69842 Federal Register / Vol. 69, No. 230 / Wednesday, December 1, 2004 / Proposed Rules 

(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 a 

Boeing Company Designated Engineering 

Representative who has been authorized by 

the Manager, Seattle ACO, to make such 

findings.

Issued in Renton, Washington, on 

November 17, 2004. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service.

[FR Doc. 04–26494 Filed 11–30–04; 8:45 am] 

BILLING CODE 4910–13–P

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2004–19754; Directorate 

Identifier 2004–NM–181–AD] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier 

Model CL–600–2C10 (Regional Jet 

Series 700 & 701) Series Airplanes, and 

Model CL–600–2D24 (Regional Jet 

Series 900) Series Airplanes

AGENCY: Federal Aviation 

Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

certain Bombardier Model CL–600–

2C10 (Regional Jet Series 700 & 701) 

series airplanes, and Model CL–600–

2D24 (Regional Jet Series 900) series 

airplanes. This proposed AD would 

require revising the Airworthiness 

Limitations section of the Instructions of 

Continued Airworthiness by 

incorporating new repetitive inspections 

and an optional terminating action for 

the repetitive inspections, and would 

require repairing any crack. This 

proposed AD is prompted by reports of 

hydraulic pressure loss in either the 

number 1 or number 2 hydraulic 

systems due to breakage or leakage of 

hydraulic lines in the aft equipment bay 

and reports of cracks on the aft pressure 

bulkhead web around these feedthrough holes. We are proposing this 

AD to prevent loss of hydraulic 

pressure, which could result in reduced 

controllability of the airplane and to 

detect and correct cracks on the aft 

pressure bulkhead web, which could 

result in reduced structural integrity of 

the aft pressure bulkhead.

DATES: We must receive comments on 

this proposed AD by January 3, 2005.

ADDRESSES: Use one of the following 

addresses to submit comments on this 

proposed 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. 

• By fax: (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. 

For service information identified in 

this proposed AD, contact Bombardier, 

Inc., Canadair, Aerospace Group, P.O. 

Box 6087, Station Centre-ville, 

Montreal, Quebec H3C 3G9, Canada. 

You can examine the contents of this 

AD docket on the Internet at http://

dms.dot.gov, or in person at the Docket 

Management Facility, U.S. Department 

of Transportation, 400 Seventh Street, 

SW., room PL–401, on the plaza level of 

the Nassif Building, Washington, DC. 

This docket number is FAA–2004–

19754; the directorate identifier for this 

docket is 2004–NM–181–AD.

FOR FURTHER INFORMATION CONTACT: 

Technical information: Serge 

Napoleon, Aerospace Engineer, 

Airframe and Propulsion Branch, ANE–

171, FAA, New York Aircraft 

Certification Office, 1600 Stewart 

Avenue, suite 410, Westbury, New York 

11590; telephone (516) 228–7312; fax 

(516) 794–5531. 

Plain language information: Marcia 

Walters, marcia.walters@faa.gov.

SUPPLEMENTARY INFORMATION: 

Docket Management System (DMS) 

The FAA has implemented new 

procedures for maintaining AD dockets 

electronically. As of May 17, 2004, new 

AD actions are posted on DMS and 

assigned a docket number. We track 

each action and assign a corresponding 

directorate identifier. The DMS AD 

docket number is in the form ‘‘Docket 

No. FAA–2004–99999.’’ The Transport 

Airplane Directorate identifier is in the 

form ‘‘Directorate Identifier 2004–NM–

999–AD.’’ Each DMS AD docket also 

lists the directorate identifier (‘‘Old 

Docket Number’’) as a cross-reference 

for searching purposes. 

Comments Invited 

We invite you to submit any relevant 

written data, views, or arguments 

regarding this proposed AD. Send your 

comments to an address listed under 

ADDRESSES. Include ‘‘Docket No. FAA–

2004–19754; Directorate Identifier 

2004–NM–181–AD’’ at the beginning of 

your comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of the proposed AD. We will 

consider all comments submitted by the 

closing date and may amend the 

proposed AD in light of those 

comments. 

We will post all comments we 

receive, without change, to http://

dms.dot.gov, including any personal 

information you provide. We will also 

post a report summarizing each 

substantive verbal contact with FAA 

personnel concerning this proposed AD. 

