Federal Register / Vol. 87, No. 88 / Friday, May 6, 2022 / Rules and Regulations 26969 

(j) Related Information 

For more information about this AD, 

contact Stephen Elwin, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

Avenue, Burlington, MA 01803; phone: (781) 

238–7236; email: Stephen.L.Elwin@faa.gov. 

(k) Material Incorporated by Reference 

None. 

Issued on April 30, 2022. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2022–09631 Filed 5–5–22; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2022–0506; Project 

Identifier MCAI–2022–00507–G; Amendment 

39–22037; AD 2022–09–17] 

RIN 2120–AA64 

Airworthiness Directives; ScheibeAircraft-GmbH Gliders 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; request for 

comments. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Scheibe-Aircraft-GmbH Model SF 25 C 

gliders. This AD was prompted by 

mandatory continuing airworthiness 

information (MCAI) issued by the 

aviation authority of another country to 

identify and correct an unsafe condition 

on an aviation product. The MCAI 

identifies the unsafe condition as severe 

corrosion on the inner surface of the 

control stick tube. This AD requires 

inspecting the left-hand (LH) and righthand (RH) control sticks for corrosion 

and, if corrosion is found, replacing the 

affected control stick. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective May 23, 

2022. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of May 23, 2022. 

The FAA must receive comments on 

this AD by June 21, 2022. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

https://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: (202) 493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this final rule, contact Scheibe Aircraft 

GmbH, Am Flugplatz 5, Heubach, D– 

73540, Germany; phone: +49 07173 

184286; email: info@scheibe-aircraft.de; 

website: https://scheibe-aircraft.de/. 

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. It is also available at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2022– 

0506. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2022–0506; 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 

street address for the Docket Operations 

is listed above. 

FOR FURTHER INFORMATION CONTACT: Jim 

Rutherford, Aviation Safety Engineer, 

General Aviation & Rotorcraft Section, 

International Validation Branch, FAA, 

901 Locust, Room 301, Kansas City, MO 

64106; phone: (816) 329–4165; email: 

jim.rutherford@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The European Union Aviation Safety 

Agency (EASA), which is the Technical 

Agent for the Member States of the 

European Union, has issued EASA 

Emergency AD 2022–0066–E, dated 

April 11, 2022 (referred to after this as 

‘‘the MCAI’’), to address an unsafe 

condition on Scheibe-Aircraft-GmbH 

(formerly Sportavia-Pu ̈tzer GmbH & Co. 

KG and Scheibe Flugzeugbau GmbH) 

Model SF 25-series sailplanes (gliders). 

The MCAI states: 

An occurrence was reported of finding 

fracture in a RH control stick of a powered 

sailplane, located above the weld seam at the 

transfer joint. Subsequent investigation 

determined that the fracture was a result of 

severe corrosion phenomena affecting the 

inner surface of the control stick tube due to 

water ingress. 

This condition, if not detected and 

corrected, could lead to a rupture of an 

affected part, possibly resulting in reduced 

control, or loss of control, of the powered 

sailplane. 

To address this unsafe condition, Scheibe 

issued the original issue of [service bulletin] 

TM/SB 653–96 to provide inspection and 

replacement instructions. 

Consequently, EASA issued Emergency AD 

2022–0043–E (later revised) to require 

repetitive inspections of each affected part to 

detect corrosion and replacement of each 

affected part with a serviceable part. 

Since EASA AD 2022–0043R1 was issued, 

it was identified that powered sailplanes on 

which Scheibe mod[ification] 653C–41–S10.1 

is embodied are also affected by this unsafe 

condition. 

For the reason described above, this 

[EASA] AD retains the requirements of EASA 

AD 2022–0043R1, which is superseded, and 

expands the Applicability. 

You may examine the MCAI in the 

AD docket at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2022– 

0506. 

FAA’s Determination 

The FAA is issuing this AD because 

the agency has determined the unsafe 

condition described previously is likely 

to exist or develop in other products of 

the same type design. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Scheibe Aircraft 

GmbH Service Bulletin 653–96/1, dated 

April 4, 2022. This service information 

specifies procedures for repetitive 

inspections for corrosion on the LH and 

RH control sticks and replacement 

instructions for when corrosion is 

found. 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 

ADDRESSES. 

