Airworthiness Directives; BAE Systems (Operations) Limited Model BAe 146 and Model Avro 146-RJ Airplanes, 55122-55124 [E7-19197]

Download as PDF 55122 Federal Register / Vol. 72, No. 188 / Friday, September 28, 2007 / Proposed Rules 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: McCauley Propeller Systems Alert Service Bulletin No. ASB254, dated August 20, 2007. (k) Remove cracked hubs from service and any other propeller parts found cracked, and return them within 10 days after inspection to McCauley Propeller Systems, P.O. Box 7704, Wichita, KS 67277–7704, for further evaluation. McCauley Propeller Systems: Docket No. FAA–2007–29176; Directorate Identifier 2007–NE–38–AD. Comments Due Date (a) The Federal Aviation Administration (FAA) must receive comments on this airworthiness directive (AD) action by November 27, 2007. Reporting Requirements Applicability (c) This AD applies to McCauley Propeller Systems model 4HFR34C653/L106FA propellers. These propellers are installed on, but not limited to, British Aerospace Jetstream 3201 airplanes. Unsafe Condition (d) This AD results from reports of 3 hubs found cracked during propeller overhaul. We are issuing this AD to prevent failure of the propeller hub, which could cause blade separation, damage to the airplane, and loss of control of the airplane. pwalker on PROD1PC71 with PROPOSALS 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. (f) For propeller hubs with 6,000 or more operating hours time-since-new (TSN) on the effective date of this AD, perform the procedures in paragraphs (h) through (k) of this AD within 100 operating hours time-inservice (TIS) after the effective date of this AD. (g) For propeller hubs with fewer than 6,000 operating hours TSN on the effective date of this AD, perform the procedures in paragraphs (h) through (k) of this AD before the propeller hub reaches 6,100 operating hours TSN. Onetime Propeller Hub Inspection (h) Remove and disassemble the propeller, and etch the propeller hub, using paragraphs 1.A. through 2.D. of the Accomplishment Instructions of McCauley Propeller Systems Alert Service Bulletin No. ASB254, dated August 20, 2007. (i) Perform a onetime fluorescent penetrant inspection (FPI) of the propeller hub, using paragraphs 3.A through 3.G. of the Accomplishment Instructions of McCauley Propeller Systems Alert Service Bulletin No. ASB254, dated August 20, 2007. (j) For hubs that pass the FPI, perform a onetime eddy current inspection of the propeller hub, using paragraphs 4.A. through 4.F. of the Accomplishment Instructions of VerDate Aug<31>2005 18:45 Sep 27, 2007 Jkt 211001 Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2007–29337; Directorate Identifier 2007–NM–150–AD] Previous Credit (l) If you performed the onetime inspection of the propeller hub using McCauley Propeller Systems Service Bulletin No. SB238A, or Alert Service Bulletin ASB254, both dated August 20, 2007, before the effective date of this AD, you have satisfied the inspection requirements of this AD. Affected ADs (b) None. DEPARTMENT OF TRANSPORTATION (m) Record the hub inspection results on reporting form, page 8, of McCauley Alert Service Bulletin No. ASB254, dated August 20, 2007. Within 10 days after the inspection, send the completed reporting form to McCauley Propeller Systems, P.O. Box 7704, Wichita, KS 67277–7704, telephone (316) 831–4021; fax (316) 831–3858. (n) Under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq.), the Office of Management and Budget (OMB) has approved the information collection requirements contained in this AD and has assigned OMB Control Number 2120–0056. Interim Action (o) These actions are interim actions and we may take further rulemaking actions in the future. Alternative Methods of Compliance (p) The Manager, Wichita 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. Special Flight Permits (q) Under 14 CFR part 39.23, we are limiting the special flight permits for this AD by the following conditions: (1) The propeller must have no signs of external oil leakage from the hub; and (2) The propeller has no current reports of abnormal operation or vibration. Related Information (r) None. (s) Contact Jeff Janusz, Aerospace Engineer, Wichita Aircraft Certification Office, FAA, Small Airplane Directorate, 1801 Airport Road, Wichita, KS 67209; e-mail: jeff.janusz@faa.gov; telephone: (316) 946– 4148; fax: (316) 946–4107, for more information about this AD. Issued in Burlington, Massachusetts, on September 24, 2007. Thomas A. Boudreau, Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. E7–19194 Filed 9–27–07; 8:45 am] BILLING CODE 4910–13–P PO 00000 Frm 00018 Fmt 4702 Sfmt 4702 RIN 2120–AA64 Airworthiness Directives; BAE Systems (Operations) Limited Model BAe 146 and Model Avro 146–RJ Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: Corrosion has been reported beneath the heat shield which is located around the APU (auxiliary power unit) exhaust outlet. Such corrosion could result in the fuselage being unable to sustain horizontal and vertical stabiliser loads. This is considered as potentially hazardous/catastrophic. * * * The unsafe condition is that the horizontal or vertical stabilizer might collapse under excessive load, resulting in loss of control of the airplane. