75228 Federal Register / Vol. 69, No. 241 / Thursday, December 16, 2004 / Rules and Regulations 

Issued in Kansas City, Missouri, on 

December 6, 2004. 

William J. Timberlake, 

Acting Manager, Small Airplane Directorate, 

Aircraft Certification Service.

[FR Doc. 04–27284 Filed 12–15–04; 8:45 am] 

BILLING CODE 4910–13–P

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration 

14 CFR Part 39

[Docket No. FAA–2004–19693; Directorate 

Identifier 2004–CE–40–AD; Amendment 39–

13904; AD 2004–25–16] 

RIN 2120–AA64

Airworthiness Directives; Kelly 

Aerospace Power Systems Part 

Number (P/N) 14D11, A14D11, B14D11, 

C14D11, 23D04, A23D04, B23D04, 

C23D04, or P23D04 Fuel Regulator 

Shutoff Valves (Formerly Owned by 

ElectroSystems, JanAero Devices, 

Janitrol, C&D, FL Aerospace, and 

Midland-Ross Corporation)

AGENCY: Federal Aviation 

Administration (FAA), DOT.

ACTION: Final rule; request for 

comments. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) to 

supersede AD 2001–17–13, which 

applies to aircraft equipped with a Kelly 

Aerospace Power Systems (Kelly 

Aerospace) part number (P/N) 14D11, 

A14D11, B14D11, C14D11, 23D04, 

A23D04, B23D04, C23D04, or P23D04 

fuel regulator shutoff valve used with 

Kelly Aerospace B1500, B2030, B2500, 

B3040, B3500, B4050, or B4500 B-Series 

combustion heaters. AD 2001–17–13 

requires you to visually inspect or 

pressure test the fuel regulator shutoff 

valves for leaks and replace the fuel 

regulator shutoff valve if leaks are 

found. This AD is the result of 

continued reports of fuel regulator 

shutoff valve problems and the 

manufacturer revising the service 

information to modify the pressure test 

procedures and to specify installing 

improved design replacement parts. 

This AD retains the actions required in 

AD 2001–17–13, makes the inspection 

repetitive, and requires installing 

improved design replacement parts. We 

are issuing this AD to prevent failure of 

the fuel regulator shutoff valve, which 

could result in fuel leakage in aircraft 

with these combustion heaters. This 

failure could result in an aircraft fire.

DATES: This AD becomes effective on 

January 5, 2005. 

As of January 5, 2005, the Director of 

the Federal Register approved the 

incorporation by reference of certain 

publications listed in the regulation. 

We must receive any comments on 

this AD by February 11, 2005.

ADDRESSES: Use one of the following to 

submit comments on this AD: 

• DOT Docket Web site: Go to http:

//dms.dot.gov and follow the 

instructions for sending your comments 

electronically. 

• Government-wide rulemaking Web 

site: Go to http://www.regulations.gov

and follow the instructions for sending 

your comments electronically. 

• Mail: Docket Management Facility, 

U.S. Department of Transportation, 400 

Seventh Street, SW., Nassif Building, 

Room PL–401, Washington, DC 20590–

001. 

• Fax: 1–202–493–2251. 

• Hand delivery: Room PL–401 on the 

plaza level of the Nassif Building, 400 

Seventh Street, SW., Washington, DC, 

between 9 a.m. and 5 p.m., Monday 

through Friday, except Federal holidays. 

To get the service information 

identified in this proposed AD, contact 

Kelly Aerospace Power Systems, P.O. 

Box 273, Fort Deposit, Alabama 36032; 

telephone: (334) 227–8306; facsimile: 

(334) 227–8596; Internet: http://

www.kellyaerospace.com.

To view the comments to this AD, go 

to http://dms.dot.gov. The docket 

number is FAA–2004–19618.

FOR FURTHER INFORMATION CONTACT:

Kevin L. Brane, Aerospace Engineer, 

Atlanta Aircraft Certification Office, 

FAA, One Crown Center, 1985 Phoenix 

Boulevard, Suite 450, Atlanta, GA 

30349; telephone: (770) 703–6063; 

facsimile: (770) 703–6097.