Using the search function of our docket 

Web site, anyone can find and read the 

comments in any of our dockets, 

including the name of the individual 

who sent the comment (or signed the 

comment on behalf of an association, 

business, labor union, etc.). You can 

review the DOT’s complete Privacy Act 

Statement in the Federal Register

published on April 11, 2000 (65 FR 

19477–78), or you can visit http://

dms.dot.gov. 

We are reviewing the writing style we 

currently use in regulatory documents. 

We are interested in your comments on 

whether the style of this document is 

clear, and your suggestions to improve 

the clarity of our communications that 

affect you. You can get more 

information about plain language at 

http://www.faa.gov/language and http://

www.plainlanguage.gov. 

Examining the Docket 

You can examine the AD docket on 

the Internet at http://dms.dot.gov, or in 

person at the Docket Management 

Facility office between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. The Docket 

Management Facility office (telephone 

(800) 647–5227) is located on the plaza 

level of the Nassif Building at the DOT 

street address stated in the ADDRESSES

section. Comments will be available in 

the AD docket shortly after the DMS 

receives them. 

Discussion 

Transport Canada Civil Aviation 

(TCCA), which is the airworthiness 

authority for Canada, notified us that an 

unsafe condition may exist on certain 

Bombardier Model CL–600–2C10 

(Regional Jet Series 700 & 701) series 

airplanes, and Model CL–600–2D24 

(Regional Jet Series 900) series 

airplanes. TCCA advises that there have 

been a number of reported cases of 

Federal Register / Vol. 69, No. 230 / Wednesday, December 1, 2004 / Proposed Rules 69843

hydraulic pressure loss in either the 

number 1 or number 2 hydraulic 

systems due to breakage or leakage of 

hydraulic lines in the aft equipment 

bay. In some cases, hydraulic lines and 

connector jam nuts were found loose at 

the aft pressure bulkhead web. 

Loosening of the jam nuts also resulted 

in elongation of the affected feedthrough holes on the aft pressure 

bulkhead web at fuselage station 1098.2, 

stringers 8 and 9, left- and right-hand 

sides. In addition, cracks were found on 

the aft pressure bulkhead web around 

these feed-through holes. Loss of 

hydraulic pressure, if not corrected, 

could result in reduced controllability 

of the airplane. Cracks on the aft 

pressure bulkhead web, if not detected 

and corrected, could result in reduced 

structural integrity of the aft pressure 

bulkhead. 

Relevant Service Information 

Bombardier has issued CRJ 700/900 

Series Temporary Revision (TR) MRM2–

129, dated June 1, 2004. The TR 

describes procedures for new repetitive 

inspections of the aft pressure bulkhead 

and pylon pressure pan in the vicinity 

of the hydraulic fittings, and the 

hydraulic tube adapters. The TR also 

describes an optional terminating action 

for the repetitive inspections. 

Accomplishing the actions specified in 

the service information is intended to 

adequately address the unsafe 

condition. TCCA mandated the service 

information and issued Canadian 

airworthiness directive CF–2004–14, 

dated July 20, 2004, to ensure the 

continued airworthiness of these 

airplanes in Canada. 

FAA’s Determination and Requirements 

of the Proposed AD 

These airplane models are 

manufactured in Canada and are type 

certificated for operation in the United 

States under the provisions of § 21.29 of 

the Federal Aviation Regulations (14 

CFR 21.29) and the applicable bilateral 

airworthiness agreement. Pursuant to 

this bilateral airworthiness agreement, 

TCCA has kept the FAA informed of the 

situation described above. We have 

examined TCCA’s findings, evaluated 

all pertinent information, and 

determined that we need to issue an AD 

for products of this type design that are 

certificated for operation in the United 

States. 

Therefore, we are proposing this AD, 

which would require revising the 

Airworthiness Limitations section of the 

Instructions of Continued Airworthiness 

by incorporating new repetitive 

inspections and an optional terminating 

action for the repetitive inspections, and 

would require repairing any crack. 

Differences Between the Proposed AD 

and Canadian Airworthiness Directive 

Canadian airworthiness directive CF–

2004–14 specifies that you may contact 

the manufacturer for instructions on 

how to repair certain conditions, but 

this proposed AD would require you to 

repair those conditions using a method 

that we or TCAA (or its delegated agent) 

approve. In light of the type of repair 

that would be required to address the 

unsafe condition, and consistent with 

existing bilateral airworthiness 

agreements, we have determined that, 

for this proposed AD, a repair we or 

TCAA approve would be acceptable for 

compliance with this proposed AD. 