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI. DATES: We must receive comments on this proposed AD by October 29, 2007. ADDRESSES: You may send comments by any of the following methods: • DOT Docket Web Site: Go to http://dms.dot.gov and follow the instructions for sending your comments electronically. • 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: Room W12–140 on the ground floor of the West Building, 1200 New Jersey Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. • Federal eRulemaking Portal: http:// www.regulations.gov. Follow the instructions for submitting comments. E:\FR\FM\28SEP1.SGM 28SEP1 Federal Register / Vol. 72, No. 188 / Friday, September 28, 2007 / Proposed Rules Examining the AD Docket You may examine the AD docket on the Internet at http://dms.dot.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 in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Todd Thompson, Aerospace Engineer, International Branch, ANM–116, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98057–3356; telephone (425) 227–1175; fax (425) 227–1149. 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–2007–29337; Directorate Identifier 2007–NM–150–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 based on 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 we receive about this proposed AD. Discussion pwalker on PROD1PC71 with PROPOSALS The European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community, has issued EASA Airworthiness Directive 2007–0075, dated March 20, 2007 (referred to after this as ‘‘the MCAI’’), to correct an unsafe condition for the specified products. The MCAI states: Corrosion has been reported beneath the heat shield which is located around the APU (auxiliary power unit) exhaust outlet. Such corrosion could result in the fuselage being unable to sustain horizontal and vertical stabiliser loads. This is considered as potentially hazardous/catastrophic. This AD mandates inspections necessary to address the identified unsafe condition. The unsafe condition is that the horizontal or vertical stabilizer might collapse under excessive load, resulting VerDate Aug<31>2005 17:39 Sep 27, 2007 Jkt 211001 in loss of control of the airplane. Corrective actions include repetitive detailed visual inspections for corrosion, pitted fasteners, or pillowing of the APU heat shield and surrounding skin and, if applicable, removal of the heat shield and repair. You may obtain further information by examining the MCAI in the AD docket. Relevant Service Information BAE Systems (Operations) Limited has issued Inspection Service Bulletin ISB.53–191, dated October 25, 2006. The actions described in this service information are intended to correct the unsafe condition identified in the MCAI. FAA’s Determination and Requirements of This Proposed AD This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to our bilateral agreement with the State of Design Authority, we have been notified of the unsafe condition described in the MCAI and service information referenced above. We are proposing this AD because we evaluated all pertinent information and determined an unsafe condition exists and is likely to exist or develop on other products of the same type design. Differences Between This AD and the MCAI or Service Information We have reviewed the MCAI and related service information and, in general, agree with their substance. But we might have found it necessary to use different words from those in the MCAI to ensure the AD is clear for U.S. operators and is enforceable. In making these changes, we do not intend to differ substantively from the information provided in the MCAI and related service information. We might also have proposed different actions in this AD from those in the MCAI in order to follow FAA policies. Any such differences are highlighted in a NOTE within the proposed AD. Costs of Compliance Based on the service information, we estimate that this proposed AD would affect about 1 product of U.S. registry. We also estimate that it would take about 2 work-hours per product to comply with the basic requirements of this proposed AD. The average labor rate is $80 per work-hour. Based on these figures, we estimate the cost of the proposed AD on U.S. operators to be $160, or $160 per product. PO 00000 Frm 00019 Fmt 4702 Sfmt 4702 55123 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. We prepared a regulatory evaluation of the estimated costs to comply with this proposed AD and placed it 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. E:\FR\FM\28SEP1.SGM 28SEP1 55124 Federal