SUPPLEMENTARY INFORMATION: Has FAA 

taken any action to this point? Reports 

of JanAero fuel regulator shutoff valves 

leaking caused FAA to issue AD 2001–

08–01, Amendment 39–12178 (66 FR 

19718, April 17, 2001). AD 2001–08–1 

required you to do the following on 

certain JanAero Devices (JanAero) 

14D11 and 23D04 series fuel regulator 

shutoff valves used with certain JanAero 

combustion heaters that are installed on 

aircraft:

—Visually inspect and pressure test the 

fuel regulator shutoff valves for leaks; 

and 

—If leaks are found, replace the fuel 

regulator shutoff valve.

The affected fuel regulator shutoff 

valves are part of the JanAero B1500, 

B2030, B2500, B3040, B3500, B4050, or 

B4500 combustion heater configuration. 

Operators of aircraft with the affected 

fuel regulator shutoff valves installed 

and mechanics who did the actions of 

AD 2001–08–01 provided suggestions 

for improvement to the AD. Based on 

that feedback, FAA superseded AD 

2001–08–01 with AD 2001–17–13, 

Amendment 39–12404 (66 FR 44027, 

August 22, 2001). 

AD 2001–17–13 retained the actions 

of AD 2001–08–01, except it requires 

only the visual inspection or the 

pressure test of the fuel regulator shutoff 

valves (not both) and lists the affected 

fuel regulator shutoff valves by part 

number instead of series. AD 2001–17–

13 also includes a provision for 

disabling the heater as an alternative 

method of compliance. 

Accomplishment of AD 2001–17–13 

is required following JanAero Service 

Bulletin No. A–107, dated January 8, 

2001. 

What has happened since AD 2001–

17–13 to initiate this AD action? The 

FAA continues to receive reports of 

problems with these fuel regulator 

shutoff valves. This service history 

reflects that the inspections should be 

repetitive instead of one-time.

Kelly Aerospace has revised the 

service information to modify the 

pressure test procedures, to specify 

installing improved design replacement 

parts with a manufacture date code of 

02/02 or later, and to make the 

inspection repetitive. 

The New Piper Aircraft, Inc. has also 

issued new service information that 

specifies replacing part number (P/N) 

A23D04–7.5 with an improved design 

replacement part P/N P23D04–7.5. 

What is the potential impact if FAA 

took no action? This condition, if not 

corrected, could result in fuel leakage in 

aircraft with these combustion heaters, 

which could result in an aircraft fire 

with consequent damage or destruction. 

FAA’s Determination and Requirements 

of the AD 

What has FAA decided? We have 

evaluated all pertinent information and 

identified an unsafe condition that is 

likely to exist or develop on other 

products of this same type design. 

Since the unsafe condition described 

previously is likely to exist or develop 

on type design aircraft equipped with a 

Kelly Aerospace B1500, B2030, B2500, 

B3040, B3500, B4050, or B4500 

combustion heater, we are issuing this 

AD to prevent failure of the fuel 

regulator shutoff valve, which could 

result in fuel leakage in aircraft with 

these combustion heaters. This failure 

could result in an aircraft fire. 

What does this AD require? This AD 

supersedes AD 2001–17–13 with a new 

AD that requires you to:

Federal Register / Vol. 69, No. 241 / Thursday, December 16, 2004 / Rules and Regulations 75229

—Repetitively inspect the fuel regulator 

shutoff valve (visually or by pressure 

test) for fuel leakage; 

—If fuel leakage is found, replace the 

fuel regulator shutoff valve with an 

improved design replacement part 

with a manufacture date code of 02/

02 or later.

This AD also allows you to disable the 

heater as an alternative method of 

compliance. 

In preparing this rule, we contacted 

type clubs and aircraft operators to get 

technical information and information 

on operational and economic impacts. 

We have included a discussion of 

information that may have influenced 

this action in the rulemaking docket. 

How does the revision to 14 CFR part 

39 affect this AD? On July 10, 2002, we 

published a new version of 14 CFR part 

39 (67 FR 47997, July 22, 2002), which 

governs FAA’s AD system. This 

regulation now includes material that 

relates to altered products, special flight 

permits, and alternative methods of 

compliance. This material previously 

was included in each individual AD. 

