Federal Register / Vol. 70, No. 169 / Thursday, September 1, 2005 / Proposed Rules 52041 

APU firewall upper frame, part number 

(P/N) 145–51249–001. However, the 

service bulletins specify that the APU 

firewall upper frame may have P/N 145–

51249–001 or 120–10731–001. APU 

firewall upper frames having either part 

number are subject to the identified 

unsafe condition. Therefore, this 

proposed AD would require modifying 

the APU firewall upper frame, P/N 145–

51249–001 or 120–10731–001. 

These differences have been 

coordinated with the DAC. 

Costs of Compliance 

This proposed AD would affect about 

620 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 

$40,300, or $65 per airplane. 

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 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 and placed it in the 

AD docket. 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 Federal Aviation 

Administration (FAA) amends § 39.13 

by adding the following new 

airworthiness directive (AD): 

Empresa Brasileira de Aeronautica S.A. 

(EMBRAER): Docket No. FAA–2005–

22256; Directorate Identifier 2005–NM–

113–AD. 

Comments Due Date 

(a) The FAA must receive comments on 

this AD action by October 3, 2005. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to EMBRAER Model 

EMB–135BJ airplanes, as identified in 

EMBRAER Service Bulletin 145LEG–53–

0020, dated November 30, 2004; and Model 

EMB–135ER, –135KE, –135KL, and –135LR 

airplanes, and Model EMB–145, –145ER, 

–145MR, –145LR, –145XR, –145MP, and 

–145EP airplanes, as identified in EMBRAER 

Service Bulletin 145–53–0057, dated 

November 30, 2004; certificated in any 

category. 

Unsafe Condition 

(d) This AD results from the discovery of 

a hole in the upper frame of the firewall for 

the auxiliary power unit (APU). We are 

issuing this AD to prevent smoke from 

entering the passenger cabin in the event of 

a fire in the APU compartment. 

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. 

Modification 

(f) Within 2,500 flight hours or 365 days 

after the effective date of this AD, whichever 

occurs later, modify the APU firewall upper 

frame, part number 145–51249–001 or 120–

10731–001, in accordance with the 

Accomplishment Instructions of EMBRAER 

Service Bulletin 145LEG–53–0020 (for Model 

EMB–135BJ airplanes); or Service Bulletin 

145–53–0057 (for Model EMB–135ER, 

–135KE, –135KL, and –135LR airplanes; and 

Model EMB–145, –145ER, –145MR, –145LR, 

–145XR, –145MP, and –145EP airplanes); 

both dated November 30, 2004; as applicable. 

Alternative Methods of Compliance 

(AMOCs) 

(g) The Manager, International Branch, 

ANM–116, Transport Airplane Directorate, 

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 

(h) Brazilian airworthiness directive 2005–

04–03, dated April 30, 2005, also addresses 

the subject of this AD. 

Issued in Renton, Washington, on August 

24, 2005. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 05–17403 Filed 8–31–05; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2005–22255; Directorate 

Identifier 2005–NM–106–AD] 

RIN 2120–AA64 

Airworthiness Directives; Saab Model 

SAAB 2000 Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

certain Saab Model SAAB 2000 

airplanes. This proposed AD would 

require modifying the manual featherand-unfeather system for the propellers 

to make the design of the system more 

robust. This proposed AD results from 

reports of in-flight engine shutdown 

caused by uncommanded operation of 

the feather pump of the propeller. We 

are proposing this AD to prevent 

uncommanded feathering of the 

propeller, which could result in the 

shutdown of an engine during flight and 

consequent reduced controllability of 

the airplane. 

DATES: We must receive comments on 

this proposed AD by October 3, 2005. 

52042 Federal Register / Vol. 70, No. 169 / Thursday, September 1, 2005 / Proposed Rules 

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. 

• 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. 

Contact Saab Aircraft AB, SAAB 

Aircraft Product Support, S–581.88, 

Linko ̈ping, Sweden, for service 

information identified in this proposed 

AD. 

