3658 Federal Register / Vol. 75, No. 14 / Friday, January 22, 2010 / Proposed Rules 

TABLE 1—APPLICABLE PART NUMBERS

Boeing specification 

part number 

Equivalent Boeing supplier part numbers 

Sierra engineering Spencer fluid Puritan bennett Hydraflow 

60B50059–70 .......................... 835–01–70 .............................. 9513–20S5–18.0 ..................... ZH784–20 ............................... 38001–70 

60B50059–81 .......................... Not applicable ......................... Not applicable ......................... Not applicable ......................... 38001–81 

60B50059–94 .......................... Not applicable ......................... Not applicable ......................... Not applicable ......................... 38001–94 

60B50059–101 ........................ Not applicable ......................... Not applicable ......................... Not applicable ......................... 38001–101 

60B50059–130 ........................ Not applicable ......................... Not applicable ......................... Not applicable ......................... 38001–130 

Parts Installation 

(h) As of the effective date of this AD, no 

person may install a flightcrew or 

supernumerary oxygen hose with a part 

number identified in Table 1 of this AD on 

any airplane. 

Actions Accomplished According to 

Previous Issue of Service Bulletin 

(i) Actions accomplished before the 

effective date of this AD in accordance with 

Boeing Alert Service Bulletin 767–35A0034, 

dated September 2, 1999, are considered 

acceptable for compliance with the 

corresponding actions specified in this AD. 

Alternative Methods of Compliance 

(AMOCs) 

(j)(1) The Manager, Seattle 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: 

Robert Hettman, Aerospace Engineer, Cabin 

Safety and Environmental Systems Branch, 

ANM–150S, FAA, Seattle ACO, 1601 Lind 

Avenue, SW., Renton, Washington 98057– 

3356; telephone (425) 917–6457; fax (425) 

917–6590. Or, e-mail information to 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. 

(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 January 

8, 2010. 

Stephen P. Boyd, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2010–1174 Filed 1–21–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–0045; Directorate 

Identifier 2009–NM–085–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Model 747–100, 747–100B, 

747–100B SUD, 747–200B, 747–200C, 

747–200F, 747–300, 747–400, 747– 

400D, 747–400F, 747SR, and 747SP 

Series 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 747 airplanes. This proposed AD 

would require inspecting to verify the 

part number of the low-pressure flexhoses of the crew oxygen system 

installed under the oxygen mask 

stowage boxes in the flight deck, and 

replacing the flex-hose with a new nonconductive low-pressure flex-hose if 

necessary. This proposed AD results 

from reports of low-pressure flex-hoses 

of the crew oxygen system that burned 

through due to inadvertent electrical 

current from a short circuit in the audio 

select panel. We are proposing this AD 

to prevent inadvertent electrical current, 

which can cause the low-pressure flexhoses of the crew oxygen system to melt 

or burn, causing oxygen system leakage 

and smoke or fire. 

DATES: We must receive comments on 

this proposed AD by March 8, 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, P.O. Box 3707, 

MC 2H–65, Seattle, Washington 98124– 

2207; telephone 206–544–5000, 

extension 1; fax 206–766–5680; e-mail 

me.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 or 425–227–1152. 

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: 

Robert Hettman, Aerospace Engineer, 

Cabin Safety and Environmental 

Systems Branch, ANM–150S, FAA, 

Seattle Aircraft Certification Office, 

1601 Lind Avenue, SW., Renton, 

Washington 98057–3356; telephone 

(425) 917–6457; fax (425) 917–6590. 

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–2010–0045; Directorate Identifier 


erowe on DSK5CLS3C1PROD with PROPOSALS-1
Federal Register / Vol. 75, No. 14 / Friday, January 22, 2010 / Proposed Rules 3659 

2009–NM–085–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 have received reports of lowpressure flex-hoses of the crew oxygen 

system that burned through due to 

inadvertent electrical current from a 

short circuit in the audio select panel on 

a Model 757 airplane. An electrical 

current went through the support 

structure to the flight crew mask 

stowage box and through the lowpressure oxygen hose. This caused the 

spring inside the low-pressure oxygen 

hose to act as an electrical conductor 

and heat up, causing the hose to burn 

through. This condition, if not 

corrected, could result in the lowpressure flex-hose of the crew oxygen 

system melting or burning, causing 

oxygen system leakage and smoke or 

fire. 

Relevant Service Information 

We have reviewed Boeing Service 

Bulletin 747–35A2101, Revision 1, 

dated May 15, 2003. The service 

bulletin describes procedures for 

replacing the existing low-pressure flexhoses of the crew oxygen system 

installed under the oxygen mask 

stowage boxes in the flight deck with 

new non-conductive low-pressure flexhoses of the oxygen system. 

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 these same 

type designs. This proposed AD would 

require accomplishing the actions 

specified in the service information 

described previously, except as 

discussed under ‘‘Differences Between 

the Proposed AD and the Service 

Bulletin.’’ 

Differences Between the Proposed AD 

and the Service Bulletin 

Although Boeing Service Bulletin 

747–35A2101, Revision 1, dated May 

15, 2003, recommends accomplishing 

the replacement ‘‘at the earliest 

opportunity when manpower, material 

and facilities are available,’’ we have 

determined that this imprecise 

compliance time would not address the 

identified unsafe condition in a timely 

manner. In developing an appropriate 

compliance time for this proposed AD, 

we considered not only the 

manufacturer’s recommendation, but 

the degree of urgency associated with 

addressing the subject unsafe condition, 

the average utilization of the affected 

fleet, and the time necessary to perform 

the modifications. In light of all of these 

factors, we find a compliance time of 36 

months for completing the required 

actions to be warranted, in that it 

represents an appropriate interval of 

time for affected airplanes to continue to 

operate without compromising safety. 

