This section of the FEDERAL REGISTER

contains notices to the public of the proposed

issuance of rules and regulations. The

purpose of these notices is to give interested

persons an opportunity to participate in the

rule making prior to the adoption of the final

rules.

Proposed Rules Federal Register

38941 

Vol. 75, No. 129 

Wednesday, July 7, 2010 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–0676; Directorate 

Identifier 2010–NM–095–AD] 

RIN 2120–AA64 

Airworthiness Directives; Learjet Inc. 

Model 45 Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for certain 

Learjet Inc. Model 45 airplanes. This 

proposed AD would require replacing 

aluminum fire extinguisher discharge 

tubes with new, improved tubes; 

checking the fire extinguisher container 

for certain serial numbers; replacing fire 

extinguisher containers that have 

affected serial numbers; inspecting the 

pressure indicator on certain fire 

extinguisher containers for 

discrepancies; and performing 

corrective action if necessary. This 

proposed AD results from a report of 

accidental discharge of a fire 

extinguisher container and damage to an 

aluminum discharge tube. Investigation 

revealed that following the discharge an 

inaccurate pressure indication, due to 

the indicator dial being incorrectly 

staked, showed that the container was 

fully charged. We are proposing this AD 

to prevent inaccurate pressure readings 

and subsequent damage to the discharge 

tubes during operation, which could 

result in failure of the fire extinguisher 

system and an uncontained fire in an 

emergency situation. 

DATES: We must receive comments on 

this proposed AD by August 23, 2010. 

ADDRESSES: You may send comments by 

any of the following methods: 

• Federal eRulemaking Portal: Go to 

http://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: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue, SE., 

Washington, DC 20590, between 9 a.m. 

and 5 p.m., Monday through Friday, 

except Federal holidays. 

For service information identified in 

this proposed AD, contact Learjet, Inc., 

One Learjet Way, Wichita, Kansas 

67209–2942; telephone 316–946–2000; 

fax 316–946–2220; e-mail 

ac.ict@aero.bombardier.com; Internet 

http://www.bombardier.com. You may 

review copies of the referenced service 

information at the FAA, Transport 

Airplane Directorate, 1601 Lind 

Avenue, SW., Renton, Washington. For 

information on the availability of this 

material at the FAA, call 425–227–1221. 

Examining the AD Docket 

You may examine the AD docket on 

the Internet at http:// 

www.regulations.gov; or in person at the 

Docket Management Facility between 9 

a.m. and 5 p.m., Monday through 

Friday, except Federal holidays. The AD 

docket contains this proposed AD, the 

regulatory evaluation, any comments 

received, and other information. The 

street address for the Docket Office 

(telephone 800–647–5527) is in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

FOR FURTHER INFORMATION CONTACT: 

James Galstad, Aerospace Engineer, 

Systems and Propulsion Branch, ACE– 

116W, FAA, Wichita Aircraft 

Certification Office, 1801 Airport Road, 

Room 100, Mid-Continent Airport, 

Wichita, Kansas 67209; telephone (316) 

946–4135; fax (316) 946–4107. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposed AD. Send your comments 

to an address listed under the 

ADDRESSES section. Include ‘‘Docket No. 

FAA–2010–0676; Directorate Identifier 

2010–NM–095–AD’’ at the beginning of 

your comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this proposed AD. We will 

consider all comments received by the 

closing date and may amend this 

proposed AD because of those 

comments. 

We will post all comments we 

receive, without change, to http:// 

www.regulations.gov, including any 

personal information you provide. We 

will also post a report summarizing each 

substantive verbal contact we receive 

about this proposed AD. 

Discussion 

We received a report of accidental 

discharge of a fire extinguisher 

container and damage to an aluminum 

discharge tube. Investigation revealed 

that following the discharge an 

inaccurate pressure indication, due to 

the indicator dial being incorrectly 

staked, showed that the container was 

fully charged. Inaccurate pressure 

readings, and subsequent damage to the 

discharge tubes during operation, could 

result in failure of the fire extinguisher 

system and an uncontained fire in an 

emergency situation. 

Relevant Service Information 

We have reviewed Bombardier 

Service Bulletins 40–26–05 and 45–26– 

9, both Revision 2, both dated May 4, 

2009. The service information describes 

procedures for the following: 

• For all airplanes: Installing new orings and stainless steel fire 

extinguisher discharge tubes and 

inspect the serial numbers on the fire 

extinguisher containers to determine 

whether any serial number is specified 

in Table 1 of the Accomplishment 

Instructions of the applicable service 

bulletin. 

• For airplanes on which no serial 

number is specified in Table 1: 

Inspecting the pressure indicator on the 

fire extinguisher container to ensure 

that the indicator dial is not loose and 

is staked in the right location, and do a 

weight check of the fire extinguisher 

container. If the indicator is loose or not 

staked in the right location or if the 

weight check for any container fails, 

replacing the affected container. 

