × $85 per 

hour = $1,360.

$4,762 .............. $6,122 ................................. $12,244 (for 2 affected airplanes). 

MOD 6/2299—Improved fuel 

boost pump.

17 work-hours × $85 per 

hour = $1,445.

$42,290 ............ $43,735 ............................... $131,205 (for 3 affected airplanes). 

MOD 6/2389—Electrical Bonding 

Fuel System Manifold Drain 

Valve.

18 work-hours × $85 per 

hour = $1,530.

$572 ................. $2,102 ................................. $8,408 (for 4 affected airplanes). 

MOD 6/2390—Fuel probe, improved mating electrical connection.20 work-hours × $85 per 

hour = $1,700.

$2,129 .............. $3,829 ................................. $11,487 (for 3 affected airplanes). 

MOD 6/2393—Fuel system manifold—drain valve.8 work-hours × $85 per 

hour = $680.

$225 ................. $905 .................................... $3,620 (for 4 affected airplanes). 

MOD 6/2464—Fuel pressure 

switch replacement.

10 work-hours × $85 per 

hour = $850.

$3,953 .............. $4,803 ................................. $14,409 (for 3 affected airplanes). 

On-Condition Costs 

The extent of corrosion damage found 

during the inspections may vary 

significantly from airplane to airplane. 

The FAA has no way of determining 

how much corrosion damage may be 

found on each airplane, the cost for 

repairing corrosion damage on each 

airplane, or the number of airplanes that 

may require repair. 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s 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 Agency’s 

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. 


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Federal Register / Vol. 87, No. 68 / Friday, April 8, 2022 / Rules and Regulations 20703 

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 

distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify 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. 

The Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 14 CFR part 39 as 

follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

2022–07–14 Viking Air Limited (Type 

Certificate Previously Held by 

Bombardier Inc. and de Havilland, Inc.): 

Amendment 39–22002; Docket No. 

FAA–2022–0007; Project Identifier 

2018–CE–048–AD. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective May 13, 2022. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Viking Air Limited 

(type certificate previously held by 

Bombardier Inc. and de Havilland, Inc.) 

Model DHC–6–400 airplanes, serial numbers 

845 through 957, certificated in any category. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 2800, Aircraft Fuel System. 

(e) Reason 

This AD was prompted by mandatory 

continuing airworthiness information (MCAI) 

originated by an aviation authority of another 

country to identify and correct an unsafe 

condition on an aviation product. The MCAI 

describes the unsafe condition as corrosion of 

fuel system components located in the fuel 

gallery due to inadequate corrosion 

protection. The FAA is issuing this AD to 

prevent corrosion-related damage to fuel 

system components, which could lead to fuel 

leaks, electrical arcing, loss of fuel boost 

pump function, and erroneous fuel quantity 

readings. This unsafe condition, if not 

corrected, could result in fuel starvation with 

loss of engine power and increased risk of an 

in-flight fire with consequent loss of airplane 

control. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions for Airplanes Operating 

on Floats on the Effective Date of This AD 

(1) Within 50 hours time-in-service (TIS) 

after the effective date of this AD or within 

3 months after the effective date of this AD, 

whichever occurs first, and thereafter at 

intervals not to exceed 125 hours TIS, do the 

following actions: 

(i) Remove all fuel gallery covers and rinse 

the fuel gallery with water. 

(ii) Inspect the fuel gallery for corrosion 

and, if there is any corrosion, take all 

necessary corrective actions before further 

flight by following Item D.15(2) of Special 

Inspection 3 in Temporary Revision No. 241, 

dated July 27, 2021, to the Viking DHC–6 

Inspection Requirements Manual, PSM 1–6– 

7. 

(2) Within 12 months after the effective 

date of this AD, install the modifications 

applicable to your airplane serial number by 

following the Accomplishment Instructions, 

sections A. through E., in Viking DHC–6 

Twin Otter Service Bulletin No. V6/0044, 

Revision B, dated September 13, 2021 

(Viking SB V6/0044, Revision B). 

(h) Required Actions for Airplanes Modified 

To Operate on Floats After the Effective Date 

of This AD 

Within 12 months after the airplane is 

modified to operate on floats, regardless of 

whether the landing gear is later modified 

back to non-float landing gear, install the 

modifications applicable to your airplane 

serial number by following the 

Accomplishment Instructions, sections A. 

through E., in Viking SB V6/0044, Revision 

B. 

(i) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, New York ACO Branch, 

FAA, has the authority to approve AMOCs 

for this AD, if requested using the procedures 

found in 14 CFR 39.19. In accordance with 

14 CFR 39.19, send your request to your 

principal inspector or local Flight Standards 

District Office, as appropriate. If sending 

information directly to the manager of the 

certification office, send it to the attention of 

the person identified in paragraph (j)(1) of 

this AD. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(j) Related Information 

(1) For more information about this AD, 

contact Joseph Catanzaro, Aviation Safety 

Engineer, New York ACO Branch, FAA, 1600 

Stewart Avenue, Suite 410, Westbury, NY 

11590; phone: (516) 228–7366; email: 

joseph.catanzaro@faa.gov. 

(2) Refer to Transport Canada AD CF– 

2018–07, dated February 23, 2018, for more 

information. You may examine the Transport 

Canada AD in the AD docket at https://

www.regulations.gov by searching for and 

locating Docket No. FAA–2022–0007. 

(k) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless the AD specifies otherwise. 

(i) Viking DHC–6 Twin Otter Service 

Bulletin No. V6/0044, Revision B, dated 

September 13, 2021. 

(ii) Temporary Revision No. 241, dated July 

27, 2021, to the Viking DHC–6 Inspection 

Requirements Manual, PSM 1–6–7. 

(3) For service information identified in 

this AD, contact Viking Air Limited 

Technical Support, 1959 de Havilland Way, 

Sidney, British Columbia, Canada, V8L 5V5; 

phone: (North America) (800) 663–8444; fax: 

(250) 656–0673; email: technical.support@

vikingair.com; website: https://

www.vikingair.com/support/service-bulletins. 

(4) You may view this service information 

at the FAA, Airworthiness Products Section, 

Operational Safety Branch, 901 Locust, 

Kansas City, MO 64106. For information on 

the availability of this material at the FAA, 

call (817) 222–5110. 

(5) You may view this service information 

that is incorporated by reference at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

email: fr.inspection@nara.gov, or go to: 

https://www.archives.gov/federal-register/cfr/ 

ibr-locations.html. 

Issued on March 25, 2022. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–07477 Filed 4–7–22; 8:45 am] 

BILLING CODE 4910–13–P 


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