Federal Register / Vol. 74, No. 69 / Monday, April 13, 2009 / Proposed Rules 16811 

England Executive Park, Burlington, MA 

01803; e-mail: james.lawrence@faa.gov; 

telephone (781) 238–7176; fax (781) 238– 

7199, for more information about this AD. 

Issued in Burlington, Massachusetts, on 

April 6, 2009. 

Peter A. White, 

Assistant Manager, Engine and Propeller 

Directorate, Aircraft Certification Service. 

[FR Doc. E9–8310 Filed 4–10–09; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2009–0247; Directorate 

Identifier 2009–NE–07–AD] 

RIN 2120–AA64 

Airworthiness Directives; Hamilton 

Sundstrand Power Systems T–62T– 

46C12 Auxiliary Power Units 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

Hamilton Sundstrand Power Systems 

T–62T–46C12 auxiliary power units 

(APUs). This proposed AD would 

require upgrading the software in the 

APU full-authority digital controller 

(FADEC), from software version 

02.01.000 to version 03.00.000. This 

proposed AD results from two reports of 

APU compartment explosions due to 

over-fueling of the APU at low rpm 

during the start sequence. We are 

proposing this AD to prevent overfueling of the APU during the start 

sequence, which could lead to fuel 

explosions, injury, and damage to the 

APU and the airplane. 

DATES: We must receive any comments 

on this proposed AD by June 12, 2009. 

ADDRESSES: Use one of the following 

addresses to comment on this proposed 

AD. 

• Federal eRulemaking Portal: Go to 

http://www.regulations.gov and follow 

the instructions for sending your 

comments electronically. 

• Mail: Docket Management Facility, 

U.S. Department of Transportation, 1200 

New Jersey Avenue, SE., West Building 

Ground Floor, Room W12–140, 

Washington, DC 20590–0001. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

• Fax: (202) 493–2251. 

FOR FURTHER INFORMATION CONTACT: 

Roger Pesuit, Aerospace Engineer, Los 

Angeles Aircraft Certification Office, 

FAA, Transport Airplane Directorate, 

3960 Paramount Blvd., Lakewood, CA 

90712; e-mail: roger.pesuit@faa.gov; 

telephone (562) 627–5251, fax (562) 

627–5210. 

Contact Hamilton Sundstrand 

Technical Publications, One Hamilton 

Road, Mail Stop: 1A–3–Z63, Windsor 

Locks, CT 06096–1010; telephone (860) 

654–3575, for a copy of the service 

information identified in this proposed 

AD. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send us any written 

relevant data, views, or arguments 

regarding this proposal. Send your 

comments to an address listed under 

ADDRESSES. Include ‘‘Docket No. FAA– 

2009–0247; Directorate Identifier 2009– 

NE–07–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 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:// 

www.regulations.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 the Web 

site, anyone can find and read the 

comments in any of our dockets, 

including, if provided, 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). 

Examining the AD Docket 

You may examine the AD docket on 

the Internet at http:// 

www.regulations.gov; or in person at the 

Docket Operations office 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 Operations 

office (telephone (800) 647–5527) is the 

same as the Mail address provided in 

the ADDRESSES section. Comments will 

be available in the AD docket shortly 

after receipt. 

Discussion 

We received two reports of APU 

compartment explosions of Hamilton 

Sundstrand Power Systems T–62T– 

46C12 APUs, related to attempted start 

of the APU. In both events, the APU 

compartment was damaged, and the 

compartment doors were blown off the 

airplane. The APUs are ground 

operational only, and the airplanes were 

parked at the time of explosion. 

Investigation has revealed that the APU 

could receive an excessively rich fuel 

mixture at low rpm during the start 

sequence, due to the APU FADEC 

version 02.01.000 software, that can 

allow over-fueling of the APU during 

starting. This condition, if not corrected, 

could result in over-fueling of the APU 

during the start sequence, which could 

lead to fuel explosion, injury, and 

damage to the APU and the airplane. 

Relevant Service Information 

We have reviewed and approved the 

technical contents of Hamilton 

Sundstrand Power Systems Service 

Bulletin No. 4503067–49–12, Revision 

1, dated December 23, 2008, that 

describes procedures for upgrading the 

APU FADEC software to version 

03.00.000. This upgrade eliminates the 

potential for over-fueling the APU 

during the start sequence. 

FAA’s Determination and Requirements 

of the Proposed AD 

We have evaluated all pertinent 

information and identified an unsafe 

condition that is likely to exist or 

develop on other products of this same 

type design. We are proposing this AD, 

which would require upgrading the 

APU FADEC software to version 

03.00.000. The proposed AD would 

require you to use the service 

information described previously to 

perform these actions. 

Costs of Compliance 

We estimate that this proposed AD 

would affect 59 Hamilton Sundstrand 

Power Systems T–62T–46C12 APUs 

installed on airplanes of U.S. registry. 