• For airplanes on which any serial 

number is specified in Table 1: 

Replacing the affected fire extinguisher 

container, and do a weight check of the 

replaced containers. If the weight check 

for any replacement container fails, 

replacing the affected container. 


cprice-sewell on DSK8KYBLC1PROD with PROPOSALS-1
38942 Federal Register / Vol. 75, No. 129 / Wednesday, July 7, 2010 / Proposed Rules 

FAA’s Determination and Requirements 

of This Proposed AD 

We are proposing this AD because we 

evaluated all relevant information and 

determined the unsafe condition 

described previously is likely to exist or 

develop in other products of the same 

type design. This proposed AD would 

require accomplishing the actions 

specified in the service information 

described previously. 

Costs of Compliance 

We estimate that this proposed AD 

would affect 322 airplanes of U.S. 

registry. We also estimate that it would 

take 5 work-hours per product to 

comply with this proposed AD. The 

average labor rate is $85 per work-hour. 

Required parts cost would be minimal. 

Where the service information lists 

required parts costs that are covered 

under warranty, we have assumed that 

there will be no charge for these costs. 

As we do not control warranty coverage 

for affected parties, some parties may 

incur costs higher than estimated here. 

Based on these figures, we estimate the 

cost of this proposed AD to the U.S. 

operators to be $136,850, or $425 per 

product. 

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. 

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 rulemaking 

action. 

Regulatory Findings 

We determined that this proposed AD 

would not have federalism implications 

under Executive Order 13132. This 

proposed AD would 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 proposed regulation: 

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. 

You can find our regulatory 

evaluation and the estimated costs of 

compliance in the AD Docket. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 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 AD: 

Learjet Inc: Docket No. FAA–2010–0676; 

Directorate Identifier 2010–NM–095–AD. 

Comments Due Date 

(a) We must receive comments by August 

23, 2010. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to Learjet Inc. Model 

45 airplanes, certificated in any category; as 

identified in Bombardier Service Bulletins 

40–26–05 and 45–26–9, both Revision 2, both 

dated May 4, 2009. 

Subject 

(d) Air Transport Association (ATA) of 

America Code 26: Fire protection. 

Unsafe Condition 

(e) This AD results from a report of 

accidental discharge of a fire extinguisher 

container and damage to an aluminum 

discharge tube. Investigation revealed that 

following the discharge an inaccurate 

pressure indication, due to the indicator dial 

being incorrectly staked, showed that the 

container was fully charged. The Federal 

Aviation Administration is issuing this AD to 

prevent inaccurate pressure readings and 

subsequent damage to the discharge tubes 

during operation, which could result in 

failure of the fire extinguisher system and an 

uncontained fire in an emergency situation. 

Compliance 

(f) You are responsible for having the 

actions required by this AD performed within 

the compliance times specified, unless the 

actions have already been done. 

Replacement, Check, Inspection, Corrective 

Action 

(g) Within 12 months after the effective 

date of this AD: Replace the aluminum fire 

extinguisher discharge tubes with new, 

improved stainless steel tubes; check the fire 

extinguisher container for any serial number 

specified in Table 1 of Bombardier Service 

Bulletins 40–26–05 or 45–26–9, both 

Revision 2, both dated May 4, 2009; as 

applicable; replace any containers that have 

affected serial numbers, do a weight check of 

all containers, including the replacement 

container, if applicable; and inspect the 

pressure indicator on the containers for 

discrepancies, by doing all applicable actions 

in accordance with the Accomplishment 

Instructions of Bombardier Service Bulletins 

40–26–05 or 45–26–9, both Revision 2, both 

dated May 4, 2009; as applicable. If any 

discrepancy is found, replace the container 

before further flight in accordance with the 

Accomplishment Instructions of Bombardier 

Service Bulletins 40–26–05 or 45–26–9, both 

Revision 2, both dated May 4, 2009; as 

applicable. 

(h) Actions done before the effective date 

of this AD in accordance with the applicable 

service information listed in Table 1 of this 

AD are acceptable for compliance with the 

corresponding requirements in paragraph (g) 

of this AD. 

TABLE 1—CREDIT SERVICE INFORMATION

Affected serial numbers— 

Bombardier 

service bulletin— Revision— Dated— 

For Model 45 airplanes having serial numbers 2001 through 2114, inclusive ... 40–26–05 Basic Issue ................ November 24, 2008. 

For Model 45 airplanes having serial numbers 2001 through 2114, inclusive ... 40–26–05 1 ................................ December 22, 2008. 

For Model 45 airplanes having serial numbers 006 through 383, inclusive ....... 45-26-9 Basic Issue ................ November 24, 2008. 


cprice-sewell on DSK8KYBLC1PROD with PROPOSALS-1
Federal Register / Vol. 75, No. 129 / Wednesday, July 7, 2010 / Proposed Rules 38943 

TABLE 1—CREDIT SERVICE INFORMATION—Continued 

Affected serial numbers— 

Bombardier 

service bulletin— Revision— Dated— 

For Model 45 airplanes having serial numbers 006 through 383, inclusive ....... 45-26-9 1 ................................ December 22, 2008. 