Register / Vol. 72, No. 188 / Friday, September 28, 2007 / Proposed Rules FAA AD Differences DEPARTMENT OF TRANSPORTATION 2. The FAA amends § 39.13 by adding the following new AD: Federal Aviation Administration BAE Systems (Operations) Limited (Formerly British Aerospace Regional Aircraft): Docket No. FAA–2007–29337; Directorate Identifier 2007–NM–150–AD. Note: This AD differs from the MCAI and/ or service information as follows: No differences. Other FAA AD Provisions [Docket No. FAA–2007–29336; Directorate Identifier 2007–NM–143–AD] § 39.13 [Amended] Comments Due Date (a) We must receive comments by October 29, 2007. Affected ADs (b) None. Applicability (c) This AD applies to BAE Systems (Operations) Limited Model BAe 146 and Model Avro 146–RJ airplanes; certificated in any category; all models, all serial numbers. Subject (d) Air Transport Association (ATA) of America Code 53: Fuselage. Reason (e) The mandatory continuing airworthiness information (MCAI) states: Corrosion has been reported beneath the heat shield which is located around the APU (auxiliary power unit) exhaust outlet. Such corrosion could result in the fuselage being unable to sustain horizontal and vertical stabiliser loads. This is considered as potentially hazardous/catastrophic. This AD mandates inspections necessary to address the identified unsafe condition. The unsafe condition is that the horizontal or vertical stabilizer might collapse under excessive load, resulting in loss of control of the airplane. Corrective actions include repetitive detailed visual inspections for corrosion, pitted fasteners, or pillowing of the APU heat shield and surrounding skin and, if applicable, removal of the heat shield and repair. pwalker on PROD1PC71 with PROPOSALS Actions and Compliance (f) Unless already done, do the following actions. (1) Within 12 months after the effective date of this AD and thereafter at intervals not to exceed 24 months, perform a detailed visual inspection of the APU heat shield and surrounding skin, in accordance with paragraph 2.C. of BAE Systems (Operations) Limited Inspection Service Bulletin ISB.53– 191, dated October 25, 2006. (2) If any corrosion, pitted fastener, or pillowing is found during any detailed visual inspection required by paragraph (f)(1) of this AD, before the next flight, remove the APU heat shield and repair the affected area in accordance with paragraph 2.D. of BAE Systems (Operations) Limited Inspection Service Bulletin ISB.53–191, dated October 25, 2006. (3) For any airplane modified in accordance with BAE Systems (Operations) Limited Modification Service Bulletin SB.53– 193–60732A, dated November 1, 2006, the repetitive interval specified in paragraph (f)(1) of this AD may be extended to 48 months. VerDate Aug<31>2005 17:39 Sep 27, 2007 Jkt 211001 (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, International Branch, ANM–116, 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: Todd Thompson, Aerospace Engineer, International Branch, ANM–116, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98057–3356; telephone (425) 227–1175; fax (425) 227–1149. 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. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act, the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120–0056. Related Information (h) Refer to MCAI European Aviation Safety Agency Airworthiness Directive 2007– 0075, dated March 20, 2007; BAE Systems (Operations) Limited Inspection Service Bulletin ISB.53–191, dated October 25, 2006; and BAE Systems (Operations) Limited Modification Service Bulletin SB.53–193– 60732A, dated November 1, 2006; for related information. Issued in Renton, Washington, on September 21, 2007. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7–19197 Filed 9–27–07; 8:45 am] BILLING CODE 4910–13–P PO 00000 14 CFR Part 39 RIN 2120–AA64 Airworthiness Directives; Airbus Model A300, A310, and A300–600 Series Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: * * * accidents which occurred to inservice aircraft caused by the violent opening of the passenger door related to excessive residual pressure in the cabin. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI. DATES: We must receive comments on this proposed AD by October 29, 2007. ADDRESSES: You may send comments by any of the following methods: • DOT Docket Web Site: Go to http:// dms.dot.gov and follow the instructions for sending your comments electronically. • 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: Room W12–140 on the ground floor of the West Building, 1200 New Jersey Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. • Federal eRulemaking Portal: http:// www.regulations.gov. Follow the instructions for submitting comments. Examining the AD Docket You may examine the AD docket on the Internet at http://dms.dot.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 Frm 00020 Fmt 4702 Sfmt 4702 E:\FR\FM\28SEP1.SGM 28SEP1

