
[Federal Register: August 13, 2009 (Volume 74, Number 155)]
[Proposed Rules]               
[Page 40778-40781]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr13au09-17]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2009-0712; Directorate Identifier 2007-NM-152-AD]
RIN 2120-AA64

 
Airworthiness Directives; Bombardier Model DHC-8-100 and DHC-8-
200 Series Airplanes, and Model DHC-8-301, -311, and -315 Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT)

ACTION: Notice of Proposed Rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for certain Bombardier Model DHC-8-100 and DHC-8-200 series airplanes, 
and DHC-8-301, -311, and -315 airplanes. This proposed AD would require 
implementing a corrosion prevention and control program (CPCP) either 
by accomplishing specific tasks or by revising the maintenance 
inspection program to include a CPCP. This proposed AD results from the 
determination that, as airplanes age, they are more likely to exhibit 
indications of corrosion. We are proposing this AD to prevent 
structural failure of the airplane due to corrosion.

DATES: We must receive comments on this proposed AD by September 14, 
2009.

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.

[[Page 40779]]

     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: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590, 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., 400 C[ocirc]te-Vertu Road West, Dorval, Qu[eacute]bec 
H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-7401; e-mail 
thd.qseries@aero.bombardier.com; Internet http://www.bombardier.com. 
You may review copies of the referenced service information at the FAA, 
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, 
Washington. For information on the availability of this material at the 
FAA, call 425-227-1221 or 425-227-1152.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://
www.regulations.gov; or in person at the Docket Management Facility 
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 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: Pong K. Lee, Aerospace Engineer, 
Airframe and Mechanical Systems Branch, ANE-171, FAA, New York Aircraft 
Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New 
York 11590; telephone (516) 228-7324; 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-2009-0712; 
Directorate Identifier 2007-NM-152-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 because 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 we 
receive about this proposed AD.

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 DHC-8-100 and DHC-8-200 series airplanes, and 
Model DHC-8-301, -311, and -315 airplanes. TCCA advises that, as 
airplanes age, they are more likely to exhibit indications of 
corrosion. Operators must implement a Corrosion Prevention and Control 
Program (CPCP) that identifies specific areas to be inspected to 
minimize and control deterioration of the airplane from corrosion. This 
condition, if not corrected, could result in structural failure of the 
airplane.

Relevant Service Information

    Bombardier has issued Part 1, Section 3, Structural Inspection 
Program, of the following de Havilland Dash 8 Maintenance Program MRB 
(Maintenance Review Board) Reports. In this proposed AD, we refer to 
these publications as the ``manual.''
     Program Support Manual (PSM) 1-8-7, Revision 22, dated 
November 1, 2008, for Bombardier Model DHC-8-100 series airplanes.
     PSM 1-82-7, Revision 13, dated November 1, 2008, for 
Bombardier Model DHC-8-200 series airplanes.
     PSM 1-83-7, Revision 22, dated November 1, 2008, for 
Bombardier Model DHC-8-300 series airplanes.
    The manual provides a basic structural inspection schedule, which 
is intended to ensure continuous airworthiness. Only primary structures 
defined as Structurally Significant Items (SSIs) and secondary 
structures whose failure may adversely affect the systems' functions 
are included in the manual. Canadian airworthiness requirements state 
that the aircraft maintenance program must identify specific 
inspections under the CPCP. For the affected airplanes, the CPCP 
includes a complete re-analysis of the structural inspection program, 
supported by in-service engineering findings. New and revised tasks 
identified as CPCP are annotated in the manual as ED/CPCP. ED stands 
for ``environmental damage.''
    TCCA mandated the service information and issued Canadian 
Airworthiness Directive CF-2007-06, dated April 10, 2007, to ensure the 
continued airworthiness of these airplanes in Canada.