Alternative Methods of Compliance 

(AMOCs) 

(i)(1) The Manager, Wichita Aircraft 

Certification Office (ACO), FAA, has the 

authority to approve AMOCs for this AD, if 

requested using the procedures found in 14 

CFR 39.19. Send information to ATTN: James 

Galstad, Aerospace Engineer, Systems and 

Propulsion Branch, ACE–116W, FAA, 

Wichita Aircraft Certification Office, 1801 

Airport Road, Room 100, Mid-Continent 

Airport, Wichita, Kansas 67209; telephone 

(316) 946–4135; fax (316) 946–4107. 

(2) To request a different method of 

compliance or a different compliance time 

for this AD, follow the procedures in 14 CFR 

39.19. Before using any approved AMOC on 

any airplane to which the AMOC applies, 

notify your principal maintenance inspector 

(PMI) or principal avionics inspector (PAI), 

as appropriate, or lacking a principal 

inspector, your local Flight Standards District 

Office. The AMOC approval letter must 

specifically reference this AD. 

Issued in Renton, Washington, on June 29, 

2010. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2010–16514 Filed 7–6–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–0672; Directorate 

Identifier 2010–NM–047–AD] 

RIN 2120–AA64 

Airworthiness Directives; McDonnell 

Douglas Corporation Model DC–10–10, 

DC–10–10F, DC–10–30, DC–10–30F 

(KDC–10), DC–10–40, and DC–10–40F 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for certain 

Model DC–10–10, DC–10–10F, DC–10– 

30, DC–10–30F (KDC–10), DC–10–40, 

and DC–10–40F airplanes. This 

proposed AD would require installing a 

support bracket and coupler on the left 

and right wing-to-fuselage transition, 

and metallic overbraid on the left and 

right leading edge wire assembly. This 

proposed AD results from fuel system 

reviews conducted by the manufacturer, 

as well as reports that the fuel quantity 

system was affected by lightninginduced transients. We are proposing 

this AD to prevent lightning-induced 

transients to the fuel quantity indication 

system, which could cause voltage 

levels to go beyond original design 

levels between fuel tank probes and 

structure, and become a potential 

ignition source at the fuel tank, which, 

in combination with flammable fuel 

vapors, could result in a fuel tank 

explosion and consequent loss of the 

airplane. 

DATES: We must receive comments on 

this proposed AD by August 23, 2010. 

ADDRESSES: You may send comments by 

any of the following methods: 

• Federal eRulemaking Portal: Go to 

http://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: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue, SE., 

Washington, DC 20590, between 9 a.m. 

and 5 p.m., Monday through Friday, 

except Federal holidays. 

For service information identified in 

this proposed AD, contact Boeing 

Commercial Airplanes, Attention: Data 

& Services Management, 3855 

Lakewood Boulevard, MC D800–0019, 

Long Beach, California 90846–0001; 

telephone 206–544–5000, extension 2; 

fax 206–766–5683; e-mail 

dse.boecom@boeing.com; Internet 

https://www.myboeingfleet.com. You 

may review copies of the referenced 

service information at the FAA, 

Transport Airplane Directorate, 1601 

Lind Avenue, SW., Renton, Washington. 

For information on the availability of 

this material at the FAA, call 425–227– 

1221. 

Examining the AD Docket 

You may examine the AD docket on 

the Internet at http:// 

www.regulations.gov; or in person at the 

Docket Management Facility between 9 

a.m. and 5 p.m., Monday through 

Friday, except Federal holidays. The AD 

docket contains this proposed AD, the 

regulatory evaluation, any comments 

received, and other information. The 

street address for the Docket Office 

(telephone 800–647–5527) is in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

FOR FURTHER INFORMATION CONTACT: 

Samuel Lee, Aerospace Engineer, 

Propulsion Branch, ANM–140L, FAA, 

Los Angeles Aircraft Certification Office 

(ACO), 3960 Paramount Boulevard, 

Lakewood, California 90712–4137; 

telephone (562) 627–5262; fax (562) 

627–5210. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposed AD. Send your comments 

to an address listed under the 

ADDRESSES section. Include ‘‘Docket No. 

FAA–2010–0672; Directorate Identifier 

2010–NM–047–AD’’ at the beginning of 

your comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this proposed AD. We will 

consider all comments received by the 

closing date and may amend this 

proposed AD because of those 

comments. 

We will post all comments we 

receive, without change, to http:// 

www.regulations.gov, including any 

personal information you provide. We 

will also post a report summarizing each 

substantive verbal contact we receive 

about this proposed AD. 

Discussion 

The FAA has examined the 

underlying safety issues involved in fuel 

tank explosions on several large 

transport airplanes, including the 

adequacy of existing regulations, the 

service history of airplanes subject to 

those regulations, and existing 

maintenance practices for fuel tank 

systems. As a result of those findings, 

we issued a regulation titled ‘‘Transport 

Airplane Fuel Tank System Design 

Review, Flammability Reduction and 

Maintenance and Inspection 

Requirements’’ (66 FR 23086, May 7, 

2001). In addition to new airworthiness 


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