Costs of Compliance 

This proposed AD would affect about 

116 airplanes of U.S. registry. The 

proposed actions would take about 1 

work hour per airplane, at an average 

labor rate of $65 per work hour. Based 

on these figures, the estimated cost of 

the proposed AD for U.S. operators is 

$7,540, or $65 per airplane. 

Regulatory Findings 

We have 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 that the 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. 

We prepared a regulatory evaluation 

of the estimated costs to comply with 

this proposed AD. See the ADDRESSES

section for a location to examine the 

regulatory evaluation.

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 airworthiness 

directive (AD):

Bombardier, Inc. (Formerly Canadair):

Docket No. FAA–2004–19754; 

Directorate Identifier 2004–NM–181–AD. 

Comments Due Date 

(a) The Federal Aviation Administration 

must receive comments on this AD action by 

January 3, 2005. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to the airplanes listed 

in Table 1 of this AD, certificated in any 

category.

TABLE 1.—APPLICABILITY

Bombardier model Serial Nos. 

(1) CL–600–2C10 (Regional Jet Series 700 

& 701) series airplanes.

10003 through 10999 inclusive. 

(2) CL–600–2D24 (Regional Jet Series 900) 

series airplanes.

15001 through 15990 inclusive. 

Unsafe Condition 

(d) This AD was prompted by reports of 

hydraulic pressure loss in either the number 

1 or number 2 hydraulic systems due to 

breakage or leakage of hydraulic lines in the 

aft equipment bay and reports of cracks on 

the aft pressure bulkhead web around these 

feed-through holes. We are issuing this AD to 

prevent loss of hydraulic pressure, which 

could result in reduced controllability of the 

airplane and to detect and correct cracks on 

the aft pressure bulkhead web, which could 

result in reduced structural integrity of the 

aft pressure bulkhead. 

Compliance 

(e) You are responsible for having the 

actions required by this AD performed within 

the compliance times specified, unless the 

actions have already been done. 

Revision of Airworthiness Limitations 

Section 

(f) Within 30 days after the effective date 

of this AD, revise the Airworthiness 

Limitations section of the Instructions of 

Continued Airworthiness by inserting a copy 

of the new repetitive inspections and an 

optional terminating action of Bombardier 

CRJ 700/900 Series Temporary Revision (TR) 

MRM2–129, dated June 1, 2004, into Section 

1.4, Part 2 (Airworthiness Limitations), of 

Bombardier Regional Jet Model CL–600–2C10 

and CL–600–2D24 Maintenance 

Requirements Manual, CSP B–053. 

Thereafter, except as provided in paragraph 

(h)(2) or (i) of this AD, no alternative 

69844 Federal Register / Vol. 69, No. 230 / Wednesday, December 1, 2004 / Proposed Rules 

structural inspection intervals may be 

approved for this aft pressure bulkhead and 

pylon pressure pan in the vicinity of the 

hydraulic fittings and the hydraulic tube 

adapters. 

(g) When the information in TR MRM2–

129, dated June 1, 2004, is included in the 

general revisions of the Maintenance 

Requirement Manual, this TR may be 

removed. 

Corrective Action 

(h) If any crack is found during any 

inspection done in accordance with 

Bombardier CRJ 700/900 Series TR MRM2–

129, dated June 1, 2004, or the same 

inspection specified in the general revisions 

of the Maintenance Requirement Manual, do 

the actions specified in paragraphs (h)(1) and 

(h)(2) of this AD. 

(1) Before further flight, repair the crack in 

accordance with a method approved by 

either the Manager, New York Aircraft 

Certification Office (ACO), FAA; or Transport 

Canada Civil Aviation (TCCA) (or its 

delegated agent). 

(2) Within 30 days after repairing any crack 

in accordance with paragraph (h)(1) of this 

AD, revise the Airworthiness Limitations 

section of the Instructions of Continued 

Airworthiness by inserting a copy of the 

inspection requirements for the repair 

required by paragraph (h)(1) of this AD into 

Section 1.4, Part 2 (Airworthiness 

Limitations) of Bombardier Regional Jet 

Model CL–600–2C10 and CL–600–2D24 

Maintenance Requirements Manual, CSP B–

053. Thereafter, except as provided in 

paragraph (i) of this AD, no alternative 

structural inspection intervals may be 

approved for this aft pressure bulkhead and 

pylon pressure pan in the vicinity of the 

hydraulic fittings, and the hydraulic tube 

adapters. 