Since this material is included in 14 

CFR part 39, we will not include it in 

future AD actions. 

Comments Invited 

Will I have the opportunity to 

comment before you issue the rule? This 

AD is a final rule that involves 

requirements affecting flight safety and 

was not preceded by notice and an 

opportunity for public comment; 

however, we invite you to submit any 

written relevant data, views, or 

arguments regarding this AD. Send your 

comments to an address listed under 

ADDRESSES. Include ‘‘Docket No. FAA–

2004–19693; Directorate Identifier 

2004–CE–40–AD’’ in the subject line of 

your comments. If you want us to 

acknowledge receipt of your mailed 

comments, send us a self-addressed, 

stamped postcard with the docket 

number written on it; we will datestamp your postcard and mail it back to 

you. We specifically invite comments 

on the overall regulatory, economic, 

environmental, and energy aspects of 

the rule that might suggest a need to 

modify it. If a person contacts us 

through a nonwritten communication, 

and that contact relates to a substantive 

part of this AD, we will summarize the 

contact and place the summary in the 

docket. We will consider all comments 

received by the closing date and may 

amend the AD in light of those 

comments. 

Authority for This Rulemaking 

What authority does FAA have for 

issuing this rulemaking action? 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. 

We are 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 AD. 

Regulatory Findings 

Will this AD impact various entities?

We have 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. 

Will this AD involve a significant rule 

or regulatory action? For the reasons 

discussed above, I certify that this AD: 

1. Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866; 

2. Is not a ‘‘significant rule’’ under the 

DOT Regulatory Policies and Procedures 

(44 FR 11034, February 26, 1979); 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.

We prepared a summary of the costs 

to comply with this AD and placed it in 

the AD Docket. You may get a copy of 

this summary by sending a request to us 

at the address listed under ADDRESSES.

Include ‘‘AD Docket FAA–2004–19693; 

Directorate Identifier 2004–CE–40–AD’’

in your request.

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 Federal Aviation Administration 

amends part 39 of the Federal Aviation 

Regulations (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 

removing Airworthiness Directive (AD) 

2001–17–13, Amendment 39–12404 (66 

FR 44027, August 22, 2001), and by 

adding a new AD to read as follows:

2004–25–16 Kelly Aerospace Power 

Systems (formerly owned by 

ElectroSystems, JanAero Devices, 

Janitrol, C&D, FL Aerospace, and 

Midland-Ross Corporation):

Amendment 39–13904; Docket No. 

FAA–2004–19693; Directorate Identifier 

2004–CE–40–AD; Supersedes AD 2001–

17–13; Amendment 39–12404. 

When Does This AD Become Effective? 

(a) This AD becomes effective on January 

5, 2005. 

Are Any Other ADs Affected by This Action? 

(b) Yes. This AD supersedes AD 2001–17–

13, Amendment 39–12404. 

What Airplanes Are Affected by This AD? 

(c) What aircraft are affected by this AD?

This AD applies to aircraft equipped with a 

Kelly Aerospace part number (P/N) 14D11, 

A14D11, B14D11, C14D11, 23D04, A23D04, 

B23D04, C23D04 or P23D04 fuel regulator 

shutoff valve used with Kelly Aerospace 

B1500, B2030, B2500, B3040, B3500, B4050, 

or B4500 B-Series combustion heaters. The 

following is a list of aircraft where the BSeries combustion heater could be installed. 

This is not a comprehensive list and aircraft 

not on this list that have the heater installed 

through field approval or other methods are 

still affected by this AD:

Manufacturer Aircraft

models/series 

(1) Bombardier Inc. ......................... CL–215, CL–215T, and CLT–415. 

(2) Cessna Aircraft Company ......... 208, T303, 310F, 310G, 310H, 310I, 310J, 310K, 310L, 310N, 310P, 310Q, 320C, 320D, 320E, 320F, 337 

Series, 340, 340A, 414, 414A, 421, 421A, 421B, and 421C. 