Other Related Service Information 

The FAA also reviewed Scheibe 

Aircraft GmbH Service Bulletin 653–96, 

dated March 2, 2022. This service 

information specifies procedures for 

repetitive inspections for corrosion on 

the LH and RH control sticks and 

replacement instructions for when 

corrosion is found. 

FAA’s 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 

FAA’s bilateral agreement with this 

State of Design Authority, it has notified 

the FAA of the unsafe condition 

described in the MCAI and service 


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26970 Federal Register / Vol. 87, No. 88 / Friday, May 6, 2022 / Rules and Regulations 

information referenced above. The FAA 

is issuing this AD because it has 

determined the unsafe condition 

described previously is likely to exist or 

develop on other products of the same 

type design. 

AD Requirements 

This AD requires accomplishing the 

actions specified in the service 

information already described, except as 

discussed under ‘‘Differences Between 

this AD and the MCAI.’’ 

Differences Between This AD and the 

MCAI 

The MCAI applies to serial numbers 

(S/N) 44147 through S/N 44159 

inclusive, and this AD does not because 

those gliders are not eligible for import 

into the United States. 

The MCAI applies to Model SF 25 E 

and SF 25 K gliders, and this AD does 

not because they do not have an FAA 

type certificate. 

The MCAI allows for a 30-day 

compliance time tolerance for the 

repetitive inspections to coincide with 

other maintenance tasks, and this AD 

does not. 

The MCAI allows the pilot-owner to 

do the inspections, and this AD does 

not. 

The MCAI specifies a 20-month 

modification requirement. The FAA is 

considering requiring this modification; 

however, the planned compliance time 

for this modification would allow 

enough time to provide notice and 

opportunity for prior public comment 

on the merits of this modification. The 

FAA may require that modification in a 

future AD action. 

Justification for Immediate Adoption 

and Determination of the Effective Date 

Section 553(b)(3)(B) of the 

Administrative Procedure Act (APA) (5 

U.S.C. 551 et seq.) authorizes agencies 

to dispense with notice and comment 

procedures for rules when the agency, 

for ‘‘good cause,’’ finds that those 

procedures are ‘‘impracticable, 

unnecessary, or contrary to the public 

interest.’’ Under this section, an agency, 

upon finding good cause, may issue a 

final rule without providing notice and 

seeking comment prior to issuance. 

Further, section 553(d) of the APA 

authorizes agencies to make rules 

effective in less than thirty days, upon 

a finding of good cause. 

An unsafe condition exists that 

requires the immediate adoption of this 

AD without providing an opportunity 

for public comments prior to adoption. 

The FAA has found that the risk to the 

flying public justifies waiving notice 

and comment prior to adoption of this 

rule because the amount of time 

moisture has accumulated in the control 

sticks and caused corrosion to develop 

is unknown. Therefore, the initial 

inspection must be accomplished before 

further flight. Accordingly, notice and 

opportunity for prior public comment 

are impracticable and contrary to the 

public interest pursuant to 5 U.S.C. 

553(b)(3)(B). 

In addition, the FAA finds that good 

cause exists pursuant to 5 U.S.C. 553(d) 

for making this amendment effective in 

less than 30 days, for the same reasons 

the FAA found good cause to forego 

notice and comment. 

Comments Invited 

The FAA invites you to send any 

written data, views, or arguments about 

this final rule. Send your comments to 

an address listed under ADDRESSES. 

Include ‘‘Docket No. FAA–2022–0506 

and Project Identifier MCAI–2022– 

00507–G’’ at the beginning of your 

comments. The most helpful comments 

reference a specific portion of the final 

rule, 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 this final rule 

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 final rule. 

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 AD 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 AD, 

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 placed in the public docket 

of this AD. Submissions containing CBI 

should be sent to Jim Rutherford, 

Aviation Safety Engineer, General 

Aviation & Rotorcraft Section, 

International Validation Branch, FAA, 

901 Locust, Room 301, Kansas City, MO 

64106. Any commentary that the FAA 

receives which is not specifically 

designated as CBI will be placed in the 

public docket for this rulemaking. 

