7488 Federal Register / Vol. 73, No. 27 / Friday, February 8, 2008 / Proposed Rules 

Washington 98057–3356; telephone (425) 

917–6437; fax (425) 917–6590; has the 

authority to approve AMOCs for this AD, if 

requested using the procedures found in 14 

CFR 39.19. 

(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 appropriate principal inspector 

(PI) in the FAA Flight Standards District 

Office (FSDO), or lacking a PI, your local 

FSDO. 

(3) An AMOC that provides an acceptable 

level of safety may be used for any repair 

required by this AD, if it is approved by an 

Authorized Representative for the Boeing 

Commercial Airplanes Delegation Option 

Authorization Organization who has been 

authorized by the Manager, Seattle ACO, to 

make those findings. For a repair method to 

be approved, the repair must meet the 

certification basis of the airplane, and the 

approval must specifically refer to this AD. 

Issued in Renton, Washington, on January 

31, 2008. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. E8–2352 Filed 2–7–08; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2008–0149; Directorate 

Identifier 2007–NM–319–AD] 

RIN 2120–AA64 

Airworthiness Directives; Boeing 

Model 737–100, –200, –200C, –300, 

–400, and –500 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 

Boeing Model 737–100, –200, –200C, 

–300, –400, and –500 series airplanes. 

This proposed AD would require 

replacing the existing straight-to-90- 

degree hose assembly for the Lavatory 

‘‘A’’ water supply. The replacement is a 

new straight hose assembly and a 

separate 90-degree elbow fitting. This 

proposed AD results from a report of a 

separated hose assembly for the 

passenger water system. We are 

proposing this AD to prevent a water 

leak into the flight deck ceiling, which 

could result in an electrical short and 

possible loss of several functions 

essential to safe flight. 

DATES: We must receive comments on 

this proposed AD by March 24, 2008. 

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 AD, contact Boeing Commercial 

Airplanes, P.O. Box 3707, Seattle, 

Washington 98124–2207. 

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: 

Marcia Smith, 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) 917–6484; 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–2008–0149; Directorate Identifier 

2007–NM–319–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 a report of a 

separated hose assembly for the 

passenger water system. The hose 

assembly supplies potable water 

through a 90-degree end fitting to 

Lavatory ‘‘A.’’ The break occurred at the 

90-degree end fitting when the elbow 

separated at a soldered joint adjacent to 

the hose assembly sleeve. The break was 

located just above and inside the flight 

deck entry door, and resulted in water 

spilling into the flight deck ceiling, 

which affected various radios and the 

Aircraft Communications Addressing 

and Reporting System (ACARS) and 

caused them to become inoperative. 

These affected parts had to be replaced 

due to water damage. An analysis of the 

broken hose assembly showed signs of 

previous small leaks. It was concluded 

that an incompletely soldered joint 

failed and consequently separated. A 

broken hose assembly in this location, if 

not corrected, could leak into the flight 

deck ceiling and result in an electrical 

short and possible loss of several 

functions essential to safe flight. 

Relevant Service Information 

We have reviewed Boeing Alert 

Service Bulletin 737–38A1054, dated 

August 23, 2007. The service bulletin 

describes procedures for replacing the 

existing straight-to-90-degree hose 

assembly for the Lavatory ‘‘A’’ water 

supply. The replacement is a new 

straight hose assembly and a separate 

90-degree elbow fitting. 

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 airplanes 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 779 airplanes of U.S. 

registry. We also estimate that it would 

take between 4 and 7 work-hours per 

airplane to comply with this proposed 

AD, depending on the airplane 

configuration. The average labor rate is 

$80 per work-hour. Required parts 

would cost about $400 per product. 

Based on these figures, we estimate the 


ebenthall on PRODPC61 with PROPOSALS
Federal Register / Vol. 73, No. 27 / Friday, February 8, 2008 / Proposed Rules 7489 

cost of this proposed AD to the U.S. 

operators to be between $560,880 and 

$747,840, or between $720 and $960 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, 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: 

Boeing: Docket No. FAA–2008–0149; 

Directorate Identifier 2007–NM–319–AD. 

Comments Due Date 

(a) We must receive comments by March 

24, 2008. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to Model 737–100, 

–200, –200C, –300, –400, and –500 series 

airplanes, certificated in any category; as 

identified in Boeing Alert Service Bulletin 

737–38A1054, dated August 23, 2007. 

Unsafe Condition 

(d) This AD results from a report of a 

separated hose assembly for the passenger 

water system. We are issuing this AD to 

prevent a water leak into the flight deck 

ceiling, which could result in an electrical 

short and possible loss of several functions 

essential to safe flight. 

Compliance 

(e) Comply with this AD within the 

compliance times specified, unless already 

done. 

Replacement 

(f) Within 60 months after the effective 

date of this AD, replace the existing straightto-90-degree hose assembly for the Lavatory 

‘‘A’’ water supply with a new straight hose 

assembly and a separate 90-degree elbow 

fitting, in accordance with the 

Accomplishment Instructions of Boeing Alert 

Service Bulletin 737–38A1054, dated August 

23, 2007. 

Parts Installation 

(g) As of the effective date of this AD, any 

hose assembly part having a part number 

identified in Table 1 of this AD must not be 

used in any location that is subject to the 

requirements of this AD. However, those 

parts may be used in other locations if not 

otherwise prohibited. 

TABLE 1.—SPARE PARTS PROHIBITED FOR THIS AD 

Airplane group identified in Boeing Alert Service Bulletin 737–38A1054, 

dated August 23, 2007 Existing part Nos. 

1 and 2 ..................................................................................................... 10–61998–430, AS4471–08–0401, or AS4471–08–0404. 

3 ................................................................................................................ 10–61998–25 or 10–60871–125. 

4 ................................................................................................................ 10–61998–31 or 10–60871–139. 

Alternative Methods of Compliance 

(AMOCs) 

(h)(1) The Manager, Seattle Aircraft 

Certification Office (ACO), FAA, ATTN: 

Marcia Smith, Aerospace Engineer, Cabin 

Safety and Environmental Systems Branch, 

ANM–150S, 1601 Lind Avenue, SW., Renton, 

Washington 98057–3356; telephone (425) 

917–6484; fax (425) 917–6590; has the 

authority to approve AMOCs for this AD, if 

requested using the procedures found in 14 

CFR 39.19. 

(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 appropriate principal inspector 

(PI) in the FAA Flight Standards District 

Office (FSDO), or lacking a PI, your local 

FSDO. 

Issued in Renton, Washington, on January 

31, 2008. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. E8–2353 Filed 2–7–08; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2008–0151; Directorate 

Identifier 2007–NM–347–AD] 

RIN 2120–AA64 

Airworthiness Directives; Boeing 

Model 727 Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 


ebenthall on PRODPC61 with PROPOSALS