Alternative Methods of Compliance 

(AMOCs) 

(i) The Manager, New York ACO, FAA, has 

the authority to approve AMOCs for this AD, 

if requested in accordance with the 

procedures found in 14 CFR 39.19. 

Related Information 

(j) Canadian airworthiness directive CF–

2004–14, dated July 20, 2004, also addresses 

the subject of this AD.

Issued in Renton, Washington, on 

November 17, 2004. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service.

[FR Doc. 04–26493 Filed 11–30–04; 8:45 am] 

BILLING CODE 4910–13–P

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2004–19755; Directorate 

Identifier 2004–NM–23–AD] 

RIN 2120–AA64 

Airworthiness Directives; Boeing 

Model 747 Airplanes

AGENCY: Federal Aviation 

Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

certain Boeing Model 747 airplanes. 

This proposed AD would require 

repetitive tests to detect hot air leaking 

from the trim air diffuser ducts or 

sidewall riser duct assemblies 

(collectively referred to in this proposed 

AD as ‘‘TADDs’’), related investigative 

actions, and corrective actions if 

necessary. This proposed AD also 

would provide an optional terminating 

action for the repetitive tests. This 

proposed AD is prompted by reports of 

deteriorating sealants both inside and 

outside the center wing fuel tank due to 

heat damage from leaking TADDs. We 

are proposing this AD to prevent leakage 

of fuel or fuel vapors into areas where 

ignition sources may be present, which 

could result in a fire or explosion.

DATES: We must receive comments on 

this proposed AD by January 18, 2005.

ADDRESSES: Use one of the following 

addresses to submit comments on this 

proposed 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. 

• By fax: (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. 

For service information identified in 

this proposed AD, contact Boeing 

Commercial Airplanes, P.O. Box 3707, 

Seattle, Washington 98124–2207. 

You can examine the contents of this 

AD docket on the Internet at http://

dms.dot.gov, or at the Docket 

Management Facility, U.S. Department 

of Transportation, 400 Seventh Street, 

SW., room PL–401, on the plaza level of 

the Nassif Building, Washington, DC.

FOR FURTHER INFORMATION CONTACT: 

Technical information: Dan Kinney, 

Aerospace Engineer, Propulsion Branch, 

ANM–140S, FAA, Seattle Aircraft 

Certification Office, 1601 Lind Avenue, 

SW., Renton, Washington 98055–4056; 

telephone (425) 917–6499; fax (425) 

917–6590. 

Plain language information: Marcia 

Walters, marcia.walters@faa.gov.

SUPPLEMENTARY INFORMATION: 

Docket Management System (DMS) 

The FAA has implemented new 

procedures for maintaining AD dockets 

electronically. As of May 17, 2004, new 

AD actions are posted on DMS and 

assigned a docket number. We track 

each action and assign a corresponding 

directorate identifier. The DMS AD 

docket number is in the form ‘‘Docket 

No. FAA–2004–99999.’’ The Transport 

Airplane Directorate identifier is in the 

form ‘‘Directorate Identifier 2004–NM–

999–AD.’’ Each DMS AD docket also 

lists the directorate identifier (‘‘Old 

Docket Number’’) as a cross-reference 

for searching purposes.

Comments Invited 

We invite you to submit any relevant 

written data, views, or arguments 

regarding this proposed AD. Send your 

comments to an address listed under 

ADDRESSES. Include ‘‘Docket No. FAA–

2004–19755; Directorate Identifier 

2004–NM–23–AD’’ in the subject line of 

your comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of the proposed AD. We will 

consider all comments submitted by the 

closing date and may amend the 

proposed AD in light of those 

comments. 

We will post all comments we 

receive, without change, to http://

dms.dot.gov, including any personal 

information you provide. We will also 

post a report summarizing each 

substantive verbal contact with FAA 

personnel concerning this proposed AD. 

Using the search function of that Web 

site, anyone can find and read the 

comments in any of our dockets, 

including the name of the individual 

who sent the comment (or signed the 

comment on behalf of an association, 

business, labor union, etc.). You can 

review DOT’s complete Privacy Act 

Statement in the Federal Register

published on April 11, 2000 (65 FR 

19477–78), or you can visit http://

dms.dot.gov.