Document ID: FAA-2008-0730-0001
Agency: faa
Document Type: Rule
Title: Airworthiness Directives; Bombardier Model DHC-8-400, DHC-8-401, and DHC-8-402 Airplanes
Posted Date: 2008-07-02T04:00Z

[Federal Register: July 2, 2008 (Volume 73, Number 128)]
[Proposed Rules]               
[Page 37896-37898]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr02jy08-44]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0730; Directorate Identifier 2008-NM-055-AD]
RIN 2120-AA64

 
Airworthiness Directives; Bombardier Model DHC-8-400, DHC-8-401, 
and DHC-8-402 Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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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:

    All DHC-8 Series 400 aircraft have had a spoiler fuselage cable 
disconnect sensing system installed in production. Subsequently it 
was discovered that, in the event of a spoiler fuselage cable 
disconnect, only the ROLL SPLR INBD HYD caution light will be 
illuminated until the aircraft speed decreases below 165 kts 
[knots], at which time the ROLL SPLR OUTBD HYD caution light will 
also be illuminated. In the event of a spoiler fuselage cable 
disconnect in association with the existing indications described 
above, the reduction in roll authority could result in increased 
pilot workload during approach and landing.
* * * * *
    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 August 1, 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.

[[Page 37897]]

     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 W12-40, 1200 New 
Jersey Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., Monday 
through Friday, except Federal holidays.

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 
in the ADDRESSES section. Comments will be available in the AD docket 
shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Dan Parrillo, Aerospace Engineer, 
Systems and Flight Test Branch, ANE-172, FAA, New York Aircraft 
Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New 
York 11590; telephone (516) 228-7305; fax (516) 794-5531.

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-2008-0730; 
Directorate Identifier 2008-NM-055-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://
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

    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued Canadian Airworthiness Directive CF-
2008-13, dated February 14, 2008 (referred to after this as ``the 
MCAI''), to correct an unsafe condition for the specified products. The 
MCAI states:

    All DHC-8 Series 400 aircraft have had a spoiler fuselage cable 
disconnect sensing system installed in production. Subsequently it 
was discovered that, in the event of a spoiler fuselage cable 
disconnect, only the ROLL SPLR INBD HYD caution light will be 
illuminated until the aircraft speed decreases below 165 kts 
[knots], at which time the ROLL SPLR OUTBD HYD caution light will 
also be illuminated. In the event of a spoiler fuselage cable 
disconnect in association with the existing indications described 
above, the reduction in roll authority could result in increased 
pilot workload during approach and landing.
    Modsums 4-110066 and 4-126356 (each applicable to a different 
batch of aircraft serial numbers) have been issued to rework the 
sensing circuit caution light indication to ensure that it is 
consistent for spoiler fuselage cable disconnects above and below 
165 kts. Modsum 4-126356 has been installed in production on 
aircraft serial numbers 4130 and subsequent.
You may obtain further information by examining the MCAI in the AD 
docket.

Relevant Service Information

    Bombardier has issued Service Bulletin 84-27-33, dated June 6, 
2007; and Service Bulletin 84-27-28, Revision B, dated September 25, 
2007. 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 20 products of U.S. registry. We also estimate that 
it would take about 10 work-hours per product to comply with the basic 
requirements of this proposed AD. The average labor rate is $80 per 
work-hour. Required parts would cost about $2,339 per product. Where 
the service information lists required parts costs that are covered 
under warranty, we have assumed that there will be no charge for these 
costs. As we do not control warranty coverage for affected parties, 
some parties may incur costs higher than estimated here. Based on these 
figures, we estimate the cost of the proposed AD on U.S. operators to 
be $62,780, or $3,139 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

[[Page 37898]]

    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.

Sec.  39.13  [Amended]

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

Bombardier, Inc. (Formerly de Havilland, Inc.): Docket No. FAA-2008-
0730; Directorate Identifier 2008-NM-055-AD.

Comments Due Date

    (a) We must receive comments by August 1, 2008.

Affected ADs

    (b) None.

Applicability

    (c) Bombardier Model DHC-8-400, DHC-8-401 and DHC-8-402 
airplanes, serial numbers 4003, 4004, 4006, and 4008 through 4129, 
certificated in any category.

Subject

    (d) Air Transport Association (ATA) of America Code 27: Flight 
Controls.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:

    All DHC-8 Series 400 aircraft have had a spoiler fuselage cable 
disconnect sensing system installed in production. Subsequently it 
was discovered that, in the event of a spoiler fuselage cable 
disconnect, only the ROLL SPLR INBD HYD caution light will be 
illuminated until the aircraft speed decreases below 165 kts 
[knots], at which time the ROLL SPLR OUTBD HYD caution light will 
also be illuminated. In the event of a spoiler fuselage cable 
disconnect in association with the existing indications described 
above, the reduction in roll authority could result in increased 
pilot workload during approach and landing.
    Modsums 4-110066 and 4-126356 (each applicable to a different 
batch of aircraft serial numbers) have been issued to rework the 
sensing circuit caution light indication to ensure that it is 
consistent for spoiler fuselage cable disconnects above and below 
165 kts. Modsum 4-126356 has been installed in production on 
aircraft serial numbers 4130 and subsequent.

Actions and Compliance

    (f) Unless already done, do the following actions.
    (1) For airplanes with serial numbers 4003, 4004, 4006, and 4008 
through 4094: Within 6,000 flight hours after the effective date of 
this AD, modify the spoiler cable disconnect sensing circuit by 
incorporating Modsum 4-110066 in accordance with Bombardier Service 
Bulletin 84-27-33, dated June 6, 2007.
    (2) For airplanes with serial numbers 4095 through 4129: Within 
6,000 flight hours after the effective date of this AD, modify the 
spoiler cable disconnect sensing circuit by incorporating Modsum 4-
126356 in accordance with Bombardier Service Bulletin 84-27-28, 
Revision B, dated September 25, 2007.
    (3) Installations of Modsum 4-126356 accomplished before the 
effective date of this AD according to Bombardier Service Bulletin 
84-27-28, dated October 2, 2006; or Revision A, dated April 30, 
2007; are considered acceptable for compliance with the 
corresponding action specified in this AD.

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, New 
York Aircraft Certification Office (ACO), 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: Dan Parrillo, Aerospace 
Engineer, Systems and Flight Test Branch, ANE-172, FAA, New York 
ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; 
telephone (516) 228-7305; fax (516) 794-5531. 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 Canadian Airworthiness Directive CF-2008-13, 
dated February 14, 2008; and Bombardier Service Bulletins 84-27-33, 
dated June 6, 2007; and 84-27-28, Revision B, dated September 25, 
2007; for related information.

    Issued in Renton, Washington, on June 24, 2008.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E8-14964 Filed 7-1-08; 8:45 am]

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