Regulatory Flexibility Act 

The requirements of the Regulatory 

Flexibility Act (RFA) do not apply when 

an agency finds good cause pursuant to 

5 U.S.C. 553 to adopt a rule without 

prior notice and comment. Because FAA 

has determined that it has good cause to 

adopt this rule without prior notice and 

comment, RFA analysis is not required. 

Costs of Compliance 

The FAA estimates that this AD 

affects 1 glider of U.S. registry. 

The FAA estimates the following 

costs to comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

glider 

Cost on U.S. 

operators 

Inspect LH and RH control sticks ................. 4 work-hours × $85 per hour = $340 ........... Not Applicable .. $340 $340 

The FAA estimates the following 

costs to replace a single control stick, if 

required based on the results of the 

inspection: 


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Federal Register / Vol. 87, No. 88 / Friday, May 6, 2022 / Rules and Regulations 26971 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per 

glider 

Replace single control stick .......................................... 4 work-hours × $85 per hour = $340 ........................... $500 $840 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, some or all 

of the costs of this AD may be covered 

under warranty, thereby reducing the 

cost impact on affected operators. 

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. 

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 that this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

and 

(2) Will not affect intrastate aviation 

in Alaska. 

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: 

2022–09–17 Scheibe-Aircraft-GmbH: 

Amendment 39–22037; Docket No. 

FAA–2022–0506; Project Identifier 

MCAI–2022–00507–G. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective May 23, 2022. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Scheibe-Aircraft-GmbH 

Model SF 25 C gliders, certificated in any 

category, that have Scheibe Modification 

653E.41–S10 or 653C–41–S10.1 installed. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 2700, Flight Control System. 

(e) Unsafe Condition 

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 

identifies the unsafe condition as severe 

corrosion on the inner surface of the control 

stick tube. The FAA is issuing this AD to 

detect corrosion on the left-hand (LH) and 

right-hand (RH) control sticks, which, if not 

corrected, could lead to failure of the control 

stick tube and loss of control of the glider. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Inspection and Replacement 

(1) Before further flight after the effective 

date of this AD and thereafter at intervals not 

to exceed 12 months or 100 hours time-inservice, whichever occurs first, inspect all 

control sticks (other than part number (P/N) 

20093, P/N 20093/G, P/N 20094, and P/N 

20094/G) for corrosion by following Action 1, 

step 1.4, in Scheibe Aircraft GmbH Service 

Bulletin 653–96/1, dated April 4, 2022 (SB 

653–96/1), except you may use a borescope 

instead of an endoscope. If there is any 

corrosion, before further flight, replace the 

affected control stick with a LH control stick 

P/N 20093 or P/N 20093/G; or a RH control 

stick P/N 20094 or P/N 20094/G by following 

Action 3 (all steps) in SB 653–96/1. 

(2) Replacing a control stick with LH 

control stick P/N 20093 or P/N 20093/G; or 

RH control stick P/N 20094 or P/N 20094/G, 

terminates the repetitive inspection for that 

control stick side only. Replacing both 

control sticks with LH control stick P/N 

20093 or P/N 20093/G and RH control stick 

P/N 20094 or P/N 20094/G terminates the 

repetitive inspection for both sides. 

(3) As of the effective date of this AD, do 

not install on any glider a control stick that 

has a P/N other than LH control stick P/N 

20093 or P/N 20093/G; or RH control stick P/ 

N 20094 or P/N 20094/G. 

(h) Credit for Previous Actions 

You may take credit for the action required 

by paragraph (g)(1) of this AD if you 

performed those actions before the effective 

date of this AD using Scheibe Aircraft GmbH 

Service Bulletin 653–96, dated March 2, 

2022. 

(i) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, International Validation 

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 International Validation 

Branch, send it to the attention of the person 

identified in paragraph (j)(1) of this AD and 

email to: 9-AVS-AIR-730-AMOC@faa.gov. 