(3) The New Piper Aircraft, Inc ....... PA–23 Series, PA–30, PA–31 Series, PA–34 Series, PA–39, and PA–44 Series. 

(4) Raytheon Aircraft Corporation ... 95–B55 Series, 58, 58TC, 58P, 60, A60, and 76. 

75230 Federal Register / Vol. 69, No. 241 / Thursday, December 16, 2004 / Rules and Regulations 

Note 1: The B1500, B2030, B2500, B3040, 

B3500, B4050, or B4500 B-Series combustion 

heaters were previously manufactured by 

Janitrol, C&D Airmotive, FL Aerospace, and 

Midland-Ross Corporation.

What Is the Unsafe Condition Presented in 

This AD? 

(d) This AD is the result of numerous 

reports of fuel regulator shutoff valves 

leaking fuel. We are issuing this AD to 

prevent failure of the fuel regulator shutoff 

valve, which could result in fuel leakage in 

aircraft with these combustion heaters. This 

failure could result in an aircraft fire.

What Must I Do To Address This Problem? 

(e) To address this problem, you must do 

the following:

Actions Compliance Procedures 

(1) Visually inspect or pressure test the fuel 

regulator shutoff valve for any signs of fuel 

leaks.

Within the next 25 hours aircraft time-in-service (TIS) after January 5, 2005 (the effective date of this AD), unless already done 

within the last 75 hours aircraft TIS (e.g., 

compliance with AD 2001–08–01 or 2001–

17–13).

Repetitively inspect thereafter at intervals not 

to exceed 100 hours aircraft TIS or 12 

months, whichever occurs first. This is established to coincide with 100-hour and annual inspections.

Locate the pressure regulator shutoff valve in 

the installation using the applicable maintenance manual for valve location, removal, 

and installation instructions. Follow the procedures in Kelly Aerospace Power Systems 

Service Bulletin No. A–107A, Issue Date: 

September 6, 2002, for the visual inspection or the pressure test. 

(2) If no fuel leaks or no signs of fuel stains are 

found during each inspection required by 

paragraph (e)(1) of this AD, mark the valve 

cover with date of inspection (month/year) 

using permanent ink and letters .12–.25′′ high 

next to or below the date of manufacture and 

make a log book entry with the date of inspection (month/year).

Prior to further flight after each inspection required in paragraph (e)(1) of this AD.Follow the procedures in Kelly Aerospace 

Power Systems Service Bulletin No. A–

107A, Issue Date: September 6, 2002. 

(3) If any signs of fuel leaks or any signs of fuel 

stains are found during any inspection required in paragraph (e)(1) of this AD, replace 

the valve with a new valve of appropriate part 

number (P/N) that has a manufacturer’s date 

code of 02/02 or later. For Piper PA–31–350 

model aircraft, replace P/N A23D04–7.5 

valve with P/N P23D04–7.5Ensure there are 

no fuel leaks in the replacement valve by following the inspection and identification requirements in paragraphs (e)(1) and (e)(2) of 

this AD.

Before further flight after the inspection where 

any fuel leak was found.

Follow Kelly Aerospace Power Systems Service Bulletin No. A–107A, Issue Date: September 6, 2002; Piper Vendor Service Publication VSP–150, dated January 31, 2003; 

and the applicable maintenance manual. 

(4) As an alternative method of compliance to 

this AD, you may disable the heater provided 

you immediately comply with the inspection, 

identification, and replacement requirements 

of this AD when you bring the heater back 

into service. Do the following actions when 

disabling: 

(i) Cap the fuel supply line upstream of the 

fuel regulator and shutoff valve; 

(ii) Disconnect the electrical power and ensure that the connections are properly 

secured to reduce the possibility of electrical spark or structural damage; 

(iii) Inspect and test to ensure that the 

cabin heater system is disabled; 

(iv) Ensure that no other aircraft system is 

affected by this action; 

(v) Ensure there are no fuel leaks; and 

(vi) Fabricate a placard with the words: 

‘‘System Inoperative’’. Install this placard 

at the heater control valve within the pilot’s clear view. 