This difference has been coordinated 

with Boeing. 

Other Rulemaking 

The oxygen mask installations on 

certain Model 737, 757, and 767 

airplanes are almost identical to those 

on the affected Model 747 airplanes. 

Therefore, all of these airplanes may be 

subject to the identified unsafe 

condition. We are considering similar 

rulemaking related to the identified 

unsafe condition for certain Model 737, 

757, and 767 airplanes. 

Costs of Compliance 

We estimate that this proposed AD 

would affect 211 airplanes of U.S. 

registry. We also estimate that it would 

take about 1 work-hour per product to 

comply with this proposed AD. The 

average labor rate is $80 per work-hour. 

Based on these figures, we estimate the 

cost of this proposed AD to the U.S. 

operators to be $16,880, or $80 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: 

The Boeing Company: Docket No. FAA– 

2010–0045; Directorate Identifier 2009– 

NM–085–AD. 

Comments Due Date 

(a) We must receive comments by March 8, 

2010. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to The Boeing 

Company Model 747–100, 747–100B, 747– 

100B SUD, 747–200B, 747–200C, 747–200F, 

747–300, 747–400, 747–400D, 747–400F, 

747SR, and 747SP series airplanes, 

certificated in any category; line numbers 1 

through 1229 inclusive. 


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3660 Federal Register / Vol. 75, No. 14 / Friday, January 22, 2010 / Proposed Rules 

Subject 

(d) Air Transport Association (ATA) of 

America Code 35: Oxygen. 

Unsafe Condition 

(e) This AD results from reports of lowpressure flex-hoses of the crew oxygen 

system that burned through due to 

inadvertent electrical current from a short 

circuit in the audio select panel. The Federal 

Aviation Administration is issuing this AD to 

prevent inadvertent electrical current, which 

can cause the low-pressure flex-hoses of the 

crew oxygen system to melt or burn, resulting 

in oxygen system leakage and smoke or fire. 

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. 

Inspection 

(g) Within 36 months after the effective 

date of this AD, do an inspection to 

determine whether any low-pressure flexhose of the crew oxygen system installed 

under the oxygen mask stowage box in the 

flight deck has a part number identified in 

Table 1 of this AD. A review of airplane 

maintenance records is acceptable in lieu of 

this inspection if the part number of the lowpressure flex-hoses of the crew oxygen 

system can be conclusively determined from 

that review. 

(1) For any hose having a part number 

identified in Table 1 of this AD, before 

further flight, replace the hose with a new or 

serviceable part, in accordance with the 

Accomplishment Instructions of Boeing 

Service Bulletin 747–35A2101, Revision 1, 

dated May 15, 2003. 

(2) For any hose not having a part number 

identified in Table 1 of this AD, no further 

action is required by this paragraph. 

TABLE 1—APPLICABLE PART NUMBERS

Boeing specification 

part number 

Equivalent 

hydraflow 

part number 

60B50059–19 ......................... 38001–19 

60B50059–20 ......................... 38001–20 

60B50059–60 ......................... 38001–60 

60B50059–62 ......................... 38001–62 

60B50059–69 ......................... 38001–69 

60B50059–70 ......................... 38001–70 

60B50059–81 ......................... 38001–81 

60B50059–94 ......................... 38001–94 

60B50059–95 ......................... 38001–95 

60B50059–101 ....................... 38001–101 

60B50059–129 ....................... 38001–129 

Parts Installation 

(h) As of the effective date of this AD, no 

person may install a crew oxygen hose with 

a part number identified in Table 1 of this 

AD on any airplane. 

Alternative Methods of Compliance 

(AMOCs) 

(i)(1) The Manager, Seattle 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: 

Robert Hettman, Aerospace Engineer, Cabin 

Safety and Environmental Systems Branch, 

ANM–150S, FAA, Seattle ACO, 1601 Lind 

Avenue, SW., Renton, Washington 98057– 

3356; telephone (425) 917–6457; fax (425) 

917–6590. Or, e-mail information to 9–ANM– 

Seattle-ACO–AMOC–Requests@faa.gov. 

(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 January 

8, 2010. 

Stephen P. Boyd, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2010–1175 Filed 1–21–10; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–0030; Directorate 

Identifier 2009–NM–135–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Model 757 Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for all 

Model 757 airplanes. This proposed AD 

would require repetitive inspections for 

corrosion and cracking in the front spar 

lower chord at the four fastener 

locations common to the side link 

support fitting at wing station (WS) 292, 

and corrective actions if necessary. This 

proposed AD results from reports that 

several operators have found cracking in 

the front spar lower chord at the four 

fastener locations common to the side 

link support fitting at WS 292. We are 

proposing this AD to detect and correct 

such corrosion and cracking, which, if 

not corrected, could grow and result in 

structural failure of the spar. 

DATES: We must receive comments on 

this proposed AD by March 8, 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, P.O. Box 3707, 

MC 2H–65, Seattle, Washington 98124– 

2207; telephone 206–544–5000, 

extension 1; fax 206–766–5680; e-mail 

me.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 or 425–227–1152. 

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: 

Chris Hartman, Aerospace Engineer, 

Airframe Branch, ANM–120S, FAA, 

Seattle Aircraft Certification Office 

(ACO), 1601 Lind Avenue, SW., Renton, 

Washington 98057–3356; telephone 

(425) 917–6432; fax (425) 917–6590. 

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–2010–0030; Directorate Identifier 

2009–NM–135–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 


erowe on DSK5CLS3C1PROD with PROPOSALS-1