We also estimate that it would take 

about three work-hours per APU to 

perform the proposed actions, and that 

the average labor rate is $80 per workhour. There is no required part cost. 

Based on these figures, we estimate the 

total cost of the proposed AD to U.S. 

operators to be $14,160. 

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, 

16812 Federal Register / Vol. 74, No. 69 / Monday, April 13, 2009 / Proposed Rules 

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 AD: 

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. Would 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. You may get a copy 

of this summary at the address listed 

under ADDRESSES. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Under the authority delegated to me 

by the Administrator, the Federal 

Aviation Administration 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: 

Hamilton Sundstrand Power Systems: 

Docket No. FAA–2009–0247; Directorate 

Identifier 2009–NE–07–AD. 

Comments Due Date 

(a) The Federal Aviation Administration 

(FAA) must receive comments on this 

airworthiness directive (AD) action by June 

12, 2009. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to Hamilton 

Sundstrand Power Systems T–62T–46C12 

auxiliary power units (APUs). These APUs 

are installed on, but not limited to, 

Bombardier Inc. DHC–8–400 series airplanes. 

Unsafe Condition 

(d) This AD results from two reports of 

APU compartment explosions due to overfueling of the APU at low rpm during the 

start sequence. We are issuing this AD to 

prevent over-fueling of the APU during the 

start sequence, which could lead to fuel 

explosion, injury, and damage to the APU 

and 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. 

Software Upgrade of the APU Full-Authority 

Digital Electronic Controller (FADEC) 

(f) At the next FADEC removal, but no later 

than 18 months after the effective date of this 

AD, upgrade the software in the APU FADEC 

from software version 02.01.000 to version 

03.00.000, and change the FADEC part 

number (P/N) from 4503069E to 4503069F. 

(g) Use paragraphs 3.A through 3.F.(2) of 

the Accomplishment Instructions of 

Hamilton Sundstrand Power Systems Service 

Bulletin No. 4503067–49–12, Revision 1, 

dated December 23, 2008, to do the software 

upgrade and the FADEC P/N change. 

Alternative Methods of Compliance 

(h) The Manager, Los Angeles Aircraft 

Certification Office, has the authority to 

approve alternative methods of compliance 

for this AD if requested using the procedures 

found in 14 CFR 39.19. 

Related Information 

(i) Contact Roger Pesuit, Aerospace 

Engineer, Los Angeles Aircraft Certification 

Office, FAA, Transport Airplane Directorate, 

3960 Paramount Blvd., Lakewood, CA 90712; 

e-mail: roger.pesuit@faa.gov; telephone (562) 

627–5251, fax (562) 627–5210, for more 

information about this AD. 

(j) Contact Hamilton Sundstrand Technical 

Publications, One Hamilton Road, Mail Stop: 

1A–3–Z63, Windsor Locks, CT 06096–1010; 

telephone (860) 654–3575, for a copy of the 

service information referenced in this AD. 

Issued in Burlington, Massachusetts, on 

April 7, 2009. 

Peter A. White, 

Assistant Manager, Engine and Propeller 

Directorate, Aircraft Certification Service. 

[FR Doc. E9–8311 Filed 4–10–09; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 71 

[Docket No. FAA–2009–0042; Airspace 

Docket No. 09–ANM–1] 

Proposed Modification of Class E 

Airspace; Montrose, CO 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking. 

SUMMARY: This action proposes to 

modify Class E airspace at Montrose 

Regional Airport, Montrose, CO. 

Additional controlled airspace is 

necessary to accommodate aircraft using 

the Instrument Landing System (ILS) 

Localizer/Distance Measuring 

Equipment (LOC/DME) Standard 

Instrument Approach Procedure (SIAP) 

at Montrose Regional Airport, Montrose, 

CO. The geographic coordinates are 

being updated to coincide with the 

FAA’s National Aeronautical Charting 

Office. The FAA is proposing this action 

to enhance the safety and management 

of aircraft operations at Montrose 

Regional Airport, Montrose, CO. 

DATES: Comments must be received on 

or before May 28, 2009. 

ADDRESSES: Send comments on this 

proposal to the U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

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

Washington, DC 20590. Telephone (202) 

366–9826. You must identify FAA 

Docket No. FAA–2009–0042; Airspace 

Docket No. 09–ANM–1, at the beginning 

of your comments. You may also submit 

comments through the Internet at 

http://www.regulations.gov. 

FOR FURTHER INFORMATION CONTACT: 

Eldon Taylor, Federal Aviation 

Administration, Operations Support 

Group, Western Service Center, 1601 

Lind Avenue, SW., Renton, WA 98057; 

telephone (425) 203–4537. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

Interested parties are invited to 

participate in this proposed rulemaking 

by submitting such written data, views, 

or arguments, as they may desire.