If you choose this option, you must do it before the next required inspection specified 

in paragraph (e)(1) of this AD. To bring the 

heater back into service, you must do the 

actions of paragraphs (e)(1), (e)(2), and 

(e)(3) of this AD (inspection, identification, 

and replacement, as necessary).

Not Applicable. 

(5) Only install a fuel regulator shutoff valve 

with a manufacture date code of 02/02 or 

later.

As of January 5, 2005 (the effective date of 

this AD).

Not Applicable. 

May I Request an Alternative Method of 

Compliance? 

(f) You may request a different method of 

compliance or a different compliance time 

for this AD by following the procedures in 14 

CFR 39.19. Unless FAA authorizes otherwise, 

send your request to your principal 

inspector. The principal inspector may add 

comments and will send your request to the 

Manager, Atlanta ACO, FAA. For information 

on any already approved alternative methods 

of compliance, contact Kevin L. Brane, 

Aerospace Engineer, Atlanta Aircraft 

Certification Office, FAA, One Crown Center, 

1985 Phoenix Boulevard, Suite 450, Atlanta, 

GA 30349; telephone: (770) 703–6063; 

facsimile: (770) 703–6097. 

Federal Register / Vol. 69, No. 241 / Thursday, December 16, 2004 / Rules and Regulations 75231

Does This AD Incorporate Any Material by 

Reference? 

(g) You must do the actions required by 

this AD following the instructions in Kelly 

Aerospace Power Systems Service Bulletin 

No. A–107A, Issue Date: September 6, 2002; 

and Piper Vendor Service Publication VSP–

150, dated January 31, 2003. The Director of 

the Federal Register approved the 

incorporation by reference of this service 

bulletin in accordance with 5 U.S.C. 552(a) 

and 1 CFR part 51. To get a copy of this 

service information, contact Kelly Aerospace 

Power Systems, P.O. Box 273, Fort Deposit, 

Alabama 36032; telephone: (334) 227–8306; 

facsimile: (334) 227–8596; Internet: http://

www.kellyaerospace.com. To review copies 

of this service information, go to the National 

Archives and Records Administration 

(NARA). For information on the availability 

of this material at NARA, go to: http://

www.archives.gov/federal_register/code_

of_federal_regulations/ibr_locations.html or 

call (202) 741–6030. To view the AD docket, 

go to the Docket Management Facility; U.S. 

Department of Transportation, 400 Seventh 

Street, SW., Nassif Building, Room PL–401, 

Washington, DC 20590–001 or on the Internet 

at http://dms.dot.gov. The docket number is 

FAA–2004–19693.

Issued in Kansas City, Missouri, on 

December 6, 2004. 

William J. Timberlake, 

Acting Manager, Small Airplane Directorate, 

Aircraft Certification Service.

[FR Doc. 04–27283 Filed 12–15–04; 8:45 am] 

BILLING CODE 4910–13–P

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration 

14 CFR Part 39

[Docket No. 2002–NM–333–AD; Amendment 

39–13902; AD 2004–25–14] 

RIN 2120–AA64

Airworthiness Directives; McDonnell 

Douglas Model DC–9–14, DC–9–15, 

and DC–9–15F Airplanes; DC–9–20, 

DC–9–30, DC–9–40, DC–9–50 Series 

Airplanes; DC–9–81 (MD–81), DC–9–82 

(MD–82), DC–9–83 (MD–83), and DC–9–

87 (MD–87) Airplanes; and Model MD–

88 Airplanes

AGENCY: Federal Aviation 

Administration, DOT.

ACTION: Final rule.

SUMMARY: This amendment adopts a 

new airworthiness directive (AD), 

applicable to certain McDonnell 

Douglas airplane models, that requires 

an inspection of the retract cylinder 

support fitting and the cylinder bore of 

the support fitting of both main landing 

gear (MLG) for corrosion, and corrective 

action if necessary. This action also 

requires replacing cadmium-plated 

retract cylinder support bushings and 

bearings of both MLG. This action is 

necessary to detect and correct 

corrosion to the retract cylinder support 

fitting of the MLG and the cylinder bore 

in the support fitting, which could 

result in compromised integrity of the 

retract cylinder support fitting of the 

MLG and possible damage to the 

hydraulic system. This action is 

intended to address the identified 

unsafe condition.