Levels of Corrosion

    The Canadian Airworthiness Directive refers to levels of corrosion. 
For the purposes of this proposed AD, the levels are defined in Part 1 
of the Bombardier (de Havilland) DHC-6 Twin Otter, Dash 7 & Dash 8 
Corrosion Prevention and Control Manual PSM 1-GEN-5, Revision 3, dated 
November 30, 1998, as follows:
     Level 1 corrosion:
    1. Occurs between repetitive inspections, is local, and can be 
reworked within certain limits; or
    2. Is local but exceeds allowable limits and is attributed to an 
event not typical of the usage of the other airplanes in the operator's 
fleet; or
    3. Exceeds allowable limits but for which only light corrosion has 
been found in previous inspections.
     Level 2 corrosion:
    1. Occurs between repetitive inspections and exceeds allowable 
limits, necessitating a repair or complete replacement of a structural 
significant element; or
    2. Occurs between repetitive inspections, is widespread, and 
requires a rework approaching allowable limits.
     Level 3 corrosion is found during initial or repetitive 
inspections and is determined to be a potentially urgent unsafe 
condition necessitating expeditious action.

FAA's Determination and Requirements of the Proposed AD

    These airplanes are manufactured in Canada and are 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, 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 airplanes of this type design that are certificated for 
operation in the United States.
    Therefore, we are proposing this AD, which would require 
implementing a CPCP either by accomplishing specific tasks or by 
revising the maintenance inspection program to include a CPCP. The 
proposed AD would require you to use the manual described previously to 
perform these actions. The proposed AD also would require you to report 
findings of Level 3 corrosion to the airplane manufacturer and to the 
FAA.

[[Page 40780]]

Costs of Compliance

    This proposed AD would affect about 154 airplanes of U.S. registry. 
There are between 16 and 17 specific inspections, depending on the 
applicable manual identified in Table 1 of this AD. The proposed 
inspections would take about 53 work hours per airplane, per inspection 
cycle, at an average labor rate of $80 per work hour. Based on these 
figures, the estimated cost of the proposed AD for U.S. operators is 
$652,960, or $4,240 per airplane, per inspection cycle.

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, Incorporation by 
reference, 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 Federal Aviation Administration (FAA) amends Sec.  39.13 by 
adding the following new airworthiness directive (AD):

Bombardier, Inc. (Formerly de Havilland, Inc.): Docket No. FAA-2009-
0712; Directorate Identifier 2007-NM-152-AD.

Comments Due Date

    (a) The FAA must receive comments on this AD action by September 
14, 2009.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Bombardier Model DHC-8-101, DHC-8-102, 
DHC-8-103, DHC-8-106, DHC-8-201, DHC-8-202, DHC-8-301, DHC-8-311, 
and DHC-8-315 airplanes, certificated in any category; serial 
numbers 003 and subsequent.

Subject

    (d) Air Transport Association (ATA) of America Codes 32: Landing 
Gear, 51: Standard Practices/Structures; 52: Doors; 53: Fuselage; 
54: Nacelles/Pylons; 55: Stabilizers; and 57: Wings.

Unsafe Condition

    (e) This AD results from the determination that, as airplanes 
age, they are more likely to exhibit indications of corrosion. We 
are issuing this AD to prevent structural failure of the airplane 
due to corrosion.

Compliance

    (f) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Manual References

    (g) This AD refers to the manuals listed in Table 1 of this AD.

                       Table 1--Applicable Manuals
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       Bombardier model                          Manual
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(1) DHC-8-101, -102, -103,     Part 1, Section 3, Structural Inspection
 and -106 airplanes.            Program, of the Dash 8 Maintenance
                                Program MRB (Maintenance Review Board)
                                Report Program Support Manual (PSM) 1-8-
                                7, Revision 22, dated November 1, 2008.
(2) DHC-8-201 and DHC-8-202    Part 1, Section 3, Structural Inspection
 airplanes.                     Program, of the Dash 8 Maintenance
                                Program MRB Report PSM 1-82-7, Revision
                                13, dated November 1, 2008.
(3) Model DHC-8-301, DHC-8-    Part 1, Section 3, Structural Inspection
 311, and DHC-8-315 airplanes.  Program, of the Dash 8 Maintenance
                                Program MRB Report PSM 1-83-7, Revision
                                22, dated November 1, 2008.
------------------------------------------------------------------------

Inspections

    (h) At the later of the times specified in paragraphs (h)(1) and 
(h)(2) of this AD, do each of the Environmental Damage/Corrosion 
Protection and Control Program (ED/CPCP) inspections, including re-
protection tasks, as applicable, in accordance with the applicable 
manual identified in Table 1 of this AD. Except as provided by 
paragraph (i) of this AD, repeat each task thereafter at intervals 
not to exceed the compliance time specified in the ``Repeat'' column 
of the applicable manual identified in Table 1 of this AD.
    (1) Within 24 months after the effective date of this AD.
    (2) At the compliance time specified in the ``Threshold'' column 
of the applicable manual identified in Table 1 of this AD since the 
date of issuance of the original Canadian airworthiness certificate 
or the date of issuance of the original Canadian export certificate 
of airworthiness. If there is no value in the ``Threshold'' column, 
use the time specified in the ``Repeat'' column.
    (i) After accomplishment of each initial ED/CPCP task required 
by paragraph (h) of this AD, the FAA may approve the incorporation 
into the operator's approved maintenance/inspection program of the 
CPCP specified in the applicable manual identified in Table 1 of 
this AD; or the equivalent program that is approved in accordance 
with this AD. In all cases, the initial corrosion task for each 
airplane area must be completed by the initial compliance time 
specified in paragraph (h) of this AD.
    (1) Any operator complying with paragraph (i) of this AD may use 
an alternative recordkeeping method to that otherwise

[[Page 40781]]

required by section 91.417 (``Maintenance records'') or section 
121.380 (``Maintenance recording requirements'') of the Federal 
Aviation Regulations (14 CFR 91.417 or 14 CFR 121.380, respectively) 
for the actions required by this AD, provided that the recordkeeping 
method is approved by the FAA and is included in a revision to the 
maintenance/inspection program. For the purposes of this paragraph, 
``the FAA'' is defined as the cognizant Principal Maintenance 
Inspector (PMI) for operators that are assigned a PMI (i.e., part 
121, 125, and 135 operators), and the cognizant Flight Standards 
District Office for other operators (i.e., part 91 operators).
    (2) After the initial accomplishment of the ED/CPCP tasks 
required by paragraph (h) of this AD, any extension of the 
repetitive intervals specified in the manual must be approved by the 
Manager, New York Aircraft Certification Office (ACO), FAA.

Corrective Actions

    (j) If any corrosion is found during accomplishment of any 
action required by paragraph (h) of this AD: Before further flight, 
rework, repair, or replace, as applicable, in accordance with a 
method approved by either the Manager, New York ACO, FAA; or 
Transport Canada Civil Aviation (TCCA) (or its delegated agent).

Reporting Requirements for Level 3 Corrosion Findings

    (k) If any Level 3 corrosion, as defined in Part 1 of the 
Bombardier (de Havilland) DHC-6 Twin Otter, Dash 7 & Dash 8 
Corrosion Prevention and Control Manual PSM 1-GEN-5, Revision 3, 
dated November 30, 1998, is found during the accomplishment of any 
action required by this AD, do paragraphs (k)(1), (k)(2), and (k)(3) 
of 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.
    (1) Within 3 days after the finding of Level 3 corrosion, report 
findings to the Manager, New York ACO, FAA, in accordance with the 
Bombardier (de Havilland) DHC-6 Twin Otter, Dash 7 & Dash 8 
Corrosion Prevention and Control Manual PSM 1-GEN-5, Revision 3, 
dated November 30, 1998.
    (2) Within 10 days after the finding of Level 3 corrosion, 
either submit a plan to the FAA to identify a schedule for 
accomplishing the applicable CPCP task on the remainder of the 
airplanes in the operator's fleet that are subject to this AD, or 
provide data substantiating that the Level 3 corrosion that was 
found is an isolated case. The FAA may impose a schedule other than 
that proposed in the plan upon finding that a change to the schedule 
is needed to ensure that any other Level 3 corrosion is detected in 
a timely manner. For the purposes of this paragraph, ``the FAA'' is 
defined as the cognizant Principal Maintenance Inspector (PMI) for 
operators that are assigned a PMI (i.e., part 121, 125, and 135 
operators), and the cognizant Flight Standards District Office for 
other operators (i.e., part 91 operators).
    (3) Within the time schedule approved in accordance with 
paragraph (k)(2) of this AD, accomplish the applicable task on the 
remainder of the airplanes in the operator's fleet that are subject 
to this AD.

Limiting Future Corrosion Findings

    (l) If corrosion findings that exceed Level 1 are found in any 
area during any repeat of any CPCP task after the initial 
accomplishment required by paragraph (h) of this AD: Within 60 days 
after such finding, implement a means approved by the FAA to reduce 
future findings of corrosion in that area to Level 1 or better. For 
the purposes of this paragraph, ``the FAA'' is defined as the 
cognizant PMI for operators that are assigned a PMI (i.e., part 121, 
125, and 135 operators), and the cognizant Flight Standards District 
Office for other operators (i.e., part 91 operators).

Scheduling Corrosion Tasks for Transferred Airplanes

    (m) Before any airplane subject to this AD is transferred and 
placed into service by an operator: Establish a schedule for 
accomplishing the CPCP tasks required by this AD in accordance with 
paragraph (m)(1) or (m)(2) of this AD, as applicable.
    (1) For airplanes on which the CPCP tasks required by this AD 
have been accomplished previously at the schedule established by 
this AD: Perform the first CPCP task in each area in accordance with 
the previous operator's schedule, or in accordance with the new 
operator's schedule, whichever results in an earlier accomplishment 
of that CPCP task. After the initial accomplishment of each CPCP 
task in each area as required by this paragraph, repeat each CPCP 
task in accordance with the new operator's schedule.
    (2) For airplanes on which the CPCP tasks required by this AD 
have not been accomplished previously, or have not been accomplished 
at the schedule established by this AD: The new operator must 
perform each initial CPCP task in each area before further flight or 
in accordance with a schedule approved by the FAA. For the purposes 
of this paragraph, ``the FAA'' is defined as the cognizant Principal 
Maintenance Inspector (PMI) for operators that are assigned a PMI 
(i.e., part 121, 125, and 135 operators), and the cognizant Flight 
Standards District Office for other operators (i.e., part 91 
operators).

Alternative Methods of Compliance (AMOCs)

    (n)(1) The Manager, New York 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: Pong K. Lee, Aerospace 
Engineer, Airframe and Mechanical Systems Branch, ANE-171, FAA, New 
York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, 
Westbury, New York 11590; telephone (516) 228-7324; fax (516) 794-
5531.
    (2) To request a different method of compliance or a different 
compliance time for this AD, follow the procedures in 14 CFR 39.19. 
Before using any approved AMOC on any airplane to which the AMOC 
applies, notify your principal maintenance inspector (PMI) or 
principal avionics inspector (PAI), as appropriate, or lacking a 
principal inspector, your local Flight Standards District Office. 
The AMOC approval letter must specifically reference this AD.

Related Information

    (o) Canadian airworthiness directive CF-2007-06, dated April 10, 
2007, also addresses the subject of this AD.

    Issued in Renton, Washington, on August 3, 2009.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E9-19420 Filed 8-12-09; 8:45 am]

BILLING CODE 4910-13-P