(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 Jim Rutherford, Aviation Safety 

Engineer, General Aviation & Rotorcraft 

Section, International Validation Branch, 

FAA, 901 Locust, Room 301, Kansas City, 

MO 64106; phone: (816) 329–4165; email: 

jim.rutherford@faa.gov. 

(2) Refer to European Union Aviation 

Safety Agency (EASA) Emergency AD 2022– 

0066–E, dated April 11, 2022, for more 

information. You may examine the EASA AD 

in the AD docket at https://

www.regulations.gov by searching for and 

locating it in Docket No. FAA–2022–0506. 

(3) Service information identified in this 

AD that is not incorporated by reference is 

available at the addresses specified in 

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


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26972 Federal Register / Vol. 87, No. 88 / Friday, May 6, 2022 / Rules and Regulations 

(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 this AD specifies otherwise. 

(i) Scheibe Aircraft GmbH Service Bulletin 

653–96/1, dated April 4, 2022. 

Note 1 to paragraph (k)(2)(i): Page 4 of this 

service information is identified as 653–95. 

Note 2 to paragraph (k)(2)(i): This service 

information contains German to English 

translation. EASA used the English 

translation in referencing the document from 

Scheibe Aircraft GmbH. For enforceability 

purposes, the FAA will cite the service 

information in English as it appears on the 

document. 

(ii) [Reserved] 

(3) For service information identified in 

this AD, contact Scheibe Aircraft GmbH, Am 

Flugplatz 5, Heubach, D–73540, Germany; 

phone: +49 07173 184286; email: info@

scheibe-aircraft.de; website: https://scheibeaircraft.de/. 

(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 April 22, 2022. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2022–09890 Filed 5–4–22; 4:15 pm] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–1173; Project 

Identifier AD–2021–00917–T; Amendment 

39–22017; AD 2022–08–14] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all The 

Boeing Company Model 747–8F series 

airplanes. This AD was prompted by 

reports of fuselage crown stringer 

cracking between station (STA) 740 and 

STA 1000, stringer (S)–7 to S–12. This 

AD requires repetitive detailed 

inspections for cracking of fuselage 

crown stringers and applicable oncondition actions. The FAA is issuing 

this AD to address the unsafe condition 

on these products. 

DATES: This AD is effective June 10, 

2022. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of June 10, 2022. 

ADDRESSES: For service information 

identified in this final rule, 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. 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. 

It is also available at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

1173. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–1173; 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, 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: 

Stefanie Roesli, Aerospace Engineer, 

Airframe Section, FAA, Seattle ACO 

Branch, 2200 South 216th St., Des 

Moines, WA 98198; phone and fax: 206– 

231–3964; email: stefanie.n.roesli@

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 all The Boeing Company Model 

747–8F series airplanes. The NPRM 

published in the Federal Register on 

January 31, 2022 (87 FR 4826). The 

NPRM was prompted by reports of 

fuselage crown stringer cracking 

between STA 740 and STA 1000, S–7 to 

S–12. In the NPRM, the FAA proposed 

to require repetitive detailed inspections 

for cracking of fuselage crown stringers 

and applicable on-condition actions. 

The FAA is issuing this AD to address 

cracking in fuselage crown stringers. 

This condition, if not addressed, could 

result in the inability of a structural 

element to sustain limit load, and could 

adversely affect the structural integrity 

of the airplane. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received a comment from 

Boeing, who supported the NPRM 

without change. 

Conclusion 

The FAA reviewed the relevant data, 

considered any comments received, and 

determined that air safety requires 

adopting this AD as proposed. Except 

for minor editorial changes, this AD is 

adopted as proposed in the NPRM. 

None of the changes will increase the 

economic burden on any operator. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Boeing Alert 

Requirements Bulletin 747–53A2906 

RB, dated July 16, 2021. This service 

information specifies procedures for 

repetitive detailed inspections for 

cracking of fuselage crown stringers, 

repair of cracks, and a high frequency 

eddy current (HFEC) inspection for 

cracking of repaired areas. 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 ADDRESSES. 

Costs of Compliance 

The FAA estimates that this AD 

affects 33 airplanes of U.S. registry. The 

FAA estimates the following costs to 

comply with this AD: 


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