DATES: Effective January 20, 2005. 

The incorporation by reference of a 

certain publication listed in the 

regulations is approved by the Director 

of the Federal Register as of January 20, 

2005.

ADDRESSES: The service information 

referenced in this AD may be obtained 

from Boeing Commercial Airplanes, 

Long Beach Division, 3855 Lakewood 

Boulevard, Long Beach, California 

90846, Attention: Data and Service 

Management, Dept. C1–L5A (D800–

0024). This information may be 

examined at the Federal Aviation 

Administration (FAA), Transport 

Airplane Directorate, Rules Docket, 

1601 Lind Avenue, SW., Renton, 

Washington; or at the FAA, Los Angeles 

Aircraft Certification Office, 3960 

Paramount Boulevard, Lakewood, 

California; or at the National Archives 

and Records Administration (NARA). 

For information on the availability of 

this material at NARA, call (202) 741–

6030, or go to: http://www.archives.gov/

federal_register/

code_of_federal_regulations/

ibr_locations.html.

FOR FURTHER INFORMATION CONTACT:

Mike Lee, Aerospace Engineer, Airframe 

Branch, ANM–120L, FAA, Los Angeles 

Aircraft Certification Office, 3960 

Paramount Boulevard, Lakewood, 

California 90712–4137; telephone (562) 

627–5325; fax (562) 627–5210.

SUPPLEMENTARY INFORMATION: A 

proposal to amend part 39 of the Federal 

Aviation Regulations (14 CFR part 39) to 

include an airworthiness directive (AD) 

that is applicable to certain McDonnell 

Douglas airplane models was published 

in the Federal Register on May 11, 2004 

(69 FR 26052). That action proposed to 

require an inspection of the retract 

cylinder support fitting and the cylinder 

bore of the support fitting of both main 

landing gear (MLG) for corrosion, and 

corrective action if necessary. That 

action also proposed to require 

replacing cadmium-plated retract 

cylinder support bushings and bearings 

of both MLG. 

Comments 

Interested persons have been afforded 

an opportunity to participate in the 

making of this amendment. Due 

consideration has been given to the 

single comment received.

Clarification of the Cost Estimate 

One commenter estimates it will cost 

more than $30,000 per airplane for its 

fleet of 362 airplanes to accomplish the 

inspection and replacement; for a total 

cost of over $11,000,000. 

We infer that the commenter wants 

further clarification of the cost estimate 

specified in the proposed AD. The 

estimate for both the inspection and 

replacement in the Cost Impact section 

of the final rule is between $20,617 and 

$29,861 per airplane, which is lower 

than the commenter’s cost estimate of 

more than $30,000 per airplane. 

However, the cost estimate in the 

proposed AD describes only the direct 

costs of those specific actions required 

by the proposed AD. We recognize that, 

in doing the actions required by an AD, 

operators may incur incidental costs in 

addition to the direct costs. As 

explained in the proposed AD, the cost 

analysis in AD rulemaking actions 

typically does not include incidental 

costs such as the time required to gain 

access and close up, time necessary for 

planning, or time necessitated by other 

administrative actions. Those incidental 

costs, which may vary significantly 

among operators, are almost impossible 

to calculate. Therefore, we have not 

changed the cost estimate in this final 

rule. 

Conclusion 

After careful review of the available 

data, including the comment noted 

above, we have determined that air 

safety and the public interest require the 

adoption of the rule as proposed. 

Clarification of Service Information 

Reference 

Where paragraph (b) of the proposed 

AD specifies, ‘‘in accordance with the 

service bulletin,’’ this final rule 

specifies, ‘‘in accordance with the 

Accomplishment Instructions of Boeing 

Service Bulletin DC9–57–222, dated 

September 18, 2002.’’

Cost Impact 

There are approximately 1,904 

airplanes of the affected design in the 

worldwide fleet. We estimate that 1,188 

airplanes of U.S. registry will be affected 

by this AD. 

We estimate that it will take 

approximately 1 work hour per airplane 

to accomplish the required inspection 

on both MLG, and that the average labor