FOR FURTHER INFORMATION CONTACT: 

Mike Borfitz, Aerospace Engineer, 

International Branch, ANM–116, FAA, 

Transport Airplane Directorate, 1601 

Lind Avenue, SW., Renton, Washington 

98055–4056; telephone (425) 227–2677; 

fax (425) 227–1149. 

SUPPLEMENTARY INFORMATION: 

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 in the 

ADDRESSES section. Include the docket 

number ‘‘FAA–2005–22255; Directorate 

Identifier 2005–NM–106–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 received 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 may 

review the DOT’s complete Privacy Act 

Statement in the Federal Register 

published on April 11, 2000 (65 FR 

19477–78), or you may visit http:// 

dms.dot.gov. 

Examining the Docket 

You may 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 Docket 

Management System receives them. 

Discussion 

The Luftfartsstyrelsen (LFS), which is 

the airworthiness authority for Sweden, 

notified us that an unsafe condition may 

exist on certain Saab Model SAAB 2000 

airplanes. The LFS has received reports 

of in-flight engine shutdown due to 

uncommanded operation of the feather 

pump of the propeller, which caused 

the propeller to feather. The 

uncommanded activation of the feather 

pump has been attributed to an 

uncommanded operation of the remote 

control circuit breaker (RCCB) within 

the manual feather-and-unfeather 

system. This condition, if not corrected, 

could result in the shutdown of an 

engine during flight and consequent 

reduced controllability of the airplane. 

Relevant Service Information 

Saab has issued Service Bulletin 

2000–61–006, Revision 01, dated 

February 17, 2005. The service bulletin 

describes procedures for modifying the 

manual feather-and-unfeather system for 

the propellers to make the design of the 

system more robust. The modification 

involves replacing the RCCBs with 

relays, installing new wiring, and 

making associated structural 

modifications to the left and right wing 

fairings. Accomplishing the actions 

specified in the service information is 

intended to adequately address the 

unsafe condition. The LFS mandated 

the service information and issued 

Swedish airworthiness directive 1–198, 

dated February 14, 2005, to ensure the 

continued airworthiness of these 

airplanes in Sweden. 

FAA’s Determination and Requirements 

of the Proposed AD 

This airplane model is manufactured 

in Sweden and is type certificated for 

operation in the United States under the 

provisions of section 21.29 of the 

Federal Aviation Regulations (14 CFR 

21.29) and the applicable bilateral 

airworthiness agreement. Pursuant to 

this bilateral airworthiness agreement, 

the LFS has kept the FAA informed of 

the situation described above. We have 

examined the LFS’s findings, evaluated 

all pertinent information, and 

determined that we need to issue an AD 

for airplanes of this type design that are 

certificated for operation in the United 

States. 

Therefore, we are proposing this AD, 

which would require accomplishing the 

actions specified in the service 

information described previously. 

Costs of Compliance 

This proposed AD would affect about 

3 airplanes of U.S. registry. The 

proposed actions would take about 50 

work hours per airplane, at an average 

labor rate of $65 per work hour. 

Required parts would cost about 

$13,571 per airplane. Based on these 

figures, the estimated cost of the 

proposed AD for U.S. operators is 

$50,463, or $16,821 per airplane. 

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 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 

Federal Register / Vol. 70, No. 169 / Thursday, September 1, 2005 / Proposed Rules 52043 

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 and placed it in the 

AD docket. 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 Federal Aviation 

Administration (FAA) amends § 39.13 

by adding the following new 

airworthiness directive (AD): 

Saab Aircraft AB: Docket No. FAA–2005–

22255; Directorate Identifier 2005–NM–

106–AD. 

Comments Due Date 

(a) The FAA must receive comments on 

this AD action by October 3, 2005. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to SAAB Model SAAB 

2000 airplanes, certificated in any category, 

serial numbers –004 through –063 inclusive. 