Agencies

[Federal Register Volume 72, Number 188 (Friday, September 28, 2007)]
[Proposed Rules]
[Pages 55122-55124]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E7-19197]


-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-29337; Directorate Identifier 2007-NM-150-AD]
RIN 2120-AA64


Airworthiness Directives; BAE Systems (Operations) Limited Model 
BAe 146 and Model Avro 146-RJ Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: We propose to adopt a new airworthiness directive (AD) for the 
products listed above. This proposed AD results from mandatory 
continuing airworthiness information (MCAI) originated by an aviation 
authority of another country to identify and correct an unsafe 
condition on an aviation product. The MCAI describes the unsafe 
condition as:

    Corrosion has been reported beneath the heat shield which is 
located around the APU (auxiliary power unit) exhaust outlet. Such 
corrosion could result in the fuselage being unable to sustain 
horizontal and vertical stabiliser loads. This is considered as 
potentially hazardous/catastrophic. * * *

The unsafe condition is that the horizontal or vertical stabilizer 
might collapse under excessive load, resulting in loss of control of 
the airplane. The proposed AD would require actions that are intended 
to address the unsafe condition described in the MCAI.

DATES: We must receive comments on this proposed AD by October 29, 
2007.

ADDRESSES: You may send comments by any of the following methods:
     DOT Docket Web Site: Go to http://dms.dot.gov and follow 
the instructions for sending your comments electronically.
     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: Room W12-140 on the ground floor of the 
West Building, 1200 New Jersey Avenue, SE., Washington, DC, between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
     Federal eRulemaking Portal: http://www.regulations.gov. 
Follow the instructions for submitting comments.

[[Page 55123]]

Examining the AD Docket

    You may examine the AD docket on the Internet at http://
dms.dot.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 in the ADDRESSES 
section. Comments will be available in the AD docket shortly after 
receipt.

FOR FURTHER INFORMATION CONTACT: Todd Thompson, Aerospace Engineer, 
International Branch, ANM-116, FAA, Transport Airplane Directorate, 
1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 
227-1175; fax (425) 227-1149.

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-2007-
29337; Directorate Identifier 2007-NM-150-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 based on 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 we 
receive about this proposed AD.

Discussion

    The European Aviation Safety Agency (EASA), which is the Technical 
Agent for the Member States of the European Community, has issued EASA 
Airworthiness Directive 2007-0075, dated March 20, 2007 (referred to 
after this as ``the MCAI''), to correct an unsafe condition for the 
specified products. The MCAI states:

    Corrosion has been reported beneath the heat shield which is 
located around the APU (auxiliary power unit) exhaust outlet. Such 
corrosion could result in the fuselage being unable to sustain 
horizontal and vertical stabiliser loads. This is considered as 
potentially hazardous/catastrophic. This AD mandates inspections 
necessary to address the identified unsafe condition.

The unsafe condition is that the horizontal or vertical stabilizer 
might collapse under excessive load, resulting in loss of control of 
the airplane. Corrective actions include repetitive detailed visual 
inspections for corrosion, pitted fasteners, or pillowing of the APU 
heat shield and surrounding skin and, if applicable, removal of the 
heat shield and repair. You may obtain further information by examining 
the MCAI in the AD docket.

Relevant Service Information

    BAE Systems (Operations) Limited has issued Inspection Service 
Bulletin ISB.53-191, dated October 25, 2006. The actions described in 
this service information are intended to correct the unsafe condition 
identified in the MCAI.

FAA's Determination and Requirements of This Proposed AD

    This product has been approved by the aviation authority of another 
country, and is approved for operation in the United States. Pursuant 
to our bilateral agreement with the State of Design Authority, we have 
been notified of the unsafe condition described in the MCAI and service 
information referenced above. We are proposing this AD because we 
evaluated all pertinent information and determined an unsafe condition 
exists and is likely to exist or develop on other products of the same 
type design.

Differences Between This AD and the MCAI or Service Information

    We have reviewed the MCAI and related service information and, in 
general, agree with their substance. But we might have found it 
necessary to use different words from those in the MCAI to ensure the 
AD is clear for U.S. operators and is enforceable. In making these 
changes, we do not intend to differ substantively from the information 
provided in the MCAI and related service information.
    We might also have proposed different actions in this AD from those 
in the MCAI in order to follow FAA policies. Any such differences are 
highlighted in a NOTE within the proposed AD.

Costs of Compliance

    Based on the service information, we estimate that this proposed AD 
would affect about 1 product of U.S. registry. We also estimate that it 
would take about 2 work-hours per product to comply with the basic 
requirements of this proposed AD. The average labor rate is $80 per 
work-hour. Based on these figures, we estimate the cost of the proposed 
AD on U.S. operators to be $160, or $160 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.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this proposed AD and placed it 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.

[[Page 55124]]

Sec.  39.13  [Amended]

    2. The FAA amends Sec.  39.13 by adding the following new AD:

BAE Systems (Operations) Limited (Formerly British Aerospace 
Regional Aircraft): Docket No. FAA-2007-29337; Directorate 
Identifier 2007-NM-150-AD.

Comments Due Date

    (a) We must receive comments by October 29, 2007.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to BAE Systems (Operations) Limited Model 
BAe 146 and Model Avro 146-RJ airplanes; certificated in any 
category; all models, all serial numbers.

Subject

    (d) Air Transport Association (ATA) of America Code 53: 
Fuselage.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:
    Corrosion has been reported beneath the heat shield which is 
located around the APU (auxiliary power unit) exhaust outlet. Such 
corrosion could result in the fuselage being unable to sustain 
horizontal and vertical stabiliser loads. This is considered as 
potentially hazardous/catastrophic. This AD mandates inspections 
necessary to address the identified unsafe condition.
    The unsafe condition is that the horizontal or vertical 
stabilizer might collapse under excessive load, resulting in loss of 
control of the airplane. Corrective actions include repetitive 
detailed visual inspections for corrosion, pitted fasteners, or 
pillowing of the APU heat shield and surrounding skin and, if 
applicable, removal of the heat shield and repair.

Actions and Compliance

    (f) Unless already done, do the following actions.
    (1) Within 12 months after the effective date of this AD and 
thereafter at intervals not to exceed 24 months, perform a detailed 
visual inspection of the APU heat shield and surrounding skin, in 
accordance with paragraph 2.C. of BAE Systems (Operations) Limited 
Inspection Service Bulletin ISB.53-191, dated October 25, 2006.
    (2) If any corrosion, pitted fastener, or pillowing is found 
during any detailed visual inspection required by paragraph (f)(1) 
of this AD, before the next flight, remove the APU heat shield and 
repair the affected area in accordance with paragraph 2.D. of BAE 
Systems (Operations) Limited Inspection Service Bulletin ISB.53-191, 
dated October 25, 2006.
    (3) For any airplane modified in accordance with BAE Systems 
(Operations) Limited Modification Service Bulletin SB.53-193-60732A, 
dated November 1, 2006, the repetitive interval specified in 
paragraph (f)(1) of this AD may be extended to 48 months.

FAA AD Differences

    Note: This AD differs from the MCAI and/or service information 
as follows: No differences.

Other FAA AD Provisions

    (g) The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, 
International Branch, ANM-116, 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: Todd Thompson, Aerospace Engineer, 
International Branch, ANM-116, FAA, Transport Airplane Directorate, 
1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone 
(425) 227-1175; fax (425) 227-1149. 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.
    (2) Airworthy Product: For any requirement in this AD to obtain 
corrective actions from a manufacturer or other source, use these 
actions if they are FAA-approved. Corrective actions are considered 
FAA-approved if they are approved by the State of Design Authority 
(or their delegated agent). You are required to assure the product 
is airworthy before it is returned to service.
    (3) Reporting Requirements: For any reporting requirement in 
this AD, under the provisions of the Paperwork Reduction Act, the 
Office of Management and Budget (OMB) has approved the information 
collection requirements and has assigned OMB Control Number 2120-
0056.

Related Information

    (h) Refer to MCAI European Aviation Safety Agency Airworthiness 
Directive 2007-0075, dated March 20, 2007; BAE Systems (Operations) 
Limited Inspection Service Bulletin ISB.53-191, dated October 25, 
2006; and BAE Systems (Operations) Limited Modification Service 
Bulletin SB.53-193-60732A, dated November 1, 2006; for related 
information.

    Issued in Renton, Washington, on September 21, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E7-19197 Filed 9-27-07; 8:45 am]
BILLING CODE 4910-13-P