Unsafe Condition 

(d) This AD results from reports of in-flight 

engine shutdown caused by uncommanded 

operation of the feather pump of the 

propeller. We are issuing this AD to prevent 

uncommanded feathering of the propeller, 

which could result in the shutdown of an 

engine during flight and consequent reduced 

controllability of the airplane. 

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. 

Modification 

(f) Within 12 months after the effective 

date of this AD, modify the manual featherand-unfeather system of the propellers by 

doing all actions specified in the 

Accomplishment Instructions of Saab Service 

Bulletin 2000–61–006, Revision 01, dated 

February 17, 2005. 

Actions Accomplished Previously 

(g) A modification accomplished before the 

effective date of this AD in accordance with 

Saab Service Bulletin 2000–61–006, dated 

December 20, 2004, is acceptable for 

compliance with paragraph (f) of this AD. 

Alternative Methods of Compliance 

(AMOCs) 

(h) The Manager, International Branch, 

ANM–116, Transport Airplane Directorate, 

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 

(i) Swedish airworthiness directive 1–198, 

dated February 14, 2005, also addresses the 

subject of this AD. 

Issued in Renton, Washington, on August 

24, 2005. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 05–17404 Filed 8–31–05; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2004–18648; Directorate 

Identifier 2004–NE–26–AD] 

RIN 2120–AA64 

Airworthiness Directives; General 

Electric Company CF34–1A, –3A, –3A1, 

–3A2, –3B, and –3B1 Series Turbofan 

Engines 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede an existing airworthiness 

directive (AD) that was issued for 

General Electric Company (GE) CF34–

3A1 and –3B1 series turbofan engines 

with certain part numbers (P/Ns) and 

serial numbers (SNs) of stage 5 low 

pressure turbine (LPT) disks and stage 6 

LPT disks. These engines are installed 

in Bombardier Canadair CL600–2B19 

Regional Jet (RJ) airplanes. This 

proposed AD would add SNs to the 

affected disk population for RJ 

airplanes. This proposed AD would also 

add GE CF34–1 and –3 series turbofan 

engines with certain P/Ns and SNs of 

stage 5 LPT disks and stage 6 LPT disks, 

to the applicability section. These 

engines are installed in Bombardier 

Canadair models CL–600–2A12 (CL–

601), CL–600–2B16 (CL–601–3A), (CL–

601–3R), and (CL–604) Business Jet (BJ) 

airplanes. This proposed AD would 

require initial and repetitive visual and 

eddy current inspections (ECI) of the 

affected disk population. This proposed 

AD would also allow replacement of 

those disks as optional terminating 

action to the repetitive inspections. 

Also, this proposed AD would require 

eventual replacement of the affected 

disks as terminating action to the 

repetitive inspections. This proposed 

AD results from the discovery of 

additional suspect stage 5 LPT disks and 

stage 6 LPT disks. These disks could fail 

due to low-cycle fatigue cracking that 

may start at the site of an electrical arcout on the disk. We are proposing this 

AD to prevent low-cycle-fatigue (LCF) 

failure of stage 5 LPT disks and stage 6 

LPT disks, which could lead to 

uncontained engine failure. 

DATES: We must receive any comments 

on this proposed AD by October 31, 

2005. 

ADDRESSES: Use one of the following 

addresses to comment 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–

0001. 

• 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. 

Contact GE Aircraft Engines, 1000 

Western Avenue, Lynn, MA 01910; 

Attention: CF34 Product Support 

Engineering, Mail Zone: 34017; 

telephone (781) 594–6323; fax (781) 

594–0600, for the service information 

identified in this proposed AD. 

FOR FURTHER INFORMATION CONTACT: Tara 

Fitzgerald, Aerospace Engineer, Engine 

Certification Office, FAA, Engine and 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803–

5299; telephone (781) 238–7130; fax 

(781) 238–7199. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments 

regarding this proposal. Send your 

comments to an address listed under 

ADDRESSES. Include ‘‘